Telefone+toshiba+ft 7807
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FILE NO. 2B0-9707
SERVICE MANUAL
CORDLESS TELEPHONE
FT-7807
PRINTED IN U.S.A., Oct., 1997
CONTENTS SAFETY PRECAUTIONS ..................................................................................................................... 1 OPERATING CONTROLS ................................................................................................................... 2 ALIGNMENT PROCEDURE ................................................................................................................. 3 BLOCK DIAGRAMS .............................................................................................................................. 7 SCHEMATIC DIAGRAMS ................................................................................................................... 10 TROUBLESHOOTING HINTS ........................................................................................................... 14 IC AND TRANSISTOR VOLTAGE CHART ....................................................................................... 20 SEMICONDUCTOR LEAD IDENTIFICATION ................................................................................... 25 ELECTRICAL PARTS LOCATION ..................................................................................................... 30 WIRING DIAGRAMS .......................................................................................................................... 32 EXPLODED VIEW AND MECHANICAL PARTS LIST ...................................................................... 33 PARTS LIST ........................................................................................................................................ 37 ASSEMBLY PARTS LIST ................................................................................................................... 50 SPECIFICATIONS .............................................................................................................................. 51 APPENDIX .......................................................................................................................................... 54
SAFETY PRECAUTIONS Before returning any models to the customer, a safety check of the entire instrument should be made. The service technician must be sure that no protective device built into the instrument by the manufacturer has become defective or inadvertently degraded during servicing.
1. WARNING: Alterations of the design or circuitry of these models should not be made. Any design changes or additions such as, but not limited to, circuit modifications, auxiliary speaker jacks, switches, grounding, active or passive circuitry, etc. may alter the safety characteristics of these models and potentially create a hazardous situation for the user. Any design alterations or additions will void the manufacturer’s warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting therefrom.
2. PRODUCT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special characteristics. These characteristics often pass unnoticed and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts that have these special safety characteristics are identified in this manual and its supplements; electrical components having such features are identified by a in the schematic diagram and the parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts that do not have the same safety characteristics as specified in the parts list may create shock, fire or other hazards.
—1—
OPERATING CONTROLS HANDSET CONTROLS Helical antenna Liquid Crystal Display (LCD) MEM button CID (Caller ID) button Press to enter the caller ID mode.
Number 1 button
TALK button
Used for long distance dialing.
Number 8 ( 0-9, , # Dial buttons
Number 9 (
TONE button TALK
FLASH/FUNC (Function) button Press to enter the Function Mode to perform various settings. Each time the FUNC button is pressed, the menu changes in the following order: DIAL MEMORY AREA CODE CIDCW ON\OFF AUTO TALK ON\OFF.
) button (time button)
Used to display the date and time of the received calls.
MEM
ABC
GHI
"
JKL
PQ RS
%
TUV
! $
&
WX YZ
'
(
DEF
MNO
#
FLASH
) button
) button (up arrow button)
Used to scroll up the display screen.
TONE OPER
Used to display the number of calls attempted by a caller.
CID
(
) button (down arrow button)
Used to scroll down the display screen.
CH VOL/RING RDL
FUNC DELETE CANCEL PAUSE
RDL(Redial)/PAUSE button VOL/RING/CHANCEL button Battery compartment
CH (channel)/DELETE button Charging contacts
LCD
BASE UNIT CONTROLS LINE modular jack
mem icon
talk icon
Displayed -while data is being stored in an deleted from memory. -while the Function Mode is in use.
Blinks -while the handset is connecting to the base unit. -when a channel is being changed. Displayed during a call in progress on the handset.
DC IN 9V jack Tone/Pulse switch
call id icon Blinks while the handset is connecting to the base unit. Displayed during the caller ID review mode.
Cradle
ALL DIGITAL CALLER ID CORDLESS TELEPHONE 25 CH SCANNING FT-7807
Base antenna talk
call id
mem
IN USE
Dot matrix display Twelve digits by two lines dot matrix LCD. Shows the time, caller ID, memory location, instructions, error messages, and other information. The back light of the LCD operates in the following manner: Turns on during an incoming call when the ringer is OFF. Turns on for 5 seconds and then off -when a button is pressed (except in battery low status). -when the phone rings and the handset is lifted from its cradle on the base unit to answer a call.
CHARGE
Battery icon
POWER
IN USE LED CHARGE LED POWER LED
PAGE
Displayed while the handset is being charged.
Displayed while the handset is being charged during the battery low status.
Blinks when the battery low status occurs during standby and phone conversation.
—2—
PAGE button
ALIGNMENT PROCEDURE BASE UNIT / TRANSMITTER Test Equipment Required and Connections • Oscilloscope • Frequency Counter • Digital Voltmeter
• Dummy Load, 50-ohm • AC Power Supply: 120V, 60Hz (With AC Adapter)
B a s e S e t J 2
D C IN 9 V J A C K
A C A d a p te r (1 2 0 V 6 0 H z )
R F T e s t P o in t
−
F re q u e n c y C o u n te r
D u m m y L o a d (5 0 -o h m )
+
O s c illo s c o p e
D ig ita l V o ltm e te r
T X V C O T e s t P o in t
Preset a) Set T/P SW to Pulse Mode. b) Turn on AC power while the Page key is being depressed. c) Release the Page key about 2 seconds later, then the TX Mode is entered (CH21).
Alignment Procedure Step
Adjustment
1
L10
2
Remarks Connect the oscilloscope across a 50-ohm load to RF test point. Set the digital voltmeter at the test point of TX VCO. Adjust L10 to indicate DC 2.8 ±0.05 V (VCO). Connect the frequency counter across a 50-ohm dummy load to RF test point. Make sure that the frequency is 46.770 MHz ±1500 Hz.
Alignment Point Location on Main (Base Unit) PCB T X V C O T e s t P o in t
R F T e s t P o in t L 1
L 1 0 S 1 J 2
—3—
T
P
T /P S W D C IN 9 V J a c k
RECEIVER Test Equipment Required and Connections • SG: RF Signal Generator, 49.830 MHz, 49.160 MHz • Digital Voltmeter • SINAD Meter
• Dummy Load, 600-ohm • AF SSVM
B a s e S e t
S G − +
R F T e s t P o in t
T E L J a c k
A F S S V M
D u m m y L o a d (6 0 0 -o h m )
M O D = 1 K H z D E V = ±3 k H z
D ig ita l V o ltm e te r A C A d a p te r (1 2 0 V 6 0 H Z )
S IN A D M e te r R X V C O T e s t P o in t
Preset
a) Set T/P SW to Pulse Mode. b) Turn on AC power while the Page key is being depressed. c) Release the Page key about 2 seconds later, then the TX Mode is entered (CH21). d) Press the Page key 4 times, then the RX Mode is entered (CH21).
Alignment Procedure Step
Preset to
Adjustment
1
SG: 1 mV No modulation
L7
2
3
4
SG: 1 mV 1 kHz ±3kHz deviation SG: 1 mV 1 kHz ±3 kHz deviation SG: 1 mV 1 kHz ±3 kHz deviation
L3
RT1
L6
Remarks Connect the SG to the RF test point. Connect the digital voltmeter to the test point of the RX VCO. Adjust L7 to indicate DC 1.4 ±0.05 V. Connect the digital voltmeter to the test point of Discriminator. Adjust L3 to indicate DC 2.0 ±0.05V. Adjust RT1 to make AF SSVM value −5 dBm ±0.5 dB. Set T/P SW to TONE Mode. Press the Page key once, then CH changes to CH 8. Connect the AF SSVM to the TEL LINE across a 600-ohm dummy load. Keep the SINAD reading at 12 dB by adjusting the SG output. Adjust L6 for maximum SINAD reading.
Alignment Point Location on Main (Base Unit) PCB
R F T e s t P o in t L 1 R X V C O T e s t P o in t L 7
R T 1
L 3
L 6
S 1 J 2
P T
T /P S W D C IN 9 V J a c k
D is c r im in a to r T e s t P o in t
—4—
HANDSET / TRANSMITTER Test Equipment Required and Connections • DC Power Supply, 3.6V
• Digital Voltmeter H a n d s e t R F T e s t P o in t B a tt T e r m in a l
−
D u m m y L o a d (5 0 -o h m )
F re q u e n c y C o u n te r
+
D C P o w e r S u p p ly
D ig ita l V o ltm e te r
T X V C O T e s t P o in t
3 .6 V
Preset Turn Power on while depressing “ ” and “#” keys. A beep will be heard. Then the TX Mode is entered (CH21).
