Sharp VC-H92HM Serviceanleitung Seite 19

VC-H91GM(B
VC-H91SM(B
VC-H9S2GM(B
K)
K)
K)
CHECKING THE FAST FORWARD BACK
TENSION
Remove the cassette housing control assembly.
Make a short-circuit between TP5001 (or jumper
pin 241) and TP5002 (or jumper pin 242) , both
located at the left on your side on the main PWB,
with a 22 ohm resistor. Now turn on the power.
Checking
1. Push the FF button to place the ass'y in the
fast forward mode.
2. Place the torque gauge on the supply reel
disk, and turn it clockwise very slowly (one ro-
tation every 2 to 3 seconds) and check that the
torque is 1.5+0.9mN-m (15 + 9gf-cm).
zy
Torque gauge
Supply reel disk
pee"
Figure 4-12.
Note:
@ Set the torque gauge securely on the supply reel
disk. If the torque gauge is not securely set on
the reel disk, measurement will be incorrect.
@ Measure the torque with the torque gauge's
weight exerted on the reel disk.
CHECKING THE REWIND BACK TENSION
Remove the cassette housing control assembly.
Make a short-circuit between TP5001 (or jumper
pin 241) and TP5002 (or jumper pin 242) , both
located at the left on your side on the main PWB,
with a22 ohm resistor. Now turn on the power.
Checking
1. Push the REW buton to place Place the ass'y in
the 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 1.3 + 0.8 mN-m (13+
8gf-cm). yw
S&S)
Torque gauge Loy,
SEY,
Take-up reel disk
Figure 4-13.
Note:
@ Set the torque gauge securely on the take-up
reel disk. If it is not secure, the measurement will
be incorrect.
@ Measure the torque with the torque gauge's
weight exerted on the reel disk.
CHECKING THE VIDEO SEARCH REWIND
BACK TENSION
@ Remove the cassette housing control assembly.
@ Make a short-circuit between TP5001 (or jumper
pin 241) and TP5002 (or jumper pin 242) , both
located at the left on your side on the main PWB,
with a 22 ohm resistor. Now turn on the power.
Checking
. Push the 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.
3. Place the torque gauge on the take-up reel disk,
and turn it counterclockwise very slowly (one ro-
tation every 2 to 3 seconds) and check that the
torque is within the set value 4+ 1.7mN-m
(41 + 17gf-cm). :
— @
Figure 4-14,
Note:
@ Set the torque gauge securely on the take-up
reel disk. If it is not secure, the measurement will
be incorrect.
@ Measure the torque with the torque gauge's
weight not exerted on the reel disk.
CHECKING THE PINCH ROLLER PRESSURE
© Remove the cassette housing control assembly.
@ Make a short-circuit between TP5001 (or jumper
pin 241) and TP5002 (or jumper pin 242) , both
located at the left on your side on the main PYWB,
with a 22 ohm resistor. Now turn on the power.
@ Checking
Push the PLAY button to place the ass'y in the
playback mode.