Jvc KD 85 Service Manual

Page 2

_ KD-85A/B/C/E/J/U

Contents

Specifications ............................ 2
Features ............................... 3
Controls and Connections .................... 3
Main Parts Location ........................ 4
Information Regarding New Technical Developments. . 6
Removal of the Main Parts ................... 10
Main Adjustment .......................... 12
Wiring Connection (Amplifier Circuit) ........... 19

" " (Mecha. Control Circuit) ....... 20
Standard Schematic Diagram (Amplifier Circuit) ..... 21

" " (Mecha. Control Circuit). 22
Maintenance ............................. 23

Specifications

Type : Stereo cassette deck
Track system 4-tr'ack, 2-channel
Cassettes C-SO, C-60, C-90
Frequency response
Chrome * : 20718900 HZ (Nominal)
30-16,000 Hz (Typical)
SF *2 20-17poo Hz(Nonnnm)

30-16,000 Hz (Typical)
Surpasses DIN 45 500
*1 ....... TDK-SA or Equivalent
*2 ....... MAXELL-UD or Equivalent
Signal-to-Noise ratio 56 dB (from peak level, weighted)
The S/N is improved by 5 dB at
1kHz and by 10 dB above 5kHz
with AN RS on.
Effect of Super AN RS (normal tape)
Improvement of S/N: the same as with ANRS
Improvement of fre-
quency response : OVU recording; 6dB at 10 kHZ
+5VU recording; 12 dB at 10 kHz
Improvement of
distortion
Wow and flutter

OVU recording; 3% less at 10 kHz
005% (WRMS)
0.18%(DIN 45 500)

Crosstalk 65 dB

Harmonic distortion 1.2%

Bias AC bias (95 kHZ)

Erasure AC erasure (95 kHz)

Heads Recording/playback; Sen-Alloy head
Erasure; Double gap, Ferrite head

Motors FG servo DC motor x 1
DC motor x 1

Tape speed 4.8 cm/sec.

2 x 30 minutes with 0-60 cassette
85 sec. with C-60 cassette

Recording time
Fast forward time

No.4165

Printed Wiring Board Parts

Main Amplifier ......................... 24
Spectre-peak Level ...................... 28
Control .............................. 30
Power Supply .......................... 33
Super ANRS .......................... 34
Other P.W. Board ....................... 36
Mechanical Component Parts List .............. 38
Mechanical Component Parts .................. 41
Enclosure Assembly and Electrical Parts .......... 42
Enclosure Assembly and Electrical Parts List' ....... 43
Packing, Packing Material Parts List ............. 47
Accessories .............................. 48
Rewind time 85 sec. with C-60 cassette

Playback equalizer time constant;
Normal/SF 3180 15/120):
SA/Cr02 & Fe

: 18 ICs. 65 transistors, 94 diodes

(including 30 LEDs), 5 zener

diodes and l hall element

MIC jack x 2
Max. sensitivity; 02 mV
Matching impedance;GOOQ-10k

Input jack x 2
Min. input level: 80 mV
Input impedance; 10 k9

Output jack x 2
Output level; 0-0.5 V
Output impedance; 3.3 k9
Matching load impedance;

50 kg or more

Headphone jack x1
Output level; 0-0.5 mW
Matching impedance;8§lil kSZ

Min. input level: 0.1mV/kSZ

Input impedance; 10 kfl

Output level; 0705 V

Output impedance; 3.3 k9.

Matching load impedance;

50 k9 or more

AC 120 V, 60 Hz (KD-85C/J)

AC 120 V, 220 V, 240 V, 50/60 HZ
(KD-85A/B/E)

AC 100 V, 120 V, 220 V, 50/60 Hz

Semiconductors

input terminals

Output terminals

DlN socket

Power requirement

(KD-85U)
Power consumption 30 W
Dimensions Width; 173/4 (450 mm)
Height; 7-1/8" (158 mm)
Depth; 12-7/8" (327 mm)
WEiQht 9.9 lbs (21.8 kg)

Design and specifications are subject to change Without notice.

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