Jvc XLMC 222 BK Service Manual

Page 1

XL-MC22ZBK

JVD
SRIEVCE MANUAL

>
Area Suffix
m We... \ m I . , V BS U.K
C Canada
EF Continental Eulope
Except Germany
and Italy
y . EN Nordic Countris
,l 7777777 V __,, G Germany
' J the USA.
US Singapore
UT Taiwan
U Universal except
all of above
rnunu I luv Mm
2 ?W flail-i
Contents
Safety Precautions ------------------- 1-2 Maintenance of Laser Pickup .......... 2-21
Instruction Book ---------------------- 1-4-11 Replacement of Laser Pickup ......... 2-21
Discription of Majar ICs -------------- 2-1 Block Diagrams ........................ 2-22
Internal connection of Display -------- 2-10 Schematic Diagrams .................. 2-23
\Disassembly Proceduers ------------ 2-11 Printed Circuit Boards ----------------- 2-26-27
"Flow _of Functional Operation Until 2-20 Parts List .............................. 3-1-17
TOC us Read
No. 20643

COPYRIGHT © 1997 VICTOR COMPANY OF JAPAN, LTD.
Aug ust 1 997

Page 2

XL-M0222BK

- Safety Precautions

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.
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 manufacturer' s warranty and will
further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.
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 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.

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 reassembling.

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 éLeakage Current Testeri, measure the leakage
current from each exposed metal parts of the cabinet , particularly any exposed metal part having a return
path to the chassis, to a knovm good earth ground. Any leakage current must not exceed 0.5mA AC (runs).

0 Alternate check method
Plug 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 1,5009 10 W resistor paralleled by a 0.15pF AC-
type capacitor between an exposed metal part and a known good earth ground.

Measure the AC voltage across the resistor with the AC VOLT METER

AC voltmeter. Move the resistor connection to each (Having 1000 ohms/volts,
exposed metal part, particularly any exposed metal 0" more sensmViW)
part having a return path tothe chassis, and meausre 0 c
the AC voltage across the resistor. Now, reverse the
plug in the AC outlet must not exceed 0.75 V AC
(r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). -"- Place this probe

i W l r on each exposed
1500 o 10 w metal part.

0.15 p F AC TYPE

Good earth ground

- Warning

P1 2593??!

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

It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
Repairs must be made in accordance with the relevant safety standards.

It is essential that safety critical components are replaced by approved parts.

If mains voltage selector is provided, check setting for local voltage.

CAUTION Burrs firmed during molding may be left over on some pans oi the chassis.Therefore,

pay attention to such burrs in the case of preforming repair of this system.

Page 7

XL-MCZZZBK

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