Sharp VC-90ET Service Manual page 17

CHECKING AND ADJUSTMENT OF TAKE-UP
TORQUE IN PLAYBACK MODE _ _ .
1. Remove the cassette housing control assembly.
2. Open the lid of the cassette torque meter, and
hold it with a piece of vinyl tape.
Vinyl tapes
Set value LP 95 +30g.cm aN
? 7
. ¢
Figure 1-31.
@ Checking
1. Check that the torque is in the range of 95 + 30
g.cm.
2. The torque fluctuates due to the rotational
deviation of the reel drive unit. Use the center of
the fluctuation as the value.
3. Place the unit in the LP 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 take-up reel disk.
Note :
Weight the cassette torque meter to prevent
floating.
Place the torque gauge on the supply reel
disk, and turn it counterclockwise very slowly
{one rotation every 2 to 3 seconds) and check
that the torque is within the set value
170+ 40 g-cm.
17
VC-390ET
CHECKING AND ADJUSTMENT OF TAKE-UP
TORQUE IN VIDEO SEARCH REWIND MODE
@ Remove the cassette housing contro! assembly.
®@ Checking
Push the play button to place Push the video search rewind
the unit in the playback mode. button to place the unit in the
video search rewind mode
Torque gauge
Supply reel disk
Figure 1-32.
' Note:
Set the torque gauge securely on the supply reel
disk. If it is not secure, the measurement will be
incorrect.
@ Adjustment
If the take-up torque in video search rewind mode
is outside the range, replace the supply reel disk.
Note:
The torque fluctuates due to the rotational
deviation of the supply reel disk. Use the center of
the fluctuation at the value.