Confirmation And Adjustment Of Tape Running Mechanism - Toshiba MV19K2 Service Manual

1-4: CONFIRMATION OF VSR TORQUE
1. Operate within 4~5 seconds after the reel disk begins to
turn.
2. Install the Torque Gauge (JG002F) and Adapter (JG002B)
on the S Reel. Set to the Rewind mode. (Refer to Fig.1-4)
3. Then, confirm that it indicates 120~180gf•cm.
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)
1. Set to the STOP mode.
2. Move the Idler Ass'y from the S Reel.
3. Install the Torque Gauge (JG002F) and Adapter
(JG002B) on the S Reel. Turn the Torque Gauge
(JG002F) clockwise.
4. Then, confirm that it indicates 70~100gf•cm.
(T Reel Brake) (Refer to Fig. 1-4)
1. Set to the STOP mode.
2. Move the Idler Ass'y from the T Reel Ass'y.
3. Install the Torque Gauge (JG002E) and Adapter
(JG002B) on the T reel. Turn the Torque Gauge
(JG002E) counterclockwise.
4. Then, confirm that it indicates 35~60gf•cm.
Torque Gauge/Adapter
(JG002F/JG002B)
S Reel
NOTE
If the torque is out of the range, replace the following
parts.
Check item
1-4 Idler Ass'y/Clutch Ass'y
1-5 T Brake Spring/Tension Spring
MECHANICAL ADJUSTMENTS
Torque Gauge/Adapter
(JG002E/JG002B)
T Reel Ass'y
Fig. 1-4
Replacement Part
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
1. Playback the Alignment Tape.
2. Connect CH-1 of the oscilloscope to TP4001 (Envelope)
and CH-2 to TP1002 (SW Pulse).
3. Press and hold the TRACKING-AUTO button on the
remote control more than 2 seconds to set tracking to
center.
4. Trigger with SW Pulse and observe the envelope. (Refer
to Fig. 2-1-A)
5. When observing the envelope, adjust the Taper Nut
Driver slightly until the envelope will be flat.
Even if you press the Tracking Button, adjust so that
flatness is not moved so much.
6. 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).
7. Adjust the PG shifter during playback.
(Refer to the ELECTRICAL ADJUSTMENTS)
NOTE
After adjustment, confirm and adjust A/C head.
(Refer to item 2-2)
CH-1
Envelope
(TP4001)
CH-2
SW Pulse (TP1002)
Envelope
(1)
CH-3
Audio
(2)
Entrance
Max
A
CH-1 CH-2
Track
Track
Fig. 2-1-A
Exit
Max
B
A : B = 3 : 2
Fig. 2-1-B