Alignment Procedure Step
Adjustment
1
L509
2
Remarks Set the digital voltmeter at the test point of TX VCO, then adjust L509 to indicate DC 2.0 V ±0.05 V at CH21. Connect the frequency counter across a 50-ohm dummy load to RF test point. Make sure that the frequency is 49.830 MHz ±1500 Hz.
Alignment Point Location on Main (Handset Unit) PCB
J 5 0 1 L 5 0 4 L 5 0 9
R F T e s t P o in t
T X V C O T e s t P o in t
—5—
B a tte ry T e r m in a l
RECEIVER Test Equipment Required and Connections • SG: RF Signal Generator, 46.770 MHz, 46.610 MHz • VTVM • Digital Voltmeter
• Dummy Load, 150-ohm • DC Power Supply: 3.6 V • SINAD Meter
H a n d s e t
S G − +
M O D = 1 K H z D E V = ±3 k H z D C P o w e r S u p p ly
V T V M
D u m m y L o a d (1 5 0 -o h m )
R F T e s t S P P o in t T e r m in a l B a tt T e r m in a l
D ig ita l V o ltm e te r S IN A D M e te r
R X V C O / D is c r im in a to r T e s t P o in t
3 .6 V
S P T e r m in a l a c ro s s D u m m y L o a d
Preset a) Turn Power on while depressing “ ” and “#” keys. A beep will be heard. Then the TX Mode is entered (CH21). b) Press “4” key, then the RX ADJ Mode is entered (CH21).
Alignment Procedure Step
Preset to
Adjustment
1 2
3
4
5
6
SG: 1 mV (CH21) MOD OFF SG: 1 mV (CH21) 1 kHz ±3 kHz dev. SG: 158 µV (CH16) 1 kHz ±3 kHz dev. SG: 3 µV (CH16) 1 kHz ±3 kHz dev. SG: 1 µV (CH16) 1 kHz ±3 kHz dev.
Remarks
L505
Connect the digital voltmeter to the test point (RX VCO). Adjust for 1.4 V DC at CH21.
L502
Connect the digital voltmeter to the test point (Discriminator). Adjust for 1.1 V DC at CH21.
RT501
Connect the VTVM to the speaker terminal. Adjust for 115 mV on the VTVM (SP. OUT) at CH21.
L510
Press the “CH” twice to change the channel to CH16. Adjust for maximum SINAD on the SINAD METER at CH16.
L510
Adjust for maximum SINAD on the SINAD meter at CH16.
L510
Adjust for maximum SINAD on the SINAD meter at CH16.
Alignment Point Location on Main (Handset Unit) PCB D is c r im in a to r T e s t P o in t
L 5 1 0 S P T e r m in a l
L 5 0 2 J 5 0 1
J 5 0 2
R F T e s t P o in t R X V C O T e s t P o in t
L 5 0 5
R T 5 0 1
L 5 0 4
—6—
B a tte ry T e r m in a l
BLOCK DIAGRAMS Base
—7—
Handset
—8—
—9—
Base Unit
T E S T P O IN T (R F )
— 10 —
T E S T P O IN T (R X V C O )
C 3 2 1 0 L 1 3
T E S T P O IN T (T X V C O )
5 0 V
C 5 3 0 .1 /B
T E S T P O IN T ( D is c r im in a to r )
SCHEMATIC DIAGRAMS
1 0 0 Ê H
— 11 —
Handset Unit
T E S T P O IN T (R F )
T E S T P O IN T (R X V C O )
— 12 —
T E S T P O IN T (T X V C O )
T E S T P O IN T ( D e s c r im in a to r )
— 13 —
n th th e a l, is in 4
O K
e T E L S G is jo in e d b a s e to m a k e b e ll th e r e p u ls e w a v e o f IC 3 ?
N G
N G
N G
N G
IC 2 is d e fe c tiv e .
C h e c k IC 2 , R 3 0 a n d R 4 8 .
C h e c k T E L n e tw o rk p r im a r y c ir c u it.
O K
B y u s in g v o lta g e c h a r t, c h e c k IC 3 .
N G IC 3 is d e fe c tiv e .
S e e 2 . T h e b e ll d o e s n o t r in g & p a g e d o e s n o t r in g .
— 14 —
3. While pressing PAGE button, plug the AC power adaptor into the base. Keep pressing the PAGE button for more than 2 seconds.
2. Set the Tone/Pulse switch to "Tone" position.
1. Disconnect the AC adaptor and telephone line cord from the base. Keep the AC adaptor connected to the wall outlet. Make sure that the telephone line cord remains disconnected during this procedure.
You can cancel the Caller ID memory by the following process.
C h e c k th e s u r r o u n d in g c ir c u it w h e r e th e v o lta g e is in c o r r e c t.
O K
B y u s in g v o lta g e c h a r t, c h e c k IC 2 .
OK
T h e n , is th e r e p u ls e w a v e o n P in 2 8 o f IC 2 ?
W h e w ith s ig n o n P
OK
W h e n th e P A G E S W o f th e b a s e is p r e s s e d , d o e s th e r in g e r o n th e h a n d s e t r in g ?
1. The bell does not ring.
TROUBLESHOOTING HINTS
O K
t D IA L k e y M O D E . C a n n d b e h e a rd r?
O K
n th e P A G E S W o f th e is p r e s s e d , d o e s 3 o f IC 2 c h a n g e fro m to lo w ?
s e L K o u g e
C h e c k th e s u r r o u n d in g c ir c u it w h e r e th e v o lta g e is in c o r r e c t.
O K
B y u s in g v o lta g e c h a r t, c h e c k IC 2 .
W h e b a s e P in 5 h ig h
P re s s h a n d w h ile in T A k e y to u c h s fr o m th e r in
O K
C a n th e b a s e a n d h a n d s e t b e c o n n e c te d ?
N G
N G
N G
N G
n th e k e s e t is p u ls e o u 5 0 3 b e
y re tp s e
O K
o f th e s s e d , c a n u t a t p in 5 8 e n ?
— 15 —
R IN G E R is d e fe c tiv e .
O K
A t th e Q 5 0 7 a n d Q 5 1 2 c o lle c to r , c a n th e p u ls e w a v e b e s e e n ?
W h e h a n d th e p o f IC
C h e c k R 5 1 5 .
O K
C h e c k R X d a ta p u ls e w a v e fo r m in g c u r r e n t ( P in 1 5 o f IC 5 0 4 ) .
O K
C h e c k th e h a n d s e t R X s e n s itiv ity .
O K
C h e c k th e b a s e T X d a ta d e v ia tio n .
O K
C h e c k th e b a s e T X p o w e r.
2. The bell does not ring & page does not ring.
N G
N G
N G
N G
N G
N G
IC 2 is d e fe c tiv e .
C h e c k S 2 , R 2 7 a n d R 8 4 .
C h e c k R 5 5 6 , R 5 6 1 , R 5 6 9 , Q 5 0 7 a n d Q 5 1 2 .
C h e c k IC 5 0 3 .
C h e c k R 5 0 5 , C 5 1 1 a n d C 5 3 9 .
C h e c k th e h a n d s e t R X R F c ir c u it ( Q 5 0 1 ) a s w e ll a s F T 5 0 1 a n d F T 5 0 3 .
C h e c k R 5 3 , R 7 4 , R 7 1 , R 7 5 a n d R 7 6 .
B y u s in g v o lta g e c h a r t, c h e c k th e b a s e T X c ir c u it.
3. The base and handset cannot connect. C h e c k w h e th e r th e h a n d s e t a n d th e b a s e u n it a re c o n n e c te d .
N G
C h e c k th e b a s e T X p o w e r.
N G
B y u s in g v o lta g e c h a r t, c h e c k th e b a s e T X c ir c u it.
N G
C h e c k R 5 3 , R 7 4 , R 7 1 , R 7 5 a n d R 7 6 .
O K
O K C h e c k th e b a s e T X d a ta d e v ia tio n . O K C h e c k th e h a n d s e t R X s e n s itiv ity .
N G
O K C h e c k th e h a n d s e t R X d a ta p u ls e w a v e fo r m in g c u r r e n t ( P in 1 5 o f IC 5 0 3 ) .
N G
C h e c k th e h a n d s e t R X R F a n d m ix e r c ir c u it ( Q 5 0 1 ) a s w e ll a s F T 5 0 1 a n d F T 5 0 3 . C h e c k R 5 0 5 , C 5 1 1 a n d C 5 3 9 .
O K C h e c k R 5 1 5 . C h e c k th e h a n d s e t T X P O W E R .
N G
B y u s in g v o lta g e c h a r t, c h e c k th e h a n d s e t T X c ir c u it.
O K C h e c k th e h a n d s e t d a ta d e v ia tio n .
