Sharp VC-H92HM Serviceanleitung Seite 18

@ Adjustment
1. If the take-up torque is outside the range, clean
the capstan D.D. motor pulley, reel belt and reel
pulley with cleaning liquid, then recheck the
torque.
2. If the take-up torque is still out of range, replace
the reel belt.
Notes:
1. Hold down the torque gauge so that it may not
fly off.
2. When checking the take-up torque, do not keep
the reel disk locked for a longer time.
CHECKING AND ADJUSTMENT OF TAKE-UP
TORQUE IN PLAYBACK MODE
1. Remove the cassette housing control assembly.
2. Make a short-circuit between TP5001 (or jumper
pin 241) and TP5002 (or jumper pin 242) , both
located at the left on your side on the main PWB,
with a 22 ohm resistor. Now turn on the power.
3. Open the lid of the cassette torque meter, and
hold it with two pieces of vinyl tapes.
4. Load the cassette torque meter into the unit.
5. Put the weight (500g) on the cassette torque me-
ter.
6. Press the REC button to put the unit in REC
mode.
Set value SP 8.8 + 3.8mN-m (90 + 39gf-cm)
Figure 4-10.
@ Checking
1. Check that the torque is in the range of 8.8+
3.8mN-m (90 + 39gf-cm).
2. The torque fluctuates due to the rotational devi-
ation of the reel pulley ass'y. Use the center of
the fluctuation as the value.
3. Place the ass'y in the SP record mode, and check
that the take-up torque is within the range.
@ Adjustment
If the take-up torque in the playback mode is out-
side the range, replace the reel pulley ass'y.
Note:
Stabilize the cassette torque meter to prevent
floating.
VC-H91GM
VC-H3S1SM
VC-H92GM
CHECKING AND ADJUSTMENT OF TAKE-UP
TORQUE IN VIDEO SEARCH REWIND MODE
@ Remove the cassette housing control assembly.
@ Make a short-circuit between TP5001 (or jumper
pin 241) and TP5002 (or jumper pin 242) , both
located at the left on your side on the main PWB,
with a 22 ohm resistor. Now turn on the power.
@ Setting
. Push the PLAY button to place the ass'y in the
playback mode.
2. Push the REW button to place the ass'y in the vid-
eo search rewind mode.
—_
@ Checking
1. Place the torque gauge on the supply reel disk,
and turn it counterclockwise very slowly (one ro-
tation every 1 to 2 seconds) and check that the
torque is within the set value 14.5 *8 mN-m (148
+8 gf-cm)
Torque gauge
Supply reel disk _ _
Figure 4-11.
Note:
Set the torque gauge securely on the supply reel
disk. If it is not secure, the measurement will be in-
correct.
@ Adjustment
If the take-up torque in video search rewind mode
is outside the range, replace the reel pulleyass'y.
Note:
The torque fluctuates due to the rotational devi-
ation of the reel pulley ass'y. Use the center of the
fluctuation at the value.