Jvc UXD 88 GD Service Manual

Page 1

UX~ D88GD UB/US/UT/U

, JVB

WEE?

COPYRIGHT ©1997 VICTOR COMPANY OF JAPAN, LTD

J DIGITAL Aunlo
Area Sufflx
UB .......................... Hong Kong
US ........................... Singapore
.......... Fan-"033
U ............................ Other Area
J
Contents
1. Safety Precautions --------------------------- Page2 8. Analytic Drawing and Parts List -------------- 52
2. Safety Precaution about UX- 088-- ----- 3 9. \Mring Connections~~ ~ 59
3. Instructions ........................ 5 10_ Block Diagram ..................................... 60
4. Location of Main Parts -- ~ 27 11. Standard Schematic Diaglams ---------------- 61
5' Remova of Main Parts ............................ 30 12 Location of P. C. Board Parts .................. 66
6. Main Adjustment .................................... 44 13. Electrical pans List ............................... 71
7. Out Line of Main IC ................................ 48 14. Packing ............................................. 84
No. 10042

July 1997

Page 2

UX * D88GD UB/US/UT/U

1. Safety Precautions

1. 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 pans must
be identical to those used in the original circuits. Service should be perlormed 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 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 ( A )on the schematic diagram and 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 res assembling the product. always perform an isolation check on the exposed metal parts 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 a"Leakage current tester". measure the leakage current from each exposed
metal part of the cabinet. particulary any exposed metal part having a return path to the chassis. to a known good earth ground, Any
leakage current must not exposeed 0.5mA AC(r.m.s.)

. Alternate check method

. . . AC VOLTMETEH
th AC d | tl ,
Plug e line cord irecty Into the AC ou et Use an AC voltmeter mi (Having 100° ohms/volt,
having 1.000 ohms per volt or more sensitivity in the following manner, or more sensitivity.)
Connect a 1.500 ohms 10W resistor paralleled by a 0.15 .11 F AC type a "
capacitor between an exposed metal part and a known good earth 0-15F AC TYPE
ground. Measure the AC voltage across the resistor with the AC
Place this probe
voltmeter, Move the resistor connection to each exposed metal part. w on each exposed
1500 n 10 W 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 Good earth ground

in the AC outlet and repeat each measurement Any voltage measured

warning (For Singapore only)

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 maintaintaind.
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.

A CAUTION

Burrs formed during molding may be left over on some parts of the chassis. Therefore. pay attention to
such burrs in the case of preformlng repair of this system.

2 (No. 10042)