N G
O K
C h e c k th e h a n d s e t M IC s e n s itiv ity .
N G
O K
C h e c k th e h a n d s e t T X A F c ir c u it ( a r o u n d P in s 1 7 , 1 9 ~ 2 1 o f IC 5 0 4 ).
C h e c k th e h a n d s e t d a ta c ir c u it ( R 5 4 0 , R 5 4 1 , R 5 8 4 , a n d R 5 8 7 ).
C h e c k th e b a s e R X s e n s itiv ity .
N G
C h e c k th e b a s e R X T E L O U T . O K C h e c k th e b a s e R X R F a n d m ix e r c ir c u it ( a r o u n d Q 1 ) a s w e ll a s F T 3 a n d F T 2 .
N G
In th e s ta n d a 1 k H z in p u t s th e s in P in 2 5
b a rd 3 ig e o O K
s e m k H n a w a f IC
, w ith th e S o d u la tio n o z d e v ia tio n l o f 1 m V , c a v e b e s e e n 1 ?
G f
a n d n a t
N G
C h e c k th e b a s e IF c ir c u it ( a r o u n d P in s 2 6 ~ 2 9 o f IC 1 ) . T h e n , c a n th e s in e w a v e b e s e e n a t P in 2 4 o f IC 1 ?
N G
C h e c k c ir c u it a r o u n d P in 2 4 o f IC 1 .
O K
— 16 —
T h e n , c a n th e s in e w a v e b e s e e n a t th e Q 2 C o lle c to r .
N G
C h e c k Q 2 a n d s u r r o u n d in g c ir c u it o f Q 2 .
O K C h e c k th e s u r r o u n d in g c ir c u it o f T 1 .
4. Cannot make a phone call (pulse). C a n th e b a s e a n d h a n d s e t b e c o n n e c te d ?
N G
S e e 3 . T h e b a s e a n d h a n d s e t c a n n o t c o n n e c t.
O K W h ile in T A L K M O D E , p r e s s d ia l k e y o f th e h a n d s e t. C a n p u ls e fe e d b a c k b e h e a rd fro m th e h a n d s e t s p e a k e r?
C h e c k th e b a s e R E L A Y c o n tr o l ( a r o u n d P in 2 3 o f IC 2 .
N G
O K C h e c k th e b a s e T E L - lin e n e tw o r k p r im a r y c ir c u it.
5. Cannot make a phone call (tone). C a n th e b a s e a n d h a n d s e t b e c o n n e c te d ?
N G
S e e 3 . T h e b a s e a n d h a n d s e t c a n n o t c o n n e c t.
O K W h p re h a n s p e r in g
ile in T s s d ia l d s e t. F a k e r, d u p ?
A L k e ro o e
K M y o f m th s th
O D E , th e e e T O N E
N G
C h e c k th e b a s e m o d u la tio n s e n s itiv ity .
N G
C h e c k th e b a s e T X A F c ir c u it ( a r o u n d P in s 1 7 , 1 9 ~ 2 1 o f IC 1 ).
N G
C h e c k IC 5 b y u s in g v o lta g e c h a r t.
OK
O K C h e c k th e b a s e T E L - lin e c ir c u it a n d R E L A Y c o n tr o l c ir c u it.
A t P in 2 0 o f IC 5 o f th e b a s e , c a n th e T O N E w a v e o u tp u t b e s e e n ? O K C h e c k R 4 5 , R 4 6 , R 4 9 a n d C 5 6 .
— 17 —
6. Voice cannot be transmitted to other party (outgoing call). C h e c k th e h a n d s e t M IC s e n s itiv ity .
N G
A t th e M IC o f th e h a n d s e t, d o e s th e b ia s v o lta g e e x is t?
N G
C h e c k R 5 4 8 , R 5 3 4 , R 5 3 2 a n d C 5 5 5 .
N G
In th e s ta n d a 1 k H z in p u t s th e s in P in 2 5
O K
O K
C h e c k th e b a s e R X T E L - lin e o u t.
C h e c k th e h a n d s e t T X A F c ir c u it ( a r o u n d P in s 1 7 , 1 9 ~ 2 1 o f IC 5 0 4 ).
O K
b a rd 3 ig e o O K
s e m k H n a w a f IC
, w ith th e S o d u la tio n o z d e v ia tio n l o f 1 m V , c a v e b e s e e n 1 ?
G f
a n d n a t
N G
C h e c k th e b a s e IF c ir c u it ( a r o u n d P in s 2 6 ~ 2 9 o f IC 1 ) .
T h e n , c a n th e s in e w a v e b e s e e n a t P in 2 4 o f IC 1 ?
N G
C h e c k c ir c u it a r o u n d P in 2 4 o f IC 1 .
N G
C h e c k Q 2 a n d th e s o r r o u n d in g c ir c u it o f Q 2 .
O K T h e n , c a n th e s in e w a v e b e s e e n a t th e Q 2 c o lle c to r ? O K C h e c k th e s o r r o u n d in g c ir c u it o f T 1 .
C h e c k th e b a s e R X s e n s itiv ity . O K T h e h a n d s e t M IC is d e fe c tiv e .
N G
C h e c k th e b a s e R X T E L - lin e o u t. O K C h e c k R X R F a n d m ix e r c ir c u it o f th e b a s e ( a r o u n d Q 1 ) a s w e ll a s F T 3 a n d F T 2 .
— 18 —
N G
7. The voice of the caller cannot be heard (incoming call). C h e c k th e h a n d s e t R X S P o u t.
N G
O K
In th e s ta n d a 1 k H z in p u t s th e s in P in 2 5
h a rd 3 ig e o
n d m k H n a w a f IC
s e t, w ith th e S G o d u la tio n o f z d e v ia tio n a n d l o f 1 m V , c a n v e b e s e e n a t 5 0 4 ?
N G
C h e c k th e h a n d s e t IF c ir c u it ( a r o u n d P in s 2 6 ~ 2 9 o f IC 5 0 4 ).
N G
C h e c k c ir c u it a r o u n d P in 2 4 o f IC 5 0 4 .
N G
C h e c k a r o u n d P in s 4 4 ~ 4 6 , 5 2 o f IC 5 0 4 .
N G
T h e w ir e c o n n e c tin g th e h a n d s e t S P is c u t.
O K T h e n , c a n th e s in e w a v e b e s e e n a t P in 2 4 o f IC 5 0 4 ?
C h e c k th e h a n d s e t R X s e n s itiv ity . O K
O K
N G C h e c a n d m Q 5 0 1 F T 5 0
k th e h a n d s e t R X R F ix e r c ir c u it ( a r o u n d ) a s w e ll a s F T 5 0 1 a n d 3 .
T h e n , c a n th e s in e w a v e b e s e e n a t P in 4 6 o f IC 5 0 4 a n d C 5 1 5 ? O K T h e n , c a n th e s in e w a v e o f th e h a n d s e t S P L im it b e s e e n ? O K S P o f h a n d s e t is d e fe c tiv e .
C h e c k th e b a s e T X p o w e r.
N G
C h e c k th e b a s e T X c ir c u it u s in g v o lta g e c h a r t.
O K C h e c k th e b a s e T X m o d u la tio n s e n s itiv ity .
N G
C h e c k th e b a s e T X A F c ir c u it ( a r o u n d P in s 1 7 , 1 9 ~ 2 1 o f IC 1 ).
O K S P o f h a n d s e t is d e fe c tiv e .
— 19 —
IC AND TRANSISTOR VOLTAGE CHART Transistors Ref. No. Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q11
Q12
Q501
Q502
Unit [V]
Pin
STBY
TALK
B
0.7
0.7
C
4.8
4.6~5
E
0
0
B
1.5
1.5
C
3.2
3.2
E
0.8
B
Note
Unit [V] Ref. No. Q503
Pin
STBY
TALK 2.4~2.8
B
3.3
C
0
3~3.4
E
3.3
3.2~3.5
B
0
0.4~1.1
C
0
1.5~3.5
0.8
E
0
0
0
0.7
B
0
1.9~2.2
C
4.8
3~5.6
C
0
3~3.4
E
0
0
E
0
1.7~1.7
B
4.4
2.4
C
4.8
4.5
E
4.8
B
Q504
Q505
B
3.3
2.5~2.8
C
2
3.2~3.5
1.4~1.9
E
3.3
3.2~3.5
0.6
0.6
B
3.1
2.9~3.1
C
0
0
C
0
0
E
0
0
E
3.7
3.4~3.7
B
0
0
C
4.9
4.8~5
E
0
B
Q506
Q507
B
0
0
C
0
0
0
E
0
0
6.3
6.3
B
2.8
2.4~2.8
C
10.2
9.6~10
C
3.2
3~3.4
E
5.6
5.6
E
3.3
3.2~3.5
B
0
0.7
C
10.1
0
E
0
B
0
C
4.6
4.6
E
0
B
Q508
Q509
B
3.1
2.7~3
C
3.3
3.2~3.5
0
E
3.7
3.5~3.7
0
B
0
0
C
0
0
0
E
0
0
0.7
0.7
B
0
0
C
0
0
C
3.1
3
E
0
0
E
0
0
B
0.5
0.4~0.6
C
0
0
E
0
0
B
0
0
C
0
0
E
0
B
Q510
Q511
Q512
Q513
B
3.1
2.7~3
C
0
3.4~3.7
E
3.7
3.4~3.7
B
0.6
0.5~0.8
C
3.1
0
0
E
0
0
3.2
0.6~1
B
2
0
C
0
3.1~3.3
C
0
1.8~2.1
E
0.8
0
E
0
0
B
0
0.8~1.1
B
0
0
C
0
1.8~2.1
C
3.3
3.2~3.4
E
0
0.2~0.5
E
0
0
Q514
Q515
Q516
—20—
Note
IC’S Ref. No.
