Checking And Adjustment Of Take-Up Torque In Playback Mode - Sharp VC-M23SM Servicehandbuch

¢ Adjustment
1. If the take-up torque is outside the range, clean the capstan
D.D. motor pulley, drive belt and limiter puiley with cleaning
liquid, then recheck the torque.
2. Ifthe take-up torque is still out of range, replace the drive 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 TP5005 and TP5006, both
located at the left on your side on the main PWB. Now turn on
the power.
3. Open the lid of the cassette torque meter, and hold it with two
pieces of vinyl tapes.
. Load the cassette torque meter into the unit.
. Put the weight (500g) on the cassette torque meter.
. Press the REC button to put the unit in REC mode.
Ooms
Set value SP 12+3.8mN-m (122 + 39gf-cm)(VC-M23SM/M231SM)
Set value LP 10.543.8mN-m (107 +39gf-cm)(VC-M43SM/M431 SM)
Figure 4-10.
e Checking
1. Check that the torque is in the range of 12 + 3.8mN-m (122 +
39gf-cm) (VC-M23SM/M231SM) or 10.5 + 3.8mN-m (107 +
39gf-cm) (VC-M43SM/M431SM)}.
2. The torque fluctuates due to the rotational deviation of the
limiter pulley ass'y. Use the center of the fluctuation as the
value.
3. Place the ass'y in the SP (VC-M23SM/M231SM) or LP (VC-
M43SM/M431SM) record mode, and check that the take-up
torque is within the range.
* Adjustment
If the take-up torque in the playback mode is outside the range,
replace the limiter pulley ass'y.
Note:
_ Stabilize the cassette torque meter to prevent floating.
CHECKING AND ADJUSTMENT OF TAKE-UP
TORQUE IN VIDEO SEARCH REWIND MODE
Remove the cassette housing control assembly.
* Make a short-circuit between TP5005 and TP5006, both
located at the left on your side on the main PWB. Now turn
on the power.
* Setting :
1. 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 video search
rewind mode.
* Checking
1. Place the torque gauge on the supply ree! disk, and turn it
counterclockwise very slowly (one rotation every 1 to 2 sec-
onds) and check that the torque is within the set value 14.0 +
3.9mN-m (144 + 40gf-cm).
Torque AS que gauge »
lZ
Supply reel disk
Figure 4-11.
Note:
Set the torque gauge securely on the supply ree! disk. If itis not
secure, the measurement will be incorrect.
e Adjustment
If the take-up torque in video search rewind mode is outside the
range, replace the limiter pulley ass'y.
Note:
The torque fluctuates due to the rotational deviation of the limiter
pulley ass'y. Use the center of the fluctuation at the value.
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