Jvc DRE 53 BK Service Manual

Page 1

DR7E53BK
DR-E53LBK

.JVI:
SERVICE MANUAL

DR-E53BK
MODEL No. DR-E53LBK

Contents

Page Page
Safety Precautions t I- 2 Remote Control Unit .......................................... 1-79
Instruction Book ....... . 1» 3
Removal Procedures . 1»57 Schematic Diagrams ., .. Insertion
FM/AM Tuner Alignment Procedures . 1-59 Printed Circuit Boards Insertion
Adjustment Procedures (Cassette Deck) . 1-61 Connection Diagrams .. Insertion
Description of ICS . 1-64 Block Diagrams . ......................... Insertion
Internal Connections of the FL Display Tube . t 1-77 Parts List .......... , Separate-volume Insertion

No. 20170
Apr. 1990

Page 2

1

DR E 535K
DR~E53LBK

1. The design of this product contains special hardware and many Circuits and components specially tor 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 circurts. Service should be per-
formed 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 vvill void the manufacturer's warranty and will further
relieve the manufacturer of responsibility for personal injury or property damage resulting therelrom.

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
safetv characterislics are identified in the Parts List of Service Manual. Electrical components having such features
are identified ltv shading on the schematics and by (_'. l on the Parts List in the Servme Manual. The use of a sub-
stitute replacement which does not have the same safety characteristics as the recommended replacement part shown
in the Parts List nl Service Manual may create shock, fire, or other hazards.

4. The leads in the products are routed and dressed with ties, clamps, tunings, barriers and the like to be separated from
live parts, high temperature parts, moving parts antlfor sharp edges for the prevention of electric shock and fire hazard.
When service ét required, the original lead routing and dress should be obseived, and it should be confirmed that they
have been returned to nmmal, alter re-assembling.

5. Leakage current check (Electrical shock hazard testing)

Alter re-astembling the product, always perform an isolation check on the exposed metal parts o! 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.

I Plug the AC line cord directly into the AC outlet. USHlg a "Leakage Current Tester", measure the leakage current
lrorri each exposed metal part of the cabinet, particularly any exposed metal part having a return path to the
chasm, to a known good earth ground. Any leakage current must not exceed 0.5 mA AC lr ms).

0 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 sensi
tivity in the tollowrng manner. Connect a 1,500 9 10 W resistor paralleled by a 0.15HF ACAtype capacitor be
tween 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

{Safety Precautions
l

AC VOLTMETER
(Hat/trig 1000 ohms/volt.
or more senlrtmty l

part, particularly any exposed metal part having a " LJ 7

return path to the chassis, and measure the AC volt ° J C 6

age across the resistor. Now, reverse the plug in the k mace 5 probe
AC outlet and repeat each measurement. Any voltage ,_t_i._mn.. -z- on each exposed
measured must not exceed 0.75 VAC (r.m.s.). This isoon ~ow metal part-
corresponds to 0.5 mA AC (r.m.s.). "

Good earth around

rWarning , -

. This equipment has been designed and manufactured to meet international safely 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.

999N

2 lNo. 20170)