IC1
Unit [V] Pin
STBY
TALK
1
0.8~3.7
0.8~3.7
2
2.4
2.4
3
1.5
4
Note
Unit [V] Ref.
Pin
STBY
TALK
52
1.4
1.4
1
0
0
1.5
2
0
0
1.2
1
3
0
0
5
4.8
4.8
4
0
0
6
0
1.2
5
0
0
7
0
0
6
0
0
8
4.8
4.6~5.1
7
0
0
9
0~4.8
0
8
0
0
10
0~4.8
0
9
0
0
11
0~4.8
0
10
0
0
12
0
0
11
0
0
13
4.8
0
12
0
0
14
0
0
13
4.8
4.8
15
0~4.8
4.8
14
0
0
16
0
0
15
0
0
17
1.4
1.5
16
0
0
18
4.8
4.8
17
0
0
19
1.5
1.5
18
4.8
4.8
20
1.5
1.5
19
4.8
4.8
21
1.5
1.5
20
0
0
22
4.2
4.2
21
0
0
23
4.8
4.8
22
4.8
4.8
No. IC1
24
1~1.8
1.4
23
0
4.8
25
1~2.5
1.8~2.3
24
4.8
4.8
26
1
1.5
25
0
0
27
4.7~5
4.7~5
26
4.8
4.8
28
3.8~4.1
3.8~4.1
27
0
0
29
4.8
4.8
28
4.8
4.8
30
4.2
4.2
29
0
0
31
4.2
4.2
30
0
0
32
4.2
4~4.4
31
0
0
33
0
0
32
0
0
34
4.8
4.8
33
0
0
35
3.6
3.4~3.8
34
0~4.8
4.8
IC2
36
0
0
35
4.8
0
37
3.6
3.4~3.6
36
0
0
38
0
4.8
37
0
0
39
4.8
4.8
38
4.8
0
40
0.3~0.5
0.3~0.5
39
0
0
41
0.3~0.5
0.3~0.5
40
4.9
2.7
42
1.2
1.2
41
4.9
4.8
43
0
0
42
0~4.8
4.8
44
1.4
1.4
43
0
0
45
1.4
1.4
44
0
0
46
1.4
1.4
45
0
0
47
4.8
4.8
46
0
0
48
1.4
1.4
47
0~4.8
4.8
49
1.4
1.4
48
0
0
50
0
0
49
0
0
51
0
0
50
0
0
—21—
Note
Unit [V] Ref. No.
IC2
IC3
IC4
Pin
STBY
TALK
51
0
52
0
53
Pin
STBY
TALK
0
11
0.3~4.6
0.4~4.5
0
12
0
0
4.8
4.8
13
0
0
54
4.8
4.8
14
0
0
55
1.3~4.2
1.3~4.2
15
0
0
56
1.2~3.7
1.2~3.7
16
4.8
4.8
57
0
0
17
4.8
4.8
58
0
0
18
4.8
4.8
59
4.8
4.8
19
4.8
4.8
60
4.8
4.8
20
0
0
61
4.8
4.8
21
0
0
62
4.8
0
22
0
0
63
0
0
23
0
0
64
0
0
24
4.8
4.8
1
0
0
1
0
0
2
0
0
2
0
0
3
0
0
3
0
0
4
4.8
4.8
4
0
0
5
4.9
4.8-5 4.9
IC101
IC102
4.8
4.8
2
4.8
4.8
6
4.9
0
7
0
0
4.8
4.7~4.9
0
1
4.8
4.7~4.9
8
2
4.7
4.6~4.8
1
0
0
3
0
0
2
0
0
3
0
0
0.5
0.5
4
IC101
No.
1 3
IC5
Note
Unit [V] Ref.
0
0
IC103
5
0
0
4
6
0
0
1
0
0
7
0
0
2
0
0
8
0
0
3
0
0
9
0
0
4
0
0
10
4.8
4.8
5
3.3
3.3
11
0
0
6
3.3
3.3
12
0
0
7
0
0
13
0
0
8
3.3
3.2~3.5
14
0
0
1
3.3
3.2~3.4
15
0
0
2
3.3
3.1~3.6
16
0
0
3
0
0
17
0
0
1
3.3
3.3
18
0
0
2
0
0
19
0
0
3
0
0
20
2.2
2.2
4
0
0
1
2.4
2.4
5
0
0
2
2.4
2.4
6
0
0
3
2.4
2.4
7
0
0
4
2.4
2.4
8
0
0
5
2.4
2.4
9
0
0
6
0
0
10
0
0
7
0
0
11
3.3
3.3
8
0
0
12
0
0
9
0
0
13
0
0
10
1~3.6
1~3.6
14
3.3
3.3
IC501
IC502
IC503
—22—
Note
Unit [V] Ref. No.
IC503
Pin
STBY
TALK
15
1~3.3
16
0
17
Note
Unit [V] Ref.
Pin
STBY
TALK
3.3
1
3.3
3.3
0
2
0
0
3.3
3.3
3
0
0
18
0
0
4
0
0
19
3.3
3.3
5
0
0
20
0
0
6
0
0
21
0
0
7
0
0
22
0~3.3
0~3.3
8
0
0
23
0~3.3
0~3.3
9
0
0
24
0
0
10
0
0
25
0
0
11
3.3
3.3
26
0
0
12
0
0
27
0
0
13
0
0
28
0
0
14
3.3
3.3
29
0
0
15
3.2
0~3.2
30
0
0
16
0
0
31
0
0
17
3.3
3.3
No.
32
0
0
18
0
0
33
3.3
3.3
19
0
1.4~1.6
34
1~3.3
3.3
20
0
1.4~1.6
35
0
0
21
0
1.4~1.6
36
0
0
22
2.4~2.6
2.2~2.8
37
0
0
23
3.2
2.9~3.3
38
0
0
24
0.6~1.2
1.2~1.7
39
0
1
25
0~2
0.9~1.5
40
0
0
26
0.4
1.2~1.7
41
3.3
3.3
27
3.2
2.8~3.6
42
0~3.3
0~3.3
28
2.2~2.6
2~2.4
43
0
0
29
3.2
2.9~3.5
44
0~3.3
0~3.3
30
2.6
2.3~2.8
45
0~3.3
3.3
31
2.6
2.3~2.8
46
0
0
32
2.6
2.2~2.9
47
0
0
33
0
0
48
0
0
34
3.2
3~3.4 1.7~2.3
IC504
49
0
0
35
2
50
0~2.6
0
36
0
0
51
0
0
37
2
1.7~2.2
52
0
1~3.3
38
3.2
2.9~3.5
53
0
1~3.3
39
3.2
3.2
54
0
1~3.3
40
0.3~0.5
0.3~0.5
55
0
1~3.3
41
1.3~0.5
0.3~0.5
56
3.3
3.3
42
1.2~3.2
1.2~1.4
57
0
1~3.3
43
0
0
58
0
0
44
0
1.4~1.6
59
0
0~3.3
45
0
1.4~1.6
60
3.3
0
46
0
1.4~1.6
61
0
0~3.3
47
3.2
3~3.3
62
3.3
3.3
48
0
1.4~1.6
63
3.3
3.3
49
0
1.4~1.6
64
3.3
3.3
50
2.6
1.5~1.7
—23—
Note
Unit [V] Ref. No. IC504
IC505
Pin
STBY
TALK
51
0
0
52
2.5
1.4~1.6
1
0
0
2
3.6
3.4~3.8
3
3.3
3.1~3.5
4
3
2.2~2.4
5
0
0
Note
—24—
SERVICE MANUAL
CORDLESS TELEPHONE
FT-7807
PRINTED IN U.S.A., Oct., 1997
CONTENTS SAFETY PRECAUTIONS ..................................................................................................................... 1 OPERATING CONTROLS ................................................................................................................... 2 ALIGNMENT PROCEDURE ................................................................................................................. 3 BLOCK DIAGRAMS .............................................................................................................................. 7 SCHEMATIC DIAGRAMS ................................................................................................................... 10 TROUBLESHOOTING HINTS ........................................................................................................... 14 IC AND TRANSISTOR VOLTAGE CHART ....................................................................................... 20 SEMICONDUCTOR LEAD IDENTIFICATION ................................................................................... 25 ELECTRICAL PARTS LOCATION ..................................................................................................... 30 WIRING DIAGRAMS .......................................................................................................................... 32 EXPLODED VIEW AND MECHANICAL PARTS LIST ...................................................................... 33 PARTS LIST ........................................................................................................................................ 37 ASSEMBLY PARTS LIST ................................................................................................................... 50 SPECIFICATIONS .............................................................................................................................. 51 APPENDIX .......................................................................................................................................... 54
SAFETY PRECAUTIONS Before returning any models to the customer, a safety check of the entire instrument should be made. The service technician must be sure that no protective device built into the instrument by the manufacturer has become defective or inadvertently degraded during servicing.
