Toshiba Color Television/ Video cassette recorder MV13K3CR - Manual (Page 24)

MECHANICAL ADJUSTMENTS
1-4: CONFIRMATION OF VSR TORQUE
Operate within 4~5 seconds after the reel disk begins to
turn.
Install the Torque Gauge (JG002F) and Adapter (JG002B)
on the S Reel. Set to the Rewind mode. (Refer to Fig.1-4)
Then, confirm that it indicates 120~180gf•cm. 1.
2.
3.
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)
Set to the STOP mode.
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)
Set to the STOP mode.
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 45~70gf•cm. 1.
2.
3.
4.
Fig. 1-4
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
T Brake Spring/Tension Spring
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.
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 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.
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.
Torque Gauge/Adapter
(JG002F/JG002B)
T Reel
S Reel
Torque Gauge/Adapter
(JG002E/JG002B)
NOTE
After adjustment, confirm and adjust A/C head.
(Refer to item 2-2)
Fig. 2-1-A
Max
A : B = 3 : 2
A
Entrance Exit
Max B
Fig. 2-1-B
CH-2
SW Pulse (TP1002)
CH-1
Track CH-2
Track
CH-1
Envelope
(TP4001)
Envelope
CH-3
Audio
(1)
(2)