Jvc KDGS 40 Service Manual

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KD- G340 C/J

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Contents

1 .Precaution ......
2. Specifications
3. Main Features---

4, Insiructions(Extracts) ............................................ 3
5, Location of Main pans ....................................... 13
6. Removal of Main Pans ~~~~~~~~~~~ ...15
7. Analytic Drawing and Parts Llst--- 18

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DIGITAL AUDIO

Area Suffix
- Canada
~~~~~ U.S.A.

8. Main Adjustment-

9, Block Diagram .....................
10. Wiring Connections .......................................... 33
11. Standard Schematic Diagram ---------------------------- 34
12. Location of RC. Board Parts .............................. 35

13. Electrical pans List ...... ' ...................
14, Illustration of Packing and Parts List -

No. 49207
April 1994

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KD-GS4O C/ J

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1.Precautions
IMPORTANT FOR LASER PRODUCTS Identification And Certification Labels
(For U.S.A. only)
Bottom panel oi the main unll
Precautions

1. CLASSl LASER PRODUCT
2. DANGER: invisible laser radiation when
open and interlock tailed or detected. Avoid

direct exposure to beam.

3. CAUTION: Do not open the top cover. There

US JVC CORP. 41 SLATER DRIVE
ELMWOOD PARK, N.) 07407

MANUFACTURED AT_

Product complies with DHHS Rules 2
CFR Subchaptcr J in effect at {late of
mantiiuclure.

MANUFACTURED

are no user-serviceable parts inside. Leave
all servicing to qualified service personnel. .

4. CAUTION: This CD player uses invisible
laser radiation. however, ls equipped with
safety switches to prevent radiation emission
when unloading CDs. It Is dangerous to
defeat the safety switches.

5. CAUTION: Use of controls, adjustments or NAMERATNG PLATE "ms:
performance oi procedures other than those -1 The date oi manulacture.
specified herein may result in hazardous -2 The in code of manuiaciuring piant
radiation exposure. '3 Marking at country origini
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I I - K
2. Specifications
CD PLAYER SECTION GENERAL
Type: Compact disc player Power Requirement
Signal 099? Syslem: Non-contact 0W! PICKUP Operating Voltage: DC 14.4 volts (11 to 16 volts
(semiconductor laser) allowance)
Number of Channels: 2 channels (stereo) Grounding System: Negative ground
Dimensions (W x H x D) Installation Size: 175 x 50 x
Frequency Response: 510 20,000 Hz 151 mm (74115" X 2 X 6")
Dynamic Range: 95 dB Panel Size: 190 x 58 x 13 mm (7-1/2" x 2-5/16" x
Signal-to-Ncise Ratio: 97 dB 9/16")
Wow & Flutter: Less than measurable limit Gross Weight: 2.1v kg (4.7. lbs) (
AUDIO AMPLIFIER SECTION Design and specifications subject to change without
Maximum Power Output: (Front) 22 W per channel notice.
(Rear) 22 W per channel

Continuous Power Output (HMS): (Front) 3 W per

channel Into 4 Q, 40 to 20 000 Hz at no more than . .
0.8% total harmonic distortion. (Rear) 3 W poi " a k" '5 necessary for your car. consult

channel Into 4 n, 40 to 20,000 Hz at no more than YOUf telephone fiiYeCtory for the nearest car
0.3% total harmonic distortion. audio speoallty shap.
Load impedance: 4 o (4 to 8 n allowance)
Tone Control Range
Bass: :10 dB at 100 Hz
Treble: :10 dB at 10 kHz
Frequency Response: 40 to 20 ,000 Hz (
Slgnal-to-Noise Ratio: 70 dB ,

RADIO SECTION
Frequency Range .
FM: 37.5 toiO7.9 MHz 3. Maln Features
(with channel interval set to 200 kHz)
87.5 to 108.0 MHz
(with channel interval sel to 100 kHz) . "Direct-in" disc loading system
AMi539l° 1.710 KHZ a Direct Access Play/Skip Play/Search Play/
gmfiaggemfwa' 59' m 10 kHz) Repeat Play/Random Play/Intro Play
. ' n 9 kH o AM/FM Stereo PLL Synthestzer Tuner
"m" chm "5 55 ° 2 o {EA-Station Preset Tuning (FM-18. AM-6)
[FM WW] 0 Preset Scan/Seek/Manual Tuning
Usable Sensitivity: 12.1 dBI ( 1.l IAV/75 9) e 4-Channei Amplifier System

so as Quieiing Sensitivity: 16.3 dBi (1.3 ttV/rs o) _ Maximum Power ompm of 22 watts pe ,

channel (Front)/22 watts per channel (Rear)
Alternate Channel Selectlwty: (400 kHz): 65 dB . Digital Clock Display

Frequency Response: 40 to 15,000 Hz
Stereo Separation: 35 dB
Capture Ratio: 2.0 dB

(AM Tuner]
Sensitivity: 20 W
Selectivity: 35 dB

xx

2 (No. 49207)

Page 28

ID-($540 C/J

I CD Section

lteme

Conditions

Adjustment and Confirmation

Standard Value Adjusting

1. TOC check Oscilloscope

2, Not to occur unclear indication and uneven lighting

1. Confirm lighting illumination by power on.

ol LCD.

2. AF level Measuring instruction
(eye-pattern) Oscilloscope

1. Connect the oscilloscope between TPl and

TP2 to confirm that peak-to-peak value of

Within

1.5V i SOOmV

tracking error signal (oscilloscopee

waveforms) becomes zero.

when the tracking offset meter is used for

measurement, lt shorld read "0 (zero).

Note : Adjust VR501 so that the waveform is
Vertically symmetric about the zero
level. use a direct coupling oscilloscope
input. '

Tracking offset waveform

check eye-pattern waveform is within 1.5V : 300mV
Eye pattern waveform
This amplitude should
be maximum and the
waveform clear.
- Fig. 8 - 5
3. Tracking Measuring instruction Adjustment procedure
offset Oscilloscope 1. Connect the oscilloscope between TP2 and
adjustment TP3 .
2. Play back the disc.
3. Shot circuit TP2 and TP4.
4. ddjust VR501 so that the DC level of the zero level VR501

Set the P-P
center ol
the 0C level
0 1610.

Fig.8 -6

4.0utermost
circumference

i. Directly access the outer circumference track
31, check that play is performed normally
and that abnormalities including sound
jumping do NOT occur.

5. Outer to
inner
circumferenc

1. Skip from the outer circumference track 24
(also possible with other disc's outermost
circumference) to track1 and check the time
till play starts. Normally it is less than 5
seconds.

24 (No. 49207)

Page 60

KD-GS4O C/ J

VICTOR COMPANY OF JAPAN, LIMITED.

AUDIO PRODUCTS DIVISON

10-1, 1-chome, Ohwatan-cho, Maebashicity 371, Japan

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Printed in Japan
-H 0604-8-