S Reel/Tension Band/Tension
Connect/Tension Arm Ass'y
T Reel/T Brake Band//T Brake
Spring/T Brake Arm
D2-2
MECHANICAL ADJUSTMENTS
1-4: CONFIRMATION OF VSR TORQUE
Install the Torque Gauge (JG002F) and Adapter (JG002B)
on the S Reel. Set to the Picture Search (Rewind) mode.
(Refer to Fig.1-4-B)
Then, confirm that it indicates 120~180gf•cm.
1.
2.
NOTE
If the torque is out of the range, replace the following
parts.
Check item
1-4
1-5
Replacement Part
Idler Ass'y/Clutch Ass'y
S Reel side:
T Reel side:
2. CONFIRMATION AND ADJUSTMENT
OF TAPE RUNNING MECHANISM
Tape Running Mechanism is adjusted precisely at the
factory. Adjustment is not necessary as usual. When you
replace the parts of the tape running mechanism because
of long term usage or failure, the confirmation and
adjustment are necessary.
2-1: GUIDE ROLLER
Playback the VHS Alignment Tape (JG001 or JG001B).
(Refer to SERVICING FIXTURE AND TOOLS)
Connect CH-1 of the oscilloscope to TP4001 (Envelope)
and CH-2 to TP1002 (SW Pulse).
Press and hold the Tracking-Auto button on the remote
control more than 2 seconds to set tracking to center.
Trigger with SW Pulse and observe the envelope. (Refer to
Fig. 2-1-A)
When observing the envelope, adjust the Adjusting Driver
(JG005) slightly until the envelope will be flat.
Even if you press the Tracking Button, adjust so that
flatness is not moved so much.
Adjust so that the A : B ratio is better than 3 : 2 as shown in
Fig. 2-1-B, even if you press the Tracking Button to move
the envelope (The envelope waveform will begin to
decrease when you press the Tracking Button).
Adjust the PG shifter during playback.
(Refer to the ELECTRICAL ADJUSTMENTS)
1.
2.
3.
4.
5.
6.
7.
NOTE
After adjustment, confirm and adjust A/C head.
(Refer to item 2-2)
CH-2
SW Pulse (TP1002)
CH-1
Track
CH-2
Track
CH-1
Envelope
(TP4001)
Fig. 2-1-A
Entrance
Exit
Max
A
Max
B
Fig. 2-1-B
NOTE
Install the Torque Gauge on the reel disk firmly. Press the
REW button to turn the reel disk.
1-5: CONFIRMATION OF REEL BRAKE TORQUE
(S Reel Brake) (Refer to Fig. 1-4-B)
Once set to the Fast Forward mode then set to the Stop
mode. While, unplug the AC cord when the Pinch Roller
Block is on the position of Fig. 1-4-A.
Move the Idler Ass'y from the S Reel.
Install the Torque Gauge (JG002F) and Adapter
(JG002B) on the S Reel. Turn the Torque Gauge
(JG002F) clockwise.
Then, confirm that it indicates 60~100gf•cm.
1.
2.
3.
4.
(T Reel Brake) (Refer to Fig. 1-4-B)
Once set to the Fast Forward mode then set to the Stop
mode. While, unplug the AC cord when the Pinch Roller
Block is on the position of Fig. 1-4-A.
Move the Idler Ass'y from the T Reel.
Install the Torque Gauge (JG002E) and Adapter
(JG002B) on the T reel. Turn the Torque Gauge
(JG002E) counterclockwise.
Then, confirm that it indicates 30~50gf•cm.
1.
2.
3.
4.
Torque Gauge/Adapter
(JG002F/JG002B)
T Reel
S Reel
Torque Gauge/Adapter
(JG002E/JG002B)
Fig. 1-4-A
The position at FF mode.
The position at
STOP mode.
Cassette
Opener
Pinch Roller Block
Capstan DD Unit
Cassette Holder Ass'y
Stop at this position.
Fig. 1-4-B
A : B
≥
3 : 2
