Sharp VC-MH80 Service Manual page 19

adjusted with a cassette in place because the cam
will be located below the cassette. Repeat a
series of steps; empty loading, adjustment,
cassette placement and position checking.
tension pole to the right (in the black-arrow
direction). Turn it counterclockwise to move the
tension pole to the left (in the white-arrow
direction).
Adjustable range of the tension pole positioning
cam.
Tension arm shaft
Tension pole adjusting cam
Adjust the tension pole positioning cam so that the
arrow mark on the cam be within 90" left and right
from the tension arm shaft' s center.
CHECKING AND ADJUSTMENT OF
RECORD / PLAYBACK BACK TENSION
l Remove the cassette housing control assembly.
l
Make a short-circuit between TPSOOI and
TP5002, both located on the timer PWB. Now
turn on the power.
1. Open the lid of the cassette torque meter, and
hold it with two pieces of vinyl tapes.
2. Load the cassette torque meter into the unit.
3. Put the weight (5009) on the cassette torque me-
ter.
l Checking
1. Push the REC button to place
record mode.
2. Check that the back tension indicated by the
gauge is within the set range 31 to 38 g-cm.
Notes:
1. Make sure that the video cassette tape is over
the retaining guide.
2. Make sure that the tape is not slack nor
maged at either end.
l
1. If the reading of the cassette torque meter is less
than specified, move the tension spring hook to-
ward A.
2. If the reading of the cassette torque meter is
more than specified, move the tension spring
hook toward B.
19
Cassette torque
meter
the unit in the
d a -
Tension spring