1. WARNING: Alterations of the design or circuitry of these models should not be made. Any design changes or additions such as, but not limited to, circuit modifications, auxiliary speaker jacks, switches, grounding, active or passive circuitry, etc. may alter the safety characteristics of these models and potentially create a hazardous situation for the user. Any design alterations or additions will void the manufacturer’s warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting therefrom.
2. PRODUCT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special characteristics. These characteristics often pass unnoticed and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts that have these special safety characteristics are identified in this manual and its supplements; electrical components having such features are identified by a in the schematic diagram and the parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts that do not have the same safety characteristics as specified in the parts list may create shock, fire or other hazards.
—1—
OPERATING CONTROLS HANDSET CONTROLS Helical antenna Liquid Crystal Display (LCD) MEM button CID (Caller ID) button Press to enter the caller ID mode.
Number 1 button
TALK button
Used for long distance dialing.
Number 8 ( 0-9, , # Dial buttons
Number 9 (
TONE button TALK
FLASH/FUNC (Function) button Press to enter the Function Mode to perform various settings. Each time the FUNC button is pressed, the menu changes in the following order: DIAL MEMORY AREA CODE CIDCW ON\OFF AUTO TALK ON\OFF.
) button (time button)
Used to display the date and time of the received calls.
MEM
ABC
GHI
"
JKL
PQ RS
%
TUV
! $
&
WX YZ
'
(
DEF
MNO
#
FLASH
) button
) button (up arrow button)
Used to scroll up the display screen.
TONE OPER
Used to display the number of calls attempted by a caller.
CID
(
) button (down arrow button)
Used to scroll down the display screen.
CH VOL/RING RDL
FUNC DELETE CANCEL PAUSE
RDL(Redial)/PAUSE button VOL/RING/CHANCEL button Battery compartment
CH (channel)/DELETE button Charging contacts
LCD
BASE UNIT CONTROLS LINE modular jack
mem icon
talk icon
Displayed -while data is being stored in an deleted from memory. -while the Function Mode is in use.
Blinks -while the handset is connecting to the base unit. -when a channel is being changed. Displayed during a call in progress on the handset.
DC IN 9V jack Tone/Pulse switch
call id icon Blinks while the handset is connecting to the base unit. Displayed during the caller ID review mode.
Cradle
ALL DIGITAL CALLER ID CORDLESS TELEPHONE 25 CH SCANNING FT-7807
Base antenna talk
call id
mem
IN USE
Dot matrix display Twelve digits by two lines dot matrix LCD. Shows the time, caller ID, memory location, instructions, error messages, and other information. The back light of the LCD operates in the following manner: Turns on during an incoming call when the ringer is OFF. Turns on for 5 seconds and then off -when a button is pressed (except in battery low status). -when the phone rings and the handset is lifted from its cradle on the base unit to answer a call.
CHARGE
Battery icon
POWER
IN USE LED CHARGE LED POWER LED
PAGE
Displayed while the handset is being charged.
Displayed while the handset is being charged during the battery low status.
Blinks when the battery low status occurs during standby and phone conversation.
—2—
PAGE button
ALIGNMENT PROCEDURE BASE UNIT / TRANSMITTER Test Equipment Required and Connections • Oscilloscope • Frequency Counter • Digital Voltmeter
• Dummy Load, 50-ohm • AC Power Supply: 120V, 60Hz (With AC Adapter)
B a s e S e t J 2
D C IN 9 V J A C K
A C A d a p te r (1 2 0 V 6 0 H z )
R F T e s t P o in t
−
F re q u e n c y C o u n te r
D u m m y L o a d (5 0 -o h m )
+
O s c illo s c o p e
D ig ita l V o ltm e te r
T X V C O T e s t P o in t
Preset a) Set T/P SW to Pulse Mode. b) Turn on AC power while the Page key is being depressed. c) Release the Page key about 2 seconds later, then the TX Mode is entered (CH21).
Alignment Procedure Step
Adjustment
1
L10
2
Remarks Connect the oscilloscope across a 50-ohm load to RF test point. Set the digital voltmeter at the test point of TX VCO. Adjust L10 to indicate DC 2.8 ±0.05 V (VCO). Connect the frequency counter across a 50-ohm dummy load to RF test point. Make sure that the frequency is 46.770 MHz ±1500 Hz.
Alignment Point Location on Main (Base Unit) PCB T X V C O T e s t P o in t
R F T e s t P o in t L 1
L 1 0 S 1 J 2
—3—
T
P
T /P S W D C IN 9 V J a c k
RECEIVER Test Equipment Required and Connections • SG: RF Signal Generator, 49.830 MHz, 49.160 MHz • Digital Voltmeter • SINAD Meter
• Dummy Load, 600-ohm • AF SSVM
B a s e S e t
S G − +
R F T e s t P o in t
T E L J a c k
A F S S V M
D u m m y L o a d (6 0 0 -o h m )
M O D = 1 K H z D E V = ±3 k H z
D ig ita l V o ltm e te r A C A d a p te r (1 2 0 V 6 0 H Z )
S IN A D M e te r R X V C O T e s t P o in t
Preset
a) Set T/P SW to Pulse Mode. b) Turn on AC power while the Page key is being depressed. c) Release the Page key about 2 seconds later, then the TX Mode is entered (CH21). d) Press the Page key 4 times, then the RX Mode is entered (CH21).
Alignment Procedure Step
Preset to
Adjustment
1
SG: 1 mV No modulation
L7
2
3
4
SG: 1 mV 1 kHz ±3kHz deviation SG: 1 mV 1 kHz ±3 kHz deviation SG: 1 mV 1 kHz ±3 kHz deviation
L3
RT1
L6
Remarks Connect the SG to the RF test point. Connect the digital voltmeter to the test point of the RX VCO. Adjust L7 to indicate DC 1.4 ±0.05 V. Connect the digital voltmeter to the test point of Discriminator. Adjust L3 to indicate DC 2.0 ±0.05V. Adjust RT1 to make AF SSVM value −5 dBm ±0.5 dB. Set T/P SW to TONE Mode. Press the Page key once, then CH changes to CH 8. Connect the AF SSVM to the TEL LINE across a 600-ohm dummy load. Keep the SINAD reading at 12 dB by adjusting the SG output. Adjust L6 for maximum SINAD reading.
Alignment Point Location on Main (Base Unit) PCB
R F T e s t P o in t L 1 R X V C O T e s t P o in t L 7
R T 1
L 3
L 6
S 1 J 2
P T
T /P S W D C IN 9 V J a c k
D is c r im in a to r T e s t P o in t
—4—
HANDSET / TRANSMITTER Test Equipment Required and Connections • DC Power Supply, 3.6V
• Digital Voltmeter H a n d s e t R F T e s t P o in t B a tt T e r m in a l
−
D u m m y L o a d (5 0 -o h m )
F re q u e n c y C o u n te r
+
D C P o w e r S u p p ly
D ig ita l V o ltm e te r
T X V C O T e s t P o in t
3 .6 V
Preset Turn Power on while depressing “ ” and “#” keys. A beep will be heard. Then the TX Mode is entered (CH21).
