Jvc KDVR 5 Service Manual

Page 1

Note

The Head Assemblies of KDVVRSJ 2 i -»

~ 08045000)

2' 20170 are different. (2000 units among those with Serial No. 08040001

Please refer to the Schematic Diagram in the Cautions column, the Wiring Connection and the last part of the

Mechanism Assembiy parts List,

Contents

Safety Precautions
Features ...............
Specifications . ........................ .
Name of Parts and Their Functions
Location of Main Parts _.
Removal of Main Parts ..
Main Adjustment ........
IC Function Explanation
1. Meter Section
2 Counter Section
3. Mecha Control Section
Block Diagram .....................
Wiring Connections (1) .
Wiring Connections (2) .

Page

Stnadard Schematic Diagram of KD»VR5
(Amplifier Circuit) .............................................. 24

Standard Schematic Diagram of KDVVRS
(Mecha Control Circuit) ...................................... 25
P.C. Board Parts .............................. . 26
Exploded View of Enclosure Assembly 27
Exploded View of Mechanism Assembly . 28
Enclosure Assembly Parts List .......... .29
Mechanism Assembly Parts List . 32
PCs Board Parts List 34
Packing and Parts List 42
Accessories ............... . 43
Dimentions .......................................................... 43

No. 4252
May 198?»

Page 2

KD-VR5 A/B/C/E/G/J/U

Safety Precautions

1. The design of this product contains special hardware.

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. Repacement parts must be identical to
those used in the original circuits. 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 or additions will void
the manufacturer's warranty and will further relieve the
manufacturer of responsibility for personal injury or pro
perty damage resulting therefrom.

3. Many electrical and mechanical parts in the product have
special safety-related characteristics. These characteria
stics 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 hav»
ing such features are identified by (A) on the schematics
and parts list in 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 in 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/or the like to be
separated from live parts, high temperature part, mov-
ing parts and/or sharp edges for the prevention of elec-
tric shock and fire hazard.

When service is required, the original lead routing and
dress should be observed, and they should be confirm-
ed to be returned to normal, after rerassembling.

5. Leakage current check
(Safety for electrical shock hazard)

After re-assembling the product, always perform an isola
tion check on the exposed metal parts of the Products
(antenna terminals, knobs, metal cabinet. screw heads,
earphone jack, control shafts, etc.) to be sure the pro-
duct is safe to operate without danger of electrical shock.

2 (No. 4252)

Do not use a line isolation transformer during this check.

0 Plug the AC line cord directly into the AC outlet. Us-
ing a "Leakage Current Tester", measure the leakage
current from each exposed metal part of the cabinet,
particularly any exposed metal part having a return
path to the chassis, to a known good earth ground
(water pipe, etc.). Any leakage current must not ex,
ceed 0.5 mA AC lr.m.s.).

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
sensitivity in the following manner. Connect a 1500 Q
10 W resistor paralleled by a 0.15 HF AC-type
capacitor between an exposed metal part and a known
good earth ground (water pipe, etc.)
Measure the AC voltage across the resistor with the
AC voltmeter.
Move the resistor connection to each 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 0.75 V AC
(r.m.s.l.
This corresponds to 0.5 mA AC (r.m.s.).

AC VOLTMETER
I ; (HAVING 1000 QIV,
OR MORE SENSITIVITY)

0.15 llF AC>TYPE

CL:

1500910W

PLACE THIS PROBE
ON EACH EXPOSED

GOOD EARTH GROUND METAL PART