Jvc RX 500 B Service Manual

Page 1

Contents

Safety Precautions ....................... 1-1 6. Block Diagram/Wiring Connection ..........
1. Specifications 1-2 7. R~XSOOB Schematic Diagram
2. Names of Parts and Their Functions .......... 1-3 7-) RvXSOOB Tuner Section ..............
3. Technical Explanations 742) R-XSDOB Logic Section ........... .
3-) Terminal Layout Diagram 1-7 7-(3) R-XSOOB Amplifier Section ......
3-(2) Interior Block Diagram .......... 1-7 8. Servicing Method for AWG #20
3-(3) Explanation of Each Terminal .......... 1-8 Wires with Clamping Terminals ...........
CH4) Power Supply Switching Circuit ........ 1-9 9. Handling precautions of LCD panels ......
4. Removal Procedures ................ 1-10
5. Adjustment Procedures
5-(1) FM/AM Tuner P.C. Board ............ 1-H
5-(2) Power Amplifier P.C. Board ........... 1-12

This manual combines two single volumes; Service manual and Parts list.

1-14

. 1-15

146

i-17

33
584

Page 2

Safety Precautions

i. The design of this product contains special hardware,
many circuits and components specially for safety pur-
poses.

For continued protection, no changes should be made
to the original design unless authorized in writing by
the manufacturer. Replacement parts must be identical
to those used in the original circuits. Service should be
performed by qualified personnel only.

Alterations of the design or circuitry of the product
should not be made. 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.

Many electrical and mechanical parts in the product
have special safety-related characteristics. These charac-
teristics 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 parts list of Service manual. Electrical components
having such features are identified by shading on the
schematics and by l A ) on the pans list in Service

manual. The use of a substitute replacement which does'

not have the same safety characteristics as the recom-
mended replacement part shown in the parts list in
Service manual may create shock, fire, or other halards.
. The leads in the products are routed and dressed with
ties, clamps, tubings, barriers and/or the like to be
separated from live parts, high temperature parts, mov-
ing 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 be observed, and they should be confirmed
to be returned to normal, after re-assembling.

5. Leakage current check
(Safety for electrical shock hazard)
After re-assembling the product. always perform an
isolation check on the exposed metal parts of the
Products (antenna terminals, knobs, metal cabinet,
screw heads, headphone jack, control 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 part of the
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 0.5 mA
AC (r.m.s.).
Alternate check method.
Plug the AC line cord directly into the AC outlet.
Use an AC voltmeter having 1.000 ohms per volt or
more sensitivity in the following manner. Connect a
1500 I2 10 W resistor paralleled by a 015 pF AC-
type capacitor between an exposed metal part anda
known good earth ground.
Measure the AC voltage across the resistor with the
AC voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a
return path to the chassis, and measure the AC
voltage across the resistor. Now, reverse the plug in
the AC outlet and repeat each measurement. Any
voltage measured must not exceed 0.75 V AC lr.m.s.).
This corresponds to 0.5 mA AC (r.m.s.i.

AC V0 LTMETER
(Having 1000 ohms/volt,
or more sensitivity.)

EEl

o
0 15 in; AC YV'E
Place this probe
vv. ~> on each exposed
.590 n lDW

metal part.

Good Earth Ground

CHECKING YOUR LINE VOLTAGE (Except for U.S.A.,
Before inserting the power plug,

CAUTION Before selecting the "Voltage selector switch

please check this setting to see that it corresponds with the line voltage in
your area. If it doesn't, be sure to adiust the voltage selector switch to the proper setting before operating this
equipment. The voltage selector switch is located on the rear panel.

Canada, Australia, U.K. and Continental Europe.)

{}

22w

24ml

5
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to proper voltage disconnect the power plug. "m

1-1 (No. 2733)

Page 42

KW

3-(5) ENC-0090 Amp P.C. Board Assy

Note: ENC-009 D varies according to the areas employed. See hotel!) when placing on order.

Note (1)

P.C. Board Ass'y

Designated Areas

ENC-009 [E U.S.A., Canada, U.S. Military
Market & Other Countries
ENC-009 E Europe, Australia 8: U.K.
LENC-OOQ West Germany

ENC-UOQ-Z

For Service Manuals Contact
MAURITRON TECHNICAL SERVICES
8 Cherry Tree Rd, Chinnor
Oxon OX9 4QY
Td:~ 01844-351694 Faxz- 01844-352554
Emailz- amuiries®maurilmncout

.
ABCDEFG

Talisman Trimmers
hum Nu. Part Number Dmrimion ltom No. Part Numbcr Dmimion i3
Mali-r Maker
0311 250655(5,Fl Silicon Hitachi 0318 2SCZZ40A.B) Silicon Toshiba
0311 2SDSSSiE,Fl SiliCOn Hitachi 0319 DTC144N Silicon
0311 250655lE,F) Silican Hitachi 032D DTA114YN Silicon
0312 2SDSSSE,F) SiliCOn Hitachi 0321 DTC144N Silicon

0312 280655(5,Fl

Silicon Hitachi

0322 DTAIMYN silicon

0312 2SDS§5(E,F)
0313 250655lE,Fl
0313 250655iE.Fl
0.313 ZSDSSSlE,Fl
03M 28D655iE,F)

Silicon Hitachi
Silicon Hitachi
Siliccn Hitachi
Silicnn Hitachi
Silicon Hitachi

0323 25K!63[L2,M1l F.E.T,
0323 25K163lL2,M1l F.E.T.
0323 2SK1631L2.M1) F .
0324 2SK163lL2.M1l F
0324 25K163lL2,M1) F

0314 25D655(E,Fl
0314 280655lE.Fl
0315 2SC2240(A,Bl
0318 2SC2240lA.Bl

0317 25C2240lA,Bl

Silicon Hitachi
Silicon Hinehi
Silicon Toshiba
Silicon Toshiba

Silicon Toshiba

0324 25K!S3(L2,M1i F.E.T.
0501 2SC2240lGR,EL) Silicon Toshiba
0502 28C2240lGR.BLl Silicon Tashiba
0503 ZSC2240iGH,BL) Silicon Tuihiba

0504 2SC2240lGR,BLl Silicon Toshiba

(No. 2733! 245