Alignment Procedure Step
Adjustment
1
L509
2
Remarks Set the digital voltmeter at the test point of TX VCO, then adjust L509 to indicate DC 2.0 V ±0.05 V at CH21. Connect the frequency counter across a 50-ohm dummy load to RF test point. Make sure that the frequency is 49.830 MHz ±1500 Hz.
Alignment Point Location on Main (Handset Unit) PCB
J 5 0 1 L 5 0 4 L 5 0 9
R F T e s t P o in t
T X V C O T e s t P o in t
—5—
B a tte ry T e r m in a l
RECEIVER Test Equipment Required and Connections • SG: RF Signal Generator, 46.770 MHz, 46.610 MHz • VTVM • Digital Voltmeter
• Dummy Load, 150-ohm • DC Power Supply: 3.6 V • SINAD Meter
H a n d s e t
S G − +
M O D = 1 K H z D E V = ±3 k H z D C P o w e r S u p p ly
V T V M
D u m m y L o a d (1 5 0 -o h m )
R F T e s t S P P o in t T e r m in a l B a tt T e r m in a l
D ig ita l V o ltm e te r S IN A D M e te r
R X V C O / D is c r im in a to r T e s t P o in t
3 .6 V
S P T e r m in a l a c ro s s D u m m y L o a d
Preset a) Turn Power on while depressing “ ” and “#” keys. A beep will be heard. Then the TX Mode is entered (CH21). b) Press “4” key, then the RX ADJ Mode is entered (CH21).
Alignment Procedure Step
Preset to
Adjustment
1 2
3
4
5
6
SG: 1 mV (CH21) MOD OFF SG: 1 mV (CH21) 1 kHz ±3 kHz dev. SG: 158 µV (CH16) 1 kHz ±3 kHz dev. SG: 3 µV (CH16) 1 kHz ±3 kHz dev. SG: 1 µV (CH16) 1 kHz ±3 kHz dev.
Remarks
L505
Connect the digital voltmeter to the test point (RX VCO). Adjust for 1.4 V DC at CH21.
L502
Connect the digital voltmeter to the test point (Discriminator). Adjust for 1.1 V DC at CH21.
RT501
Connect the VTVM to the speaker terminal. Adjust for 115 mV on the VTVM (SP. OUT) at CH21.
L510
Press the “CH” twice to change the channel to CH16. Adjust for maximum SINAD on the SINAD METER at CH16.
L510
Adjust for maximum SINAD on the SINAD meter at CH16.
L510
Adjust for maximum SINAD on the SINAD meter at CH16.
Alignment Point Location on Main (Handset Unit) PCB D is c r im in a to r T e s t P o in t
L 5 1 0 S P T e r m in a l
L 5 0 2 J 5 0 1
J 5 0 2
R F T e s t P o in t R X V C O T e s t P o in t
L 5 0 5
R T 5 0 1
L 5 0 4
—6—
B a tte ry T e r m in a l
BLOCK DIAGRAMS Base
—7—
Handset
—8—
—9—
Base Unit
T E S T P O IN T (R F )
— 10 —
T E S T P O IN T (R X V C O )
C 3 2 1 0 L 1 3
T E S T P O IN T (T X V C O )
5 0 V
C 5 3 0 .1 /B
T E S T P O IN T ( D is c r im in a to r )
SCHEMATIC DIAGRAMS
1 0 0 Ê H
— 11 —
Handset Unit
T E S T P O IN T (R F )
T E S T P O IN T (R X V C O )
— 12 —
T E S T P O IN T (T X V C O )
T E S T P O IN T ( D e s c r im in a to r )
— 13 —
n th th e a l, is in 4
O K
e T E L S G is jo in e d b a s e to m a k e b e ll th e r e p u ls e w a v e o f IC 3 ?
N G
N G
N G
N G
IC 2 is d e fe c tiv e .
C h e c k IC 2 , R 3 0 a n d R 4 8 .
C h e c k T E L n e tw o rk p r im a r y c ir c u it.
O K
B y u s in g v o lta g e c h a r t, c h e c k IC 3 .
N G IC 3 is d e fe c tiv e .
S e e 2 . T h e b e ll d o e s n o t r in g & p a g e d o e s n o t r in g .
— 14 —
3. While pressing PAGE button, plug the AC power adaptor into the base. Keep pressing the PAGE button for more than 2 seconds.
2. Set the Tone/Pulse switch to "Tone" position.
1. Disconnect the AC adaptor and telephone line cord from the base. Keep the AC adaptor connected to the wall outlet. Make sure that the telephone line cord remains disconnected during this procedure.
You can cancel the Caller ID memory by the following process.
C h e c k th e s u r r o u n d in g c ir c u it w h e r e th e v o lta g e is in c o r r e c t.
O K
B y u s in g v o lta g e c h a r t, c h e c k IC 2 .
OK
T h e n , is th e r e p u ls e w a v e o n P in 2 8 o f IC 2 ?
W h e w ith s ig n o n P
OK
W h e n th e P A G E S W o f th e b a s e is p r e s s e d , d o e s th e r in g e r o n th e h a n d s e t r in g ?
1. The bell does not ring.
TROUBLESHOOTING HINTS
O K
t D IA L k e y M O D E . C a n n d b e h e a rd r?
O K
n th e P A G E S W o f th e is p r e s s e d , d o e s 3 o f IC 2 c h a n g e fro m to lo w ?
s e L K o u g e
C h e c k th e s u r r o u n d in g c ir c u it w h e r e th e v o lta g e is in c o r r e c t.
O K
B y u s in g v o lta g e c h a r t, c h e c k IC 2 .
W h e b a s e P in 5 h ig h
P re s s h a n d w h ile in T A k e y to u c h s fr o m th e r in
O K
C a n th e b a s e a n d h a n d s e t b e c o n n e c te d ?
N G
N G
N G
N G
n th e k e s e t is p u ls e o u 5 0 3 b e
y re tp s e
O K
o f th e s s e d , c a n u t a t p in 5 8 e n ?
— 15 —
R IN G E R is d e fe c tiv e .
O K
A t th e Q 5 0 7 a n d Q 5 1 2 c o lle c to r , c a n th e p u ls e w a v e b e s e e n ?
W h e h a n d th e p o f IC
C h e c k R 5 1 5 .
O K
C h e c k R X d a ta p u ls e w a v e fo r m in g c u r r e n t ( P in 1 5 o f IC 5 0 4 ) .
O K
C h e c k th e h a n d s e t R X s e n s itiv ity .
O K
C h e c k th e b a s e T X d a ta d e v ia tio n .
O K
C h e c k th e b a s e T X p o w e r.
2. The bell does not ring & page does not ring.
N G
N G
N G
N G
N G
N G
IC 2 is d e fe c tiv e .
C h e c k S 2 , R 2 7 a n d R 8 4 .
C h e c k R 5 5 6 , R 5 6 1 , R 5 6 9 , Q 5 0 7 a n d Q 5 1 2 .
C h e c k IC 5 0 3 .
C h e c k R 5 0 5 , C 5 1 1 a n d C 5 3 9 .
C h e c k th e h a n d s e t R X R F c ir c u it ( Q 5 0 1 ) a s w e ll a s F T 5 0 1 a n d F T 5 0 3 .
C h e c k R 5 3 , R 7 4 , R 7 1 , R 7 5 a n d R 7 6 .
B y u s in g v o lta g e c h a r t, c h e c k th e b a s e T X c ir c u it.
3. The base and handset cannot connect. C h e c k w h e th e r th e h a n d s e t a n d th e b a s e u n it a re c o n n e c te d .
N G
C h e c k th e b a s e T X p o w e r.
N G
B y u s in g v o lta g e c h a r t, c h e c k th e b a s e T X c ir c u it.
N G
C h e c k R 5 3 , R 7 4 , R 7 1 , R 7 5 a n d R 7 6 .
O K
O K C h e c k th e b a s e T X d a ta d e v ia tio n . O K C h e c k th e h a n d s e t R X s e n s itiv ity .
N G
O K C h e c k th e h a n d s e t R X d a ta p u ls e w a v e fo r m in g c u r r e n t ( P in 1 5 o f IC 5 0 3 ) .
N G
C h e c k th e h a n d s e t R X R F a n d m ix e r c ir c u it ( Q 5 0 1 ) a s w e ll a s F T 5 0 1 a n d F T 5 0 3 . C h e c k R 5 0 5 , C 5 1 1 a n d C 5 3 9 .
O K C h e c k R 5 1 5 . C h e c k th e h a n d s e t T X P O W E R .
N G
B y u s in g v o lta g e c h a r t, c h e c k th e h a n d s e t T X c ir c u it.
O K C h e c k th e h a n d s e t d a ta d e v ia tio n .
N G
O K
C h e c k th e h a n d s e t M IC s e n s itiv ity .
