JVC KD-A11 - Page 10

KD-A11A/B/C/E/J/U |
Adjusting | Standard
point value
Adjusting motor Connect a speed meter to the LINE Semi-fixed| 3000 Hz_ | If the speed meter functions as a wow
speed OUT terminals. Play back the VTT- resistor in and flutter meter, also, connect the
656 test tape Adjust the semi-fixed the motor deck to the INPUT terminals of the
resistor in the motor until the read- meter.
ing of the speed meter is 3000 Hz.
Checking
play-
Employ
a
torque
testing
cassette
tape
If
the
standard
torque
is
not
obtained,
back
torque
for
the
checking,
or
remove
the
cas-
replace
the
take-up
reel
disc
assembly.
sette
cover
and
use
a
torque
gauge.
Checking
fast
Measure
the
torque
in
the
fast
forward
More
than
|
If
the
standard
torque
is
not
obtained,
forward
torque
mode
in
the
same
manner
as
in
the
80
gr-cm
|
perform
the
following.
above.
1.
Clean
the
capstan
belt,
the
idler
cir-
cumference,
the
motor
pulley,
the
take-up
reel
disc
circumference,
the
flywheel
circumference,
etc.
.
Replace
the capstan
belt
or
idler
ass’y.
Checking
rewind
Measure
the
torque
in
the
rewind
More
than
|
If
the
standard
torque
is
not
obtained,
.
torque
mode
in
the same
manner
as in
the
80
gr-cm_ |
clean
the capstan
belt,
idler,
motor
above.
pulley,
flywheel
circumference,
supply
reel disc
circumference,
etc.
[111] Repair of wow flutter
If wow and flutter increase, check the following points. If tions.
there
is
defect
in
revolving
parts,
the
wow
and
flutter
gener-
Play
a
3000
Hz
test
tape,
and
defective
part
can
be
detected
ated will increase in proportion to the number of revolu- from the sound.
Replace flywheel.
Clean the capstan shaft in the flywheel.
Replace the capstan assembly.
Capstan shaft has excessive run-out.
Flywheel! turns heavily.
(shaft seisure, thrust play, etc.)
Pinch roller Rough rotation (Deformation scratches, | Replace pinch roller, or pinch roller spring.
or dust) Clean the pinch roller.
The angular position of the pinch roller | Adjust the pinch roller so that it is parallel with the capstan shaft.
is not correct.
The pinch roller pressure is not correct.
Belt Belt has undue run-out. Check the belt.
Belt is dirty or slippery. Replace the belt.
Back tension | Back tension is irregular, or back ten- Replace back compression spring (under supply disc).
sion is too strong.
Motor Motor shaft has undue run-out. Replace motor.
Motor pulley is oily and dustry. Clean motor pulley.
Capstan and
flywheel
No.
4192
—10—