Specification - JVC CD-1740 Service Manual

Index
Page
Specifications ........... 000: eee eee eee 2
Features: 2.24 sed cadet te eek wind pete wees 3
The Name of Parts. .... 2.0... . 0. eee eee eee ene 3
Main Parts Removing & Replacement ............. 4~6
Enclosure Assembly .........000e0eeeeeeeeee 4
Electrical Parts: .cce-d acts arse seeiviere ene cinerea ate 5
Mechanical Parts ............0-2 eee cece eens 6
Replacement and Adjustment of the Head ......... 7
Adjustments ........ 200 c eee eee teen eee eee 7
Cleaning and Oiling ......... 00.0. e eee eee e eens 9
Trouble Shooting ..........-- 22 cece ee eee eee 9
Circuit Board Parts .... 22.0. e eee ee eee e eens 10~ 14
Specification
Dimensions 405mm(W) x 97mm(H) x 217mm(D)
15-15/16" 3-13/16" 8-9/16"
Weight 4.2 kg (9.2 Ibs.)
Type Stereo Cassette Deck
Track system
Usable cassettes
Frequency response
S/N ratio
Wow & flutter
Crosstalk
Channel separation
Harmonic distortion
Recording system
Erasure system
Heads
Motor
Tape speed
Recording time
4-track 2-channel
C-30, C-60, C-90
Chrome tape 30~15,000Hz
(40~ 14,000Hz+3dB)
30~ 13,000Hz
(40~ 12,000Hz+3dB)
50dB at 1kHz from peak level
without Dolby NR
5dB at 1kHz
10dB at 5kHz or more improved
with Dolby NR
0.13% (WRMS)
60dB at 1kHz
30dB at 1kHz
2% at 1kHz (reference output level)
using normal tape
AC bias 95kHz
AC erasure 95kHz
R/P... Cronios Head
Erase. . Ferrite Head (double gap)
DC Electric governor motor
4.75cm/sec. (1-7/8inch/sec.)
60 min. for double pass (C-60)
Normal tape
Page
Main Circuit Board ............00 cee eee 10
Power Supply Circuit Board ............000008 13
Dolby NR Circuit Board ............... 00200 14
Mechanical Component ..............-2.000-000: 17
Enclosure Assembly ..........00c ees eueaeeeuee 20
Electrical Parts Except Circuit Board Parts ......... 22
WAG. ee g iii Si tice Thre a shed seid Lice ata ee 24
Standard Schematic Diagram ............0. 00000 25
Block Diagram ...... 2.0... c cee eee eee nee 26
Packing) sso esoc.eneass Save Sede salads sateen s 26
ACCOSSOFiICS: 225.d3ek Peis eptei aee eae oars eat 26
Fast forward time 130 sec. or less (C-60)
Rewinding time 130 sec. or less (C-60)
Semiconductors 2 ICs
24 transistors
26 diodes
2 FETs
Input MIC x2
Max. sensitivity 0.45mV
Matching impedance 10k
LINE x 2
Min. input level 100mV
Input impedance 220k2
Output LINE x2 0.42V
DIN connector
Power source
Power consumption :
Output impedance 1k2
PHONES x 1 0.3mW
Matching impedance 802
Max. sensitivity 20mV
Input impedance 84ka
Output 0.42V
Output impedance 1k2
AC 120V, 60Hz (CD-1740)
AC 240V, 50Hz (CD-1740A/B)
AC 220V, 50Hz (CD-1740E)
AC 100V,110~ 120V,200V,
220~ 230V , 50/60Hz
(CD-1740U)
15W
Design and specifications are subject to change without notice.
CD-1740/A/B/E/U
No. 4133