Jvc TDW 7 SD Service Manual

Page 1

TD-W7SDcu

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I .Features/Speclflcatlons ------ 4 7.Locatlon of P.c.Board parts
- .Instructlons . . . . ........... . . . ................... 5 and Parts Llst ..................... 30
1.Locatlon of Main Parts - - 12 B.Exploded View of Enclosure Component Parts
anemoval Of Mam Parts .......................... 13 and Parts Llst ..................... 4o
3.Maln Adjustment 18 9.Exploded View of Mechanism Component Parts
4.erlng Connections ........ . . . . . . . ....... . . . . . . . 25 and parts 5 ..................... 42
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5.Block Diagram . . . . . . . . . . . ........................ 25 10.Packlng musrauon and Parts Llst . . . .......... 43

No. 4359
July 1995

Page 2

TD-W7SDcu

I Safety Precautios

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 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 tor
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 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 parls. 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 contirmed that they have been returned to normal.
after reassembling.

5. Leakage current check (Electrical shock hazard testing)

After re - assembling the product, always perform an isolation check on the exposed metal parts at the product (antenna
terminals. knobs. metal cabinet. screw heads, headphone lack. 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. 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 ACtr.m.s.)

EB AC VOLTMETER
. Alternate check method (Having 1000 ohms/volt,

or more sensitivity.)
Plug the AC line cord directly into the AC outlet. Use an AC

a r

___l
0.15 uF AC TYPE

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 [1 F AC type capacitor between an exposed metal part and Place this DTObE
W on each exposed
a known good earth ground. Measure the AC voltage across the 1500 51 10W metal part.

resrstor With the AC voltmeter. Move the reststor connection to each Good earth ground
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.m.s.).This corresponds to 0.5mA AC(r.m.s.).

2 (N0. 4359)