JVC CD-1770 Service Manual

Contents
Page
Specifications ........ 0.2... ccc ccc 2
F@atu res cannes cese dere: a eta eae aeeeg aeie we ecwree ea Beas 3
Controls and Connections ............0000000e008 3
Main Parts Removing..............2000eeeeeees 4
Enclosure Assembly ..........000cc ce eeeeues 4
Electrical Parts 2.5.02. ic uiweeeke dew en's 6 5
Mechanical Parts ..............0000 cece eeees 6
Main Adjustments ........... 2.00 c eee eee eens 7
Trouble Shooting Guide .............. 00 eee eeee 12
Maintenance .......... 2... cc cece eee eee ees 13
Block Diagram... 0.2... ... ccc eee eens 14
Specifications
Type Stereo cassette deck
Track system 4-track, 2-channel
Cassettes C-30, C-60, C-90
Frequency response :
Signal-to-Noise ratio :
Effect of Super
ANRS
Improvement of
S/N :
Improvement of fre-
quency response :
Imrpovement of
distortion
Wow and flutter
Crosstalk
Harmonic distortion :
Bias z
Chrome *1 20 — 18,000Hz
(Nominal)
30 — 16,000Hz
(Typical)
Regular *2 20 — 17,000Hz
(Nominal)
30 — 15,000Hz
(Typical)
Supasses DIN 45500
*1 TP-18 or Equivalent
*2 QP-12 or Equivalent
56dB(JIS) The S/N is improved by
5dB at 1kHz and by
10dB above 5kHz with
ANRS on
62dB with ANRS
(DIN45500 weighted)
(normal tape)
the same as with ANRS
OVU recording; 6dB at 10kHz
+5VU recording; 12dB at 10kHz
OVU recording; 3% less at 10kHz
0.05% (WRMS)
0.18% (DIN45500)
65dB
1.2% (normal tape)
AC bias (95kHz)
Page
Wiring S622 Hit eta bt aioe Se aie te 15
Standard Schematic Diagram...............20005 16
Circuit Board Parts ............02 cece eee eeeee 18
Main Amp Circuit Board. ........... 0000 cca ee 18
ANRS Circuit Board ...............00000euee 22
Switch Circuit Board .......... 00000 e ences 24
Mechanical Component ..............00000eeeas 26
Enclosure Ass’y and Electrical Parts
except Circuit Board Parts .............0.0000. 32
ACCOSSOFICS 65 a oie cisie-bhe aWewcs ainate o Pree che ates 34
Pack ing 220i esavaretag ates GA ato iis Ge ahs Ae a 35
Erasure AC erasure
Heads Recording/playback
Motor
Tape speed
Recording time
Fast forward time
Rewind time
Semiconductors
Input jacks
Output jacks
Power requirement
Power consumption :
= Sen-Alloy head
Erasure = Ferrite head
Frequency control DC servomotor
4.8cm/sec
2 x 30 minutes with C-60 cassette
75sec with C-60 cassette
75sec with C-60 cassette
6 ICs
40 transistors
2 SCR and 30 diodes
MIC jack x 2
Max. sensitivity 0.2mV
Matching impedance 6002
Input jack x 2
Min, input level 78mV
Input impedance 1002
Output jack x 2
Output level 0~ 0.5V
Output impedance 10k
Matching load impedance 6.8ka
or more
Headphone jack x 1
Output level 0.3mV
Matching impedance 6.8k9 or more
AC 120V, 60Hz (CD-1770/C)
AC 240V, 50Hz (CD-1770A/B)
AC 220V, 50Hz (CD-1770E)
30W
Dimensions Width 16-1/2"' (420mm)
Height 3-1/2’ ( 88mm)
Depth 10-7/8”" (277mm)
Weight 12.1 Ibs (5.5 kg)
Design and specifications are subject to change without notice.
CD-1770/A/B/C/E a ee m
No. 4144

JVC CD-1770 Specifications

General

Brand	JVC
Model	CD-1770
Category	Cassette Player
Language	English