N G
O K
C h e c k th e h a n d s e t T X A F c ir c u it ( a r o u n d P in s 1 7 , 1 9 ~ 2 1 o f IC 5 0 4 ).
C h e c k th e h a n d s e t d a ta c ir c u it ( R 5 4 0 , R 5 4 1 , R 5 8 4 , a n d R 5 8 7 ).
C h e c k th e b a s e R X s e n s itiv ity .
N G
C h e c k th e b a s e R X T E L O U T . O K C h e c k th e b a s e R X R F a n d m ix e r c ir c u it ( a r o u n d Q 1 ) a s w e ll a s F T 3 a n d F T 2 .
N G
In th e s ta n d a 1 k H z in p u t s th e s in P in 2 5
b a rd 3 ig e o O K
s e m k H n a w a f IC
, w ith th e S o d u la tio n o z d e v ia tio n l o f 1 m V , c a v e b e s e e n 1 ?
G f
a n d n a t
N G
C h e c k th e b a s e IF c ir c u it ( a r o u n d P in s 2 6 ~ 2 9 o f IC 1 ) . T h e n , c a n th e s in e w a v e b e s e e n a t P in 2 4 o f IC 1 ?
N G
C h e c k c ir c u it a r o u n d P in 2 4 o f IC 1 .
O K
— 16 —
T h e n , c a n th e s in e w a v e b e s e e n a t th e Q 2 C o lle c to r .
N G
C h e c k Q 2 a n d s u r r o u n d in g c ir c u it o f Q 2 .
O K C h e c k th e s u r r o u n d in g c ir c u it o f T 1 .
4. Cannot make a phone call (pulse). C a n th e b a s e a n d h a n d s e t b e c o n n e c te d ?
N G
S e e 3 . T h e b a s e a n d h a n d s e t c a n n o t c o n n e c t.
O K W h ile in T A L K M O D E , p r e s s d ia l k e y o f th e h a n d s e t. C a n p u ls e fe e d b a c k b e h e a rd fro m th e h a n d s e t s p e a k e r?
C h e c k th e b a s e R E L A Y c o n tr o l ( a r o u n d P in 2 3 o f IC 2 .
N G
O K C h e c k th e b a s e T E L - lin e n e tw o r k p r im a r y c ir c u it.
5. Cannot make a phone call (tone). C a n th e b a s e a n d h a n d s e t b e c o n n e c te d ?
N G
S e e 3 . T h e b a s e a n d h a n d s e t c a n n o t c o n n e c t.
O K W h p re h a n s p e r in g
ile in T s s d ia l d s e t. F a k e r, d u p ?
A L k e ro o e
K M y o f m th s th
O D E , th e e e T O N E
N G
C h e c k th e b a s e m o d u la tio n s e n s itiv ity .
N G
C h e c k th e b a s e T X A F c ir c u it ( a r o u n d P in s 1 7 , 1 9 ~ 2 1 o f IC 1 ).
N G
C h e c k IC 5 b y u s in g v o lta g e c h a r t.
OK
O K C h e c k th e b a s e T E L - lin e c ir c u it a n d R E L A Y c o n tr o l c ir c u it.
A t P in 2 0 o f IC 5 o f th e b a s e , c a n th e T O N E w a v e o u tp u t b e s e e n ? O K C h e c k R 4 5 , R 4 6 , R 4 9 a n d C 5 6 .
— 17 —
6. Voice cannot be transmitted to other party (outgoing call). C h e c k th e h a n d s e t M IC s e n s itiv ity .
N G
A t th e M IC o f th e h a n d s e t, d o e s th e b ia s v o lta g e e x is t?
N G
C h e c k R 5 4 8 , R 5 3 4 , R 5 3 2 a n d C 5 5 5 .
N G
In th e s ta n d a 1 k H z in p u t s th e s in P in 2 5
O K
O K
C h e c k th e b a s e R X T E L - lin e o u t.
C h e c k th e h a n d s e t T X A F c ir c u it ( a r o u n d P in s 1 7 , 1 9 ~ 2 1 o f IC 5 0 4 ).
O K
b a rd 3 ig e o O K
s e m k H n a w a f IC
, w ith th e S o d u la tio n o z d e v ia tio n l o f 1 m V , c a v e b e s e e n 1 ?
G f
a n d n a t
N G
C h e c k th e b a s e IF c ir c u it ( a r o u n d P in s 2 6 ~ 2 9 o f IC 1 ) .
T h e n , c a n th e s in e w a v e b e s e e n a t P in 2 4 o f IC 1 ?
N G
C h e c k c ir c u it a r o u n d P in 2 4 o f IC 1 .
N G
C h e c k Q 2 a n d th e s o r r o u n d in g c ir c u it o f Q 2 .
O K T h e n , c a n th e s in e w a v e b e s e e n a t th e Q 2 c o lle c to r ? O K C h e c k th e s o r r o u n d in g c ir c u it o f T 1 .
C h e c k th e b a s e R X s e n s itiv ity . O K T h e h a n d s e t M IC is d e fe c tiv e .
N G
C h e c k th e b a s e R X T E L - lin e o u t. O K C h e c k R X R F a n d m ix e r c ir c u it o f th e b a s e ( a r o u n d Q 1 ) a s w e ll a s F T 3 a n d F T 2 .
— 18 —
N G
7. The voice of the caller cannot be heard (incoming call). C h e c k th e h a n d s e t R X S P o u t.
N G
O K
In th e s ta n d a 1 k H z in p u t s th e s in P in 2 5
h a rd 3 ig e o
n d m k H n a w a f IC
s e t, w ith th e S G o d u la tio n o f z d e v ia tio n a n d l o f 1 m V , c a n v e b e s e e n a t 5 0 4 ?
N G
C h e c k th e h a n d s e t IF c ir c u it ( a r o u n d P in s 2 6 ~ 2 9 o f IC 5 0 4 ).
N G
C h e c k c ir c u it a r o u n d P in 2 4 o f IC 5 0 4 .
N G
C h e c k a r o u n d P in s 4 4 ~ 4 6 , 5 2 o f IC 5 0 4 .
N G
T h e w ir e c o n n e c tin g th e h a n d s e t S P is c u t.
O K T h e n , c a n th e s in e w a v e b e s e e n a t P in 2 4 o f IC 5 0 4 ?
C h e c k th e h a n d s e t R X s e n s itiv ity . O K
O K
N G C h e c a n d m Q 5 0 1 F T 5 0
k th e h a n d s e t R X R F ix e r c ir c u it ( a r o u n d ) a s w e ll a s F T 5 0 1 a n d 3 .
T h e n , c a n th e s in e w a v e b e s e e n a t P in 4 6 o f IC 5 0 4 a n d C 5 1 5 ? O K T h e n , c a n th e s in e w a v e o f th e h a n d s e t S P L im it b e s e e n ? O K S P o f h a n d s e t is d e fe c tiv e .
C h e c k th e b a s e T X p o w e r.
N G
C h e c k th e b a s e T X c ir c u it u s in g v o lta g e c h a r t.
O K C h e c k th e b a s e T X m o d u la tio n s e n s itiv ity .
N G
C h e c k th e b a s e T X A F c ir c u it ( a r o u n d P in s 1 7 , 1 9 ~ 2 1 o f IC 1 ).
O K S P o f h a n d s e t is d e fe c tiv e .
— 19 —
IC AND TRANSISTOR VOLTAGE CHART Transistors Ref. No. Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q11
Q12
Q501
Q502
Unit [V]
Pin
STBY
TALK
B
0.7
0.7
C
4.8
4.6~5
E
0
0
B
1.5
1.5
C
3.2
3.2
E
0.8
B
Note
Unit [V] Ref. No. Q503
Pin
STBY
TALK 2.4~2.8
B
3.3
C
0
3~3.4
E
3.3
3.2~3.5
B
0
0.4~1.1
C
0
1.5~3.5
0.8
E
0
0
0
0.7
B
0
1.9~2.2
C
4.8
3~5.6
C
0
3~3.4
E
0
0
E
0
1.7~1.7
B
4.4
2.4
C
4.8
4.5
E
4.8
B
Q504
Q505
B
3.3
2.5~2.8
C
2
3.2~3.5
1.4~1.9
E
3.3
3.2~3.5
0.6
0.6
B
3.1
2.9~3.1
C
0
0
C
0
0
E
0
0
E
3.7
3.4~3.7
B
0
0
C
4.9
4.8~5
E
0
B
Q506
Q507
B
0
0
C
0
0
0
E
0
0
6.3
6.3
B
2.8
2.4~2.8
C
10.2
9.6~10
C
3.2
3~3.4
E
5.6
5.6
E
3.3
3.2~3.5
B
0
0.7
C
10.1
0
E
0
B
0
C
4.6
4.6
E
0
B
Q508
Q509
B
3.1
2.7~3
C
3.3
3.2~3.5
0
E
3.7
3.5~3.7
0
B
0
0
C
0
0
0
E
0
0
0.7
0.7
B
0
0
C
0
0
C
3.1
3
E
0
0
E
0
0
B
0.5
0.4~0.6
C
0
0
E
0
0
B
0
0
C
0
0
E
0
B
Q510
Q511
Q512
Q513
B
3.1
2.7~3
C
0
3.4~3.7
E
3.7
3.4~3.7
B
0.6
0.5~0.8
C
3.1
0
0
E
0
0
3.2
0.6~1
B
2
0
C
0
3.1~3.3
C
0
1.8~2.1
E
0.8
0
E
0
0
B
0
0.8~1.1
B
0
0
C
0
1.8~2.1
C
3.3
3.2~3.4
E
0
0.2~0.5
E
0
0
Q514
Q515
Q516
—20—
Note
IC’S Ref. No.
