Sharp VC-384N Serviceanleitung Seite 9

WIDING TORQUE CHECK AND ADJUSTMENT
e@ Checking Procedure
1) Remove the cassette housing. Hold the cassette
down switch with PVC tape.
2) Mount a torque gauge on the take-up reel disk. Turn
the torque gauge in normal speed to confirm that the
torque is in the range of (170 + 20)g-cm.
e Adjustment (See Figure 9.)
1) If winding torque during play mode is not as
specified, make adjustment with a variable resistor.
torque control
Figure 9.
CHECK OF FAST-FORWARD-TIME BACK TENSION
Precaution:
1. Mount the torque gauge properly on the reel disk.
If it is not installed firmly, results of measurement
might not be correct.
2. Fast-forward-time back tension is equal to loading
back tension of the supply side. So, this step may not
be performed if loading back tension has been
checked.
©@ Checking Procedure
1) Remove the cassette housing. Hold the cassette
down switch with PVC tape.
2) Depress the fast-forward button.
3) Mount a torque gauge on the supply reel disk.
Turning it counterclockwise slowly (at a speed of a
turn for every 2-3 seconds), check if the reading is in
the range of 10 ~ 20g-cm.
CHECK OF REWIND-TIME BACK TENSION
Precaution:
1. Mount the torque gauge properly on the reel disk.
If it is not installed firmly, results of measurement
might not be correct.
2. Reverse-time back tension is equal to back tension of
V/S-REW. So, this step may not be performed if
back tension of V/S-REW has been checked.
@ Checking Procedure
1) Remove the cassette housing. Hold the cassette
down switch with PVC tape.
2) Depress the rewind button.
3) Mount a torque gauge on the take-up reel disk.
Turning it counterclockwise slowly (at a speed of a
turn for every 2-3 seconds), check if the reading is
below 15g-cm.
CHECK OF VIDEO SEARCH FORWARD TIME
BACK TENSION
Precaution:
1. Check and adjust back tension of V/S FWD time
after adjustment of tension arm position.
2. Mount the torque gauge properly on the reel disk.
If it is not installed firmly, results of measurement
might not be correct.
3. If back tension of V/S FWD time is not in the range
of 10 ~ 20g-cm adjust the auxiliary brake spring.
Then check back tension again.
@ Checking Procedure
1) Remove the cassette housing.
2) Hold the cassette down switch with PVC tape.
3) Depress the play button.
4) Selecting V/S FWD mode by depressing the V/S
FWD button, check that auxiliary brake is acting on
the supply reel disk.
5) Mount a torque gauge on the supply reel disk.
Turning it slowly (at a speed of a turn for every 2-3
seconds), check if the reading is in the range of
10 ~ 20g-cm.
CHECK OF VIDEO SEARCH REVERSE TIME
BACK TENSION
Precaution:
1. Mount the torque gauge properly on the reel disk.
If it is not installed firmly, results of measurement
might not be correct.
2. Back tension of V/S REV time is equal to that of
rewind time. So, this step may not be performed if
back tension of rewind time has been checked.
@ Checking Procedure
1) Remove the cassette housing.
2) Hold the cassette down switch with PVC tape.
3) Depress the play button.
4) Select V/S REV mode by depressing the rewind play
button.
5) Mount a torque gauge on the take-up reel disk.
Turning it slowly (at a speed of a turn for every 2-3
seconds), check if the reading is smaller than 15g-cm.