Jvc UXC 30 Service Manual

Page 1

UX C38 BxEEG/EN/G!

JVB
SERVCE MANUAL ___

UX- C30 B/E/G/EN/Gl

613%?

DIGITAL AUDIO

Area Suffix
B .......................................... U.K.
E Continental Europe

I Self- diagnosis function Germany
This model has a convenient self - diagnosis function for CD :III: ................. NorthEurltzgl:
section.

IThis model is divided by two colors to the black (BK) and white
(Wl') types (In the parts list, both of the types are indicated by
abbreviations (BK) and (W0).

Contents

1. Safety Precautions ------------------------------------- Page 2 9, Outline of Main |c .......................................... 55
2. Safety Precaution about UX 7 C30 ----- 10. Block Diagram ~~~~~~~~~~~~~~~~~~ 59
3. Instructions ------------------------------------- 11_ Wiring Connections ........... 60
4. Location of Main Parts ------------------------------------- 18 12. Standard Schematic Diagram -------------------------- 61
5. Removal of Main Parts ------------------------------ 22 13. Location of P. C. Board Parts ----------------- 67
6. Exploded View of Enclosure Assembly--- ------ 36 14. Electrical Parts List ------------------------------ 71
7. Main Adjustment ------------------------------------------- 42 15, Packing llustration and Parts List ...................... 32
8, Troubleshooting .............................................. 48
No.1960

March 1996

Page 2

UX - C30 B/ElG/EN/Gl

1. Safety Precautions

I. The design this product contains special hardware and many circuits and components specially for safety purposes 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.

2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made.
Any design alterations or additions will void the manufactures warranty and will further relieve the manufacture of responsibility for
personal injury or property damage resulting therefrom.

3. Many electrical and mechanical parts in the product 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 vottage, 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 ( ) and( A )on the
schematic diagram and by ( A ) on the parts list in the service manual. The use of a substitute replacement which does not have
the same safety characteristics as the recommended replacement part 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. mpving 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 it should be confirmed that they have been returned to normal.
after reassembling.

5. Leakage current check (Electrical shock hazard testing)

After rte-assembling the product, always perform an isolation check on the exposed metal pans of the product (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.

- Plug the AC line cord directly into the AC outlet. Using aLeakage 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 0.5mA AG(r.m.s.).

- Alternate check method
Plug the AC line card directly into the AC outlet. Use an AC voltmeter having 1.000 ohms per volt or more sensitivity in the
following manner, Connect a 1.500 ohms 10W resistor paralleled by a 0.15 11 F AC type capacitor between an exposed metal
part and a 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 0.75V AC(r.rn.s.). This corresponds to 0.5mA AC(r.m.s.).

A CAUTION

Burrs formed during molding may be left over on some parts of the chassls.
Therefore, pay attentlon to such burrs In the case of preforming repair of this
system.

2 (No. 1960)