Jvc UXT 250 R Service Manual

Page 1

UX-TZSOR

e JVG e
SERVICE MANUAL

UX-T250R

[ilfigffi

DIGITAL AUDIO

Area Suffix

E ------ Continental Europe

o /«.\ o

Contents

1. Safety Precautions
2. Important for Laser Products ------
3. Instructions -------------------------
4. Location of Main Parts -

Cassette Mechanism
SLC-S1 M

System CPU
UPD78064GF

Optical Pickup
OPTIMA~1 SOS

CD Signal Processor
MN3551O

8. Block Diagrams

9. Wiring Connection
10. Schematic Diagrams
11.Location of PC. Board Parts -

5. Removal of Main Parts ------ 2.3 12. Analytic Drawing and Parts List

6. Main Adjustment ------------ 2-12 13. Electrical Parts List ----------- -- 4.7

7. Out Line Of Main 10 ------------------------- 2-16 14. Packing ------------------------------------------ 4-18
No.20693

COPYRIGHT © 1998 VICTOR COMPANY OF JAPAN, LTD.

July 1998

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UX-T250R

1-2

-Safety Precautions

1.This design of 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 Services 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 manufacturers 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 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 Parts List of
Service Manual. Electrical components having such features are identified by shading on the
schematics 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
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 be observed, and it should be confirmed that they have been returned to normal, after
re-assembling.

5. Leakage currnet check (Electrical shock hazard testing)

After re-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.

0 Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the
leakage current from each exposed metal parts of the cabinet,particularly any exposed metal part
having areturn path to the chassis, to a known good earth ground. Any leakage current must not
exceed 0.5mA 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 1.5005210W resistor paralleled byaO.15/JF
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. AC VOLTMETER
Move the resistor connection to eachexposed metal a (Having1000
part, particularly any exposed metal part having a ohms/voile,
return path to the chassis, and meausre the AC 0' more senSiiVltY)
voltage across the resistor. Now, reverse the plug in
the AC outlet and repeat each measurement. voltage o_15uF AC TYPE
measured Any must not exceed 075 V AC (r.m.s.). .
This corresponds to 0.5 mA AC (r.m.s.). -"_- 5:22:21:
1 'WI V each exposed
15009 10W metalpart.

Good earth ground

-Warnmg
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.

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

Page 16

UX-T250R

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Page 93

I Packing Parts List

BLOCK N0. REMEDIES

UX-T250R

A REF. PARTS NO. PARTS NAMR REMARKS QTY SUFFlX CLR
P 1 VPE3026-006 POLY BAG FUR SET 1
P 2 QPAOlZOESOS POLY BAO FOR PowER CORD '1
P 3 VPE3026-OOA POLY BAG FOR INSTRUCTION 1
P z. OPAOI702503P POLY BAG FOR AM ANT 1
P 5 LV10072-001A CARTON 1
P 6 VPH1709-OOI CUSHION 1
P 7 VPH1709-002 CUSHION P 9 VGSPOZA-OOA CUSHION FOR SPEAKER 2
P Io VPKSOOI-OIzsC SHEET FOR SET 1
I Accessories Parts List
BLOCK NOMEIEEEIID
A REF. PARTS NO. PARTS NAME REMARKS QTY SUFFIX CLR
A 2 LVT0059-OO1A INSTRUCTIONS 1
LVTOOS9-002A INSTRUCTIONS 1
A 3 BT-SLOOS-l w.CARD 1
A 8 GMP39FO-183 PowER CORD I
A 9 EwPSO3-001 ANT.wIRE FM ANT 1
A IO VGR0063-301 REMOCON UNIT 1
A II R68PTT/ZSTS BATTERY FOR REMOCON 1
A 12 OAL0014~001 AN LOOP ANT AM ANT 1
A 13 UXTISOH-SPBOX SPEAKER SYSTEM L/R + CUSHION I

4-19