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AND SERVICE MAINTENANCE INTRODUCTION This Maintenance and Service Section will help you maintain the CB42 within the published specifications and assureyears of useful application.
WARNING These servicing instructions are for use by qualified personnel only. To avoid electric shock, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so.
This section covers general maintenanceand complete recalibration instructions. The schematic and parts list as well as board legendsare included on separatesheets. The schematicsuseSencore's"Circuit Trace" color coding to aid in circuit tracing if service ever becomes necessary. Completewarranty information is included in the Quality AssuranceTag attached to the C842. The QA tag also includesgeneralwarningsapplylngto your CB42 and in-
formation on factory service.If you should find it necessary to return your CB42 for service,enclosethe QA tag with the final tester's signature.
FUNCTIONALDESCRIPTION AND BLOCK DIAGRAM EXt +12V INPUT
5'*t*ltt
L.E.D. DISPLAYASSEMBLY
CHANNELSELECTOR SWITCHASSEMBLY
COUNTERIN
9 PIN MOLE X
1(x)%AUDIO SIGNAL AUOTO MOOULATION
SPEAKERSU8 SWITCH ASSEMBLY
RF-IF OUTPUT
SPEAKER SUB
XTAL CHECK& SCOPE ADAPTERASSEMBLY
SCOPE ADAPTER
XTAL CHECK
Fig. 61-Block dingram of C842.
48
EXTFREO 50 !l
EXTFREO 1 MEG
WARNING These servicing instructions are for use by qualified personnel only. To avoid electric shock, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so.
This section covers general maintenanceand complete recalibration instructions. The schematic and parts list as well as board legendsare included on separatesheets. The schematicsuseSencore's"Circuit Trace" color coding to aid in circuit tracing if service ever becomes necessary. Completewarranty information is included in the Quality AssuranceTag attached to the C842. The QA tag also includesgeneralwarningsapplylngto your CB42 and in-
formation on factory service.If you should find it necessary to return your CB42 for service,enclosethe QA tag with the final tester's signature.
FUNCTIONALDESCRIPTION AND BLOCK DIAGRAM EXt +12V INPUT
5'*t*ltt
L.E.D. DISPLAYASSEMBLY
CHANNELSELECTOR SWITCHASSEMBLY
COUNTERIN
9 PIN MOLE X
1(x)%AUDIO SIGNAL AUOTO MOOULATION
SPEAKERSU8 SWITCH ASSEMBLY
RF-IF OUTPUT
SPEAKER SUB
XTAL CHECK& SCOPE ADAPTERASSEMBLY
SCOPE ADAPTER
XTAL CHECK
Fig. 61-Block dingram of C842.
48
EXTFREO 50 !l
EXTFREO 1 MEG
