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JVC TD-W717TN Service Manual page 4

Double cassette deck
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(8SEP7
ON)
PF
INSTRUCTIONS
TD-W7SD/W717/W718
0.
DOUBLE CASSETTE DECK
CORD Peg "4
cr
WF BASEN
Component
TD-W7SD
For Customer Use:
Enter betow the Model No. and Seriat
No. which are located on the rear of the
cabinet.
Retain
this
information
for
future reference.
Model No.
Serial No.
TROUBLESHOOTING
What appears to be trouble Is not always real trouble. Make
sure first...
1. Cassette cannot be loaded.
@ Is the cassette positioned correctly?
2. When PLAY button is pressed, tape does not move.
@
ls the tape too loosely wound?
3. Tape runs, but no sound Is heard.
® Are ali connections properly and securely made?
@ Is the MONITOR switch of the stereo amplitier set to the
TAPE position?
@ Is the VOLUME contro! of the stereo amplifier set to MIN?
4. Sound quality is poor.
@
Is the DOLBY NR switch set to the right position?
@
Is the head section dirty?
® Is the record/playback head magnetized?
@
Is the tape worn out?
SPECIFICATIONS
Type
: Double cassette deck
Track system
1 4-track, 2-channel
Tape speed
: 4.8 cm/sec (1-7/8 inch/sec) (Normal)
9.5 cm/sec (3-3/4 inch/sec) (High)
Frequency
response
:(-20 dB recording)
(TD-W7SD) _: Type IV tape ; 10 - 20,000 Hz
20 - 19,000 Hz (+3dB)
Type Ii tape ; 10 - 19,000 Hz
20 - 17,000 Hz (+3dB)
Type ttape
; 10- 19,000 Hz
20 - 17,000 Hz (+3dB)
{TD-W717/718) : Type iV tape ; 20 - 17,000 Hz
30 - 16,000 Hz (+3dB)
Type Ii tape
; 20 - 16,000 Hz
30 - 15,000 Hz (+3dB)
Type I tape
; 20 - 16,000 Hz
30 - 15,000 Hz (+3dB)
: $8 dB (S = 315 Hz, k3 = 3%, N=
A-weighted, Type IV tape)
The S/N is improved by about 15 dB at
§00 Hz and by max. 20 dB at 1 kHz -
10 kHz with Dolby C NR on and improved
by 5 dB at 1 kHz and by 10 dB at above
5 kHz with DOLBY B NR on.
S/N ratio
improvement
of MOL
: 4 dB at 10 kHz with Dolby C NR on.
Wow and flutter
: 0.08% (WRMS), +0.2% (DIN/IEC)
Channel
separation
: 40 dB (1 kHz)
Crosstalk
:60 dB (1 kHz)
Harmonic
distortion
(TD-W7SD)
—_:k3; 0.5% (Type IV tape, 315 Hz, 0 VU)
(TD-W717/718) :k3; 0.8% (Type IV tape, 315 Hz, 0 VU)
Design and specifications are subject to change without notice.
5. Recording cannot be performed.
© Are the safety tabs of cassette tape broken?
@
Are all connections properly and securely made?
®
Is the head section dirty?
6. Previous recording is not completely erased.
® Is the erase head dirty?
7. Since tape speed is irregular, wow and flutter occur.
@ Is the pinch roller or capstan dirty?
® ts the tape rewound too tight?
8. MUSIC SCAN operation does not function property.
® Are the non-recorded sections too short (3 sec. or less),
or do they contain high level noise or hum?
9. The BLANK SKIP indicator Is lit yet the BLANK SKIP opera-
tion does not function properly.
@ is the other deck operating MUSIC SCAN?
BLANK SKIP operation begins after MUSIC SCAN has fin-
ished.
Heads
(TD-W7SD)
=: AMORPHOUS head for record/
playback,
2-gap ferrite head
for erasure;
combination head x 1
(For both decks A and B)
(TD-W717/718) : METAPERM head for record/
playback, 2-gap ferrite head for erasure;
combination head x 1
(For both decks A and B)
Motors
: Electric governed DC motor tor capstan x 1
DC motor for reel x 1
DC motor for mechanism drive x 1
{For both decks A and B)
Fast forward/
rewind time
: Approx. 110 sec. with C-60 cassette
Input terminals
LINE IN
{x1 circuit)
: Input sensitivity; 80 mV (0 VU)
Input impedance; 50 kQ
MiC x1
(Monaural)
__: Input sensitivity; 0.4m V (-68dBV)
Matching impedance; 600 - 10 kQ
Output terminals
LINE OUT
(x 1 circuit):
Output level; 300 mV (0 VU)
Output impedance; 5 kQ
PHONES x 1
: Output level; 0 - 1 mW/8 Q (0 Vu)
Matching impedance 8 0 - 1 kQ
Other terminals
: COMPU LINK-3/SYNCHRO x 2
Power
requirement
: AC 240 V, 50 Hz (Australia)
AC 230 V, 50 Hz (U.K.)
AC 120 V, 60 Hz (U.S.A)
Power
consumption
; With power switch on 23 W
With power switch standby 4.0 W
Dimensions
(Wx Hx D)
2435 x 134 x 331 mm
(17-3/16" x 5-5/16" x 13-1/16")
Weight
: 4.9 kg (10.9 Ibs.)
Accessories
: Pin plug cord
Remote cable ...
SUONOMISU]
my
INN/ONAAAVY
ONLZEZM-

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