IC1
Unit [V] Pin
STBY
TALK
1
0.8~3.7
0.8~3.7
2
2.4
2.4
3
1.5
4
Note
Unit [V] Ref.
Pin
STBY
TALK
52
1.4
1.4
1
0
0
1.5
2
0
0
1.2
1
3
0
0
5
4.8
4.8
4
0
0
6
0
1.2
5
0
0
7
0
0
6
0
0
8
4.8
4.6~5.1
7
0
0
9
0~4.8
0
8
0
0
10
0~4.8
0
9
0
0
11
0~4.8
0
10
0
0
12
0
0
11
0
0
13
4.8
0
12
0
0
14
0
0
13
4.8
4.8
15
0~4.8
4.8
14
0
0
16
0
0
15
0
0
17
1.4
1.5
16
0
0
18
4.8
4.8
17
0
0
19
1.5
1.5
18
4.8
4.8
20
1.5
1.5
19
4.8
4.8
21
1.5
1.5
20
0
0
22
4.2
4.2
21
0
0
23
4.8
4.8
22
4.8
4.8
No. IC1
24
1~1.8
1.4
23
0
4.8
25
1~2.5
1.8~2.3
24
4.8
4.8
26
1
1.5
25
0
0
27
4.7~5
4.7~5
26
4.8
4.8
28
3.8~4.1
3.8~4.1
27
0
0
29
4.8
4.8
28
4.8
4.8
30
4.2
4.2
29
0
0
31
4.2
4.2
30
0
0
32
4.2
4~4.4
31
0
0
33
0
0
32
0
0
34
4.8
4.8
33
0
0
35
3.6
3.4~3.8
34
0~4.8
4.8
IC2
36
0
0
35
4.8
0
37
3.6
3.4~3.6
36
0
0
38
0
4.8
37
0
0
39
4.8
4.8
38
4.8
0
40
0.3~0.5
0.3~0.5
39
0
0
41
0.3~0.5
0.3~0.5
40
4.9
2.7
42
1.2
1.2
41
4.9
4.8
43
0
0
42
0~4.8
4.8
44
1.4
1.4
43
0
0
45
1.4
1.4
44
0
0
46
1.4
1.4
45
0
0
47
4.8
4.8
46
0
0
48
1.4
1.4
47
0~4.8
4.8
49
1.4
1.4
48
0
0
50
0
0
49
0
0
51
0
0
50
0
0
—21—
Note
Unit [V] Ref. No.
IC2
IC3
IC4
Pin
STBY
TALK
51
0
52
0
53
Pin
STBY
TALK
0
11
0.3~4.6
0.4~4.5
0
12
0
0
4.8
4.8
13
0
0
54
4.8
4.8
14
0
0
55
1.3~4.2
1.3~4.2
15
0
0
56
1.2~3.7
1.2~3.7
16
4.8
4.8
57
0
0
17
4.8
4.8
58
0
0
18
4.8
4.8
59
4.8
4.8
19
4.8
4.8
60
4.8
4.8
20
0
0
61
4.8
4.8
21
0
0
62
4.8
0
22
0
0
63
0
0
23
0
0
64
0
0
24
4.8
4.8
1
0
0
1
0
0
2
0
0
2
0
0
3
0
0
3
0
0
4
4.8
4.8
4
0
0
5
4.9
4.8-5 4.9
IC101
IC102
4.8
4.8
2
4.8
4.8
6
4.9
0
7
0
0
4.8
4.7~4.9
0
1
4.8
4.7~4.9
8
2
4.7
4.6~4.8
1
0
0
3
0
0
2
0
0
3
0
0
0.5
0.5
4
IC101
No.
1 3
IC5
Note
Unit [V] Ref.
0
0
IC103
5
0
0
4
6
0
0
1
0
0
7
0
0
2
0
0
8
0
0
3
0
0
9
0
0
4
0
0
10
4.8
4.8
5
3.3
3.3
11
0
0
6
3.3
3.3
12
0
0
7
0
0
13
0
0
8
3.3
3.2~3.5
14
0
0
1
3.3
3.2~3.4
15
0
0
2
3.3
3.1~3.6
16
0
0
3
0
0
17
0
0
1
3.3
3.3
18
0
0
2
0
0
19
0
0
3
0
0
20
2.2
2.2
4
0
0
1
2.4
2.4
5
0
0
2
2.4
2.4
6
0
0
3
2.4
2.4
7
0
0
4
2.4
2.4
8
0
0
5
2.4
2.4
9
0
0
6
0
0
10
0
0
7
0
0
11
3.3
3.3
8
0
0
12
0
0
9
0
0
13
0
0
10
1~3.6
1~3.6
14
3.3
3.3
IC501
IC502
IC503
—22—
Note
Unit [V] Ref. No.
IC503
Pin
STBY
TALK
15
1~3.3
16
0
17
Note
Unit [V] Ref.
Pin
STBY
TALK
3.3
1
3.3
3.3
0
2
0
0
3.3
3.3
3
0
0
18
0
0
4
0
0
19
3.3
3.3
5
0
0
20
0
0
6
0
0
21
0
0
7
0
0
22
0~3.3
0~3.3
8
0
0
23
0~3.3
0~3.3
9
0
0
24
0
0
10
0
0
25
0
0
11
3.3
3.3
26
0
0
12
0
0
27
0
0
13
0
0
28
0
0
14
3.3
3.3
29
0
0
15
3.2
0~3.2
30
0
0
16
0
0
31
0
0
17
3.3
3.3
No.
32
0
0
18
0
0
33
3.3
3.3
19
0
1.4~1.6
34
1~3.3
3.3
20
0
1.4~1.6
35
0
0
21
0
1.4~1.6
36
0
0
22
2.4~2.6
2.2~2.8
37
0
0
23
3.2
2.9~3.3
38
0
0
24
0.6~1.2
1.2~1.7
39
0
1
25
0~2
0.9~1.5
40
0
0
26
0.4
1.2~1.7
41
3.3
3.3
27
3.2
2.8~3.6
42
0~3.3
0~3.3
28
2.2~2.6
2~2.4
43
0
0
29
3.2
2.9~3.5
44
0~3.3
0~3.3
30
2.6
2.3~2.8
45
0~3.3
3.3
31
2.6
2.3~2.8
46
0
0
32
2.6
2.2~2.9
47
0
0
33
0
0
48
0
0
34
3.2
3~3.4 1.7~2.3
IC504
49
0
0
35
2
50
0~2.6
0
36
0
0
51
0
0
37
2
1.7~2.2
52
0
1~3.3
38
3.2
2.9~3.5
53
0
1~3.3
39
3.2
3.2
54
0
1~3.3
40
0.3~0.5
0.3~0.5
55
0
1~3.3
41
1.3~0.5
0.3~0.5
56
3.3
3.3
42
1.2~3.2
1.2~1.4
57
0
1~3.3
43
0
0
58
0
0
44
0
1.4~1.6
59
0
0~3.3
45
0
1.4~1.6
60
3.3
0
46
0
1.4~1.6
61
0
0~3.3
47
3.2
3~3.3
62
3.3
3.3
48
0
1.4~1.6
63
3.3
3.3
49
0
1.4~1.6
64
3.3
3.3
50
2.6
1.5~1.7
—23—
Note
Unit [V] Ref. No. IC504
IC505
Pin
STBY
TALK
51
0
0
52
2.5
1.4~1.6
1
0
0
2
3.6
3.4~3.8
3
3.3
3.1~3.5
4
3
2.2~2.4
5
0
0
Note
—24—
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