Jvc KXG 50 Service Manual

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KX G50

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GRAPHICS
Safety Precaution ................................................ 1.2 Block Diagram(CD sedion) ................................. 1.31
Instruction Book ................................................... 1.3 Block Level Diagram ...... ................................... 1.32
Descyipfio" of Major ICS ....................................... 1_12 Schematic Diagrams ....................................... Insertion
Disassembly Procedures --------------------------------------- 1-21 Primed Circuit Board ------------------------------------- Insertion
Adjustment Procedures ....................................... 1_25 Parts L151 ............................................................ 2.1
Connection Diagram ................................. . ........... 1.31]

No. 20519

COPYRIGHT © 1995 VICTOR COMPANY OF JAPAN LTD. Ma... 1995

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KXwGSO

Safety Precautions

l. The design of this product contains special'whardware and/many circuits and components
specially for safety purposes. For continued protection, no changes should be made to the
original designsunless authorizedjn writing, by.the.manuiacturer. Replacement parts must.
beidentical .togti'iosew used in the original circuits. services- should be performed by
qualmedpersonneloniy

2Wns at the design or» circumy of the Hpraduct shotdd not be made. dflifi
alterations at the product should not be madv; Any design alterations or additions wr
void the manufactureds warranty and wwiti funnier relieve the manufacture of responsibility
for personal, injmy or ,prapertytdamage resolfingtherefrom.

3. Many electrical and mechanical pants in the products have special safety-related
characteristics. These characteristics are often not evident from visual inspection nor can
the protection afforded by them necessarily be obtained by using replacement components
rated for higher voltage, wattage, etc. Replacement parts which have these special safety
characteristics are identified in the PartseListV-of Service Manual. Electrical components
having such features are identified by shading on they-schematics and by (A) on the Parts
List in the Service Manual. The use of a'substitute repalcement which does not have the
same safety characteristics as the recommended replacement parts shown in the Parts List of
Service Manual may create shock, fire, or other hazards.

4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and
the like to be separated from live parts, high temperature parts, moving parts and/or sharp
edges for the prevention of electric shock and_,fire hazard. ~When service is required, the
original lead routing and dress should beaebservedwandit should be confirmed that they
have been returned to normal, afterW-resassembling.

5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling the product. always perfosmdanéisotationvdseek on the exposed metal
parts of the product (antenna terminals, knobs, metalscabinet, screw, heads. headphone jack,
contorl shafts, etc.) to be sure the product is safe to operate without danger of electrical
shock.
Do not use a line isolation transformer during this check.

0 Plug the AC line cord directly into the AC outlet. Using a Leakage Current Tester",
measure the leakage current from each exposed metal pm .xthe cabinet, particularly
any exposed metal part having a return path to the Chassis, to a known good earth
ground. Any leakage current must not exceed 0.5mA AC (rams).

0 Alternate check method
Plug the AC line cord directly into the AC outlet. UsfirafitA£-LW. having, 1,000
ohms per volt or more sensitivity in the Waggmrtei ,. Cousteau-1,5000 10 W
resistor paralleled by a 0.15 pF AC-type apmrbeweenvmmdmecal part and a
known good earth ground.

Measure the AC voltage across the rem -WT%EOTER
with the Ac voltmeter. Woks,
Move the resistor connection to each exposed: , a m we M'M'WJ
metal part, particularly any exposed metaleém f j '
having a return path to the chassis, and sear ACTYPE,
meausre the AC voltage across the resistor.:,. -||-
Now, reverse the plug in the AC outlet and a: this
repeat each measurement. Any voltage .-.- >Egghee$osed
measured must not exceed 0.75VAC (r.m.s.). 150°91°W metalpart;
This corresponds to 0.5 mA AC (r.m.s.). Good earth ground

---Warmng

1. This equipment has been designed and manufactured to meet international safety standards.

2. it is the legal responsibility of the repairer to ensure that these safety standards are
maintained.

3. Repairs must be made in accordance with the relevant safety standards.
4. It is essential that safety critical components are replaced by approved parts.
5. If mains voltage selector is provided, check setting for local voltage.

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