Jvc CD 1635 Service Manual

Page 2

Index

Page
Specifications ................................ 2
Features .................................... 3
Controls and Connections .................... . . 3
New Techniques .............................. 4
Sen Alloy Head ............................ 4
Careless Motor ............................ 5
Super AN RS Recording and Playback ........... 6
Main Parts Removing & Replacement ............. 9
Enclosure Assembly ........................ 9
Electric Parts .............................. 9
Mechanical Parts ........................... 10
Main Adjustments ............................ 12
Block Diagram ............................... 14
Circuit Board Parts ............................ 16

Specifications

Type Portable stereo cassette deck

Track system 4-track, 2-channel
Cassettes 030, 060, 090
Tape speed 4.8cm/sec
Frequency response
Chrome *1 25~18,000Hz (Nominal)
30~16,000Hz (Typical)
Regular *2 25~17,000Hz (Nominal)

30~ 15,000Hz (Typical)
Supasses D IN 45500
*1 TP-18 or Equivalent
*2 OP-12 or Equivalent
54dB (JIS)
The S/N is improved by SdB at
1l with ANRS on.
62dB with AN RS
(DIN 45500, weighted)
Effect of Super AN RS (Normal tape)
improvement of
Signal-to-Noise ratio
Improvement of
frequency response

Signal-to-Noise ratio

the same as with ANRS

OVU recording; 6dB at 10kHz
+5VU recording; 12dB at 10kHz
Improvement of
distortion OVU recording; 3% or less at 10kHz
+5dB recording;3% or less at 10k Hz
0,08% (WRMS)

0,20% (DIN 45511)

Wow and flutter

Crosstalk 6568

Harmonic distortion . 1.2% (standard tape)

Bias : AC bias (95kHz)

Erasure : AC erasure

Heads 2 heads
SA head for recording/playback
and ferrite head for erasure

Motor DC coreless motor

2 x 30 minutes with the

C-60 cassette

90 sec (with the C-60 cassette)
per track

90 sec (with the C-60 cassette)
per track

IC; 5, Transistors; 35,
Diodes; 29, SCR; 1

Recording time
Fast wind time
Rewind time

Semicond uctors

CD-1635-2, 00-1636
No. 4145

Page

Main Amp. ............................... 16
ANRS ................................... 20
Check ................................... 23
Muting ................................... 23
Mic Jack ................................. 23
Switch ................................... 24
Mechanical Components ....................... 27
Enclosure Assembly ........................... 30
Electrical Parts Except Circuit Board Parts ......... 32
Wiring ..................................... 34
Standard Schematic Diagram .................... 35
Accessories ................................. 36
Packing ................................... 37

input jacks Mic jack; 2
Max. sensitivity; 0.14mV (-75st)
Matching impedance; 20052~10kn
Input jack; 2
Max. sensitivity; 78mV (-20st)
Input impedance; 100m
Output jack; 2
Output level; 500mV (fixed)
Output impedance: 2km
Matching load impedance;
50k!) or more
Headphone jack; 1
Output level; 0.3mW
Matching impedance; 8!!
Min. input level; 11mV (-37st)
Input impedance; 9.2kn
Output level; 500mV
Output impedance; 2kn
Matching load impedance;
50kn or more
Output; 1.2W (distortion, 10%)
Impedance; 49
Diameter; 10cm
DC 9V (U1 x 6)
External DC power; 8~16V
AC power;
120V, 60Hz for CD-1636/C
240V, 50Hz for CD-1635-2A/B
220V, 50Hz for CD-1635-2E
100V,110~120V,200V
50/60Hz for CD-1635-2U

Output jacks

Recording connector :
(REC/PB)

Speaker

Power supply

Power consumption : 9W
Battery life ' Approx. 12 hours of continuous
recording (on super type batteries)
Approx. 5 hours of continuous
recording (on regular type batteries)
14-1/4(width) x 3-7/8(height)

x 9-1/2(depth) in.

11.5 lbs (including 6 batteries)

Dimensions
Weight

Design and specifications are subject to changewithout notice.

Page 20

AN RS Circuit Board

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CD-1635-2, CD-1636
No. 4145

Red prim is shown the voltage (V) of playback mode.
( ) voltage; at recording mode.

When you méasure the voltage by tester, we recommend you to use 20kn/V or more
impeadance tester.

PB Gam( R)
REC Gain(R)

DC Bias( R)

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Page 24

) voltage; at recording mode.
When you measure the voItage by tester, we recommend you to use 20kn/V or more

Red printed is shown the voltage (V) of playback mode.
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Switch Circuit Board

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Fig. 39

CD-1635-2, 00-1636

No. 4145

-24..

Page 37

Accessories

Parts No. Parts Name Remarks Qty
T46965-002 Demo Cassette (OT-626) 1
T30045003 Pin Cord ASS'V 00-1636/0, 00-1635-2A/U 2
CN201 DIN 00rd Ass'v CD-1635-2B/E 1
T47796-OOB Head Cleaning Stick 2
AP4056A-024 Envelope for 14.0. Stick 1
TLT000429-01 Caution Card 1
0MP2540-183 Power Cord CD-1635-2A 1
OMP9017-006 .. CD-1635-2B 1
0MP1240-183 ,. 00-1636/0 1
OMP3950-183 .. 00-1635-2E 1
OMP7640-183 » 00-1635-2U 1
TL0271319-OB Band Assy 1-
TJL000476-02 ANRS Seal 1
TJLOOO477-02 Super ANRS Seal 1
T7405E Instruction Book 00-1636 1
T7446EGF u 00-1635-2A/B/E/U 1
T7566EF -- 00-16360 1
T30994-037 Feature Tag 00-1636 1
BT20029 Warranty Card' 00-1635-2A 1
TLT052401-01 Warning Label 00-1635-2A/B/E 1
TLT000443-01 Seal CD-1635-2A/B/E/U, 00-1636/0 1
BT20013 Guarantee Certificate 004635-28 1
OZL1002~OO3 Warning label for P. Cord, 00-1635-28 1
TLT000462-02 3.8. Caution for 2-cove Cord, 00-1635-23 1
T46328-003 Caution Card 00-1635-28 1
T46328-OOI .. 00 -1635-2U 1
BT20025 Warranty Card 00-16360 1
T44362-OO1 CSA Marker 00-16360 1
TLT279401-01 Caution Label 00-1635-2E (for French market) 1
021.1031-001 SEV Seal 00-1635-2E 1
TLT279402-01 SS Label 00-1635-2E 1