Read Sharp DV-NC65H (serv.man13) Service Manual online
30
DV-NC65H/S
DV-NC70H
DV-NC70H
8-12. CHECKING THE VIDEO SEARCH REWIND
BACK TENSION
•
Remove the cassette housing control assembly.
•
After short-circuiting between TP803 and TP802 pro-
vided at VCR Operation PWB, plug in the power cord.
vided at VCR Operation PWB, plug in the power cord.
•
Checking
1. After pressing the play button, press the rewind button,
and set the video search rewind mode.
2. Place the torque gauge on the take-up 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 3.7
3 seconds) and check that the torque is within the set
value 3.7
± 1.5mN⋅m (38 ± 15gf⋅cm).
Figure 8-11.
Torque gauge
Take-up reel disk
Note:
Set the torque gauge securely on the take-up reel disk.
If it is not secure, the measurement will be incorrect.
If it is not secure, the measurement will be incorrect.
8-13. C H E C K I N G T H E P I N C H R O L L E R
PRESSURE
* Checking can be perform with or without cassette
housing control.
• Remove the cassette housing control assembly.
• After short-circuiting between TP803 and TP802 pro-
• After short-circuiting between TP803 and TP802 pro-
vided at VCR Operation PWB, plug in the power cord.
• Checking
Press the play button to set the playback mode.
Press the play button to set the playback mode.
CCW
Figure 8-12.
1. Detach the pinch roller from the capstan shaft.
Do not separate excessively. Or the pinch lever and
pinch double action lever may disengage.
pinch double action lever may disengage.
2. Engage the tension gauge adapter with the pinch roller
shaft, and pull in the arrow direction.
3. Gradually return the pinch roller, and measure the
pulling force when the pinch roller contacts the capstan
shaft.
shaft.
4. Make sure that the measured value is within setting
change to 9.8
± 2N (1.0 ± 0.2kgf).
8-14. CHECKING AND ADJUSTMENT OF
TENSION POLE POSITION
•
Setting (with cassette control housing)
1. Insert cassette tape (E-180)
2. Make the adjustment with the beginning of a E-180 tape.
2. Make the adjustment with the beginning of a E-180 tape.
Pinch roller
Tension gauge
900 - 1,200gf
900 - 1,200gf
Capstan shaft
Tension gauge adapter
Figure 8-13.
(E-180)
Click on the first or last page to see other DV-NC65H (serv.man13) service manuals if exist.