Sharp VC-M23SM Servicehandbuch Seite 16

CHECKING: : THE=VIDEO:.. SEARCH: REWIND:
BACK: TENSION: j2.; OY yh Gog iea P
Remove the. cassette housing control assemblyx1:i > -
¢ Make: a.short-circuit-between TP5005 and TP5006;: both -
. located atthe lefton your side on the main PWB. Now turn
on the power. Sowers gah ia
* Checking Paeioe. s
.. Pushthe PLAY button to place the ass'y in the playback mode.
2. Push the rewind button to place the ass'y in the-video search .
rewind mode. PT cts
3. Place the torque gauge on the take-up reel disk, and turn it
counterclockwise very slowly (one rotation every: 2:to. 3-sec-
_onds} and.check that the torque is within the set value
-:9:0+1mN-m. (31+440gf-em). _ eat at at
ss
Torque gauge
oe aos a
Take-up reel saree
Figure 4-12.
Notes:
1 Set the torque gauge securely on the take-up reel disk. If itis
not secure, the measurement will be incorrect.
2 Measure the torque applying the torque gauge's weight.
CHECKING THE PINCH ROLLER PRESSURE
* 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.
* Checking . ;
Push the PLAY button to place the ass'y in the playback mode.
16
_ Capstan shaft
4.
Tension gauge |
1,000 - 1,200g |
Pinch roller
Tension gauge adapter
Figure 4-1 3.
. Detach the pinch roller from the capstan shaft.
. Set thé tension gauge by hooking the tension gauge adapter
"© @nto the pinch roller shaft. co * Ra
. Gradually release the pressure to allow the pinch roller to
touch the capstan shaft. When the pinch roller just touches the
capstan shaft, read the indication on the gauge.
Check that the reading of the tension gauge is in the range of
900 to 1200 g.
CHECKING AND ADJUSTMENT OF TENSION
P
G Nh
OLE POSITION
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. Nowturn
on the power.
Setting
. Open the lid of cassette tape (E-180), and hold it with two
pieces of vinyl tapes. —
. Load the cassette tape into the unit.
. Put the weight (500g) on the cassette tape.
. Make the adjustment with the beginning of a E-180 tape.
Cassette tape
Weight to prevent
float (500g)
Figure 4-14,
Checking
. Set a cassette tape, press the REC button and get the tape
loaded. Now check the tension pole position.