NOTE
If the torque is out of the range, replace the following parts.
12.2. 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 adjust-ment are necessary.
12.2.1. GUIDE ROLLER
1. Playback the VHS Alignment Tape (JG001).
(Refer to SERVICING FIXTURE AND TOOLS)
2. Connect CH-1 of the oscilloscope to TP4001 (Envelope) and CH-2
to TP1002 (SW Pulse).
3. Press and hold the ATR 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 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.
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
40
