VL-PDl U
8-3. Preparation for tape running adjustment
Meters, jig . . . Oscilloscope, Adjustment remote control, Height adjustment screw driver, Alignment tape (For tape running
adjustment, colour bar), Master plane, Height adjustment jig.
(1)Remove the cassette controller assembly.
(2)Clean the tape running surface (especially, adequately clean the drum surface and the lower drum helicam
surface).
(3)Connect an oscilloscope to each TP on the relay circuit board.
(4)Turn the AC adapter power ON.
(5)Using the adjustment remote control unit, put the system into TEST mode T-05.
(6)Replay the alignment tape for running adjustment, and make sure that the tape is running in the SP mode.
(7)Check the oscilloscope playback envelope, then, at +I/4 shift and -l/4 shift, check whether all of it is flat. If it is not,
perform the following adjustment so that it becomes flat.
(Each time you push the PLAY key, the, shift will change; +I/4 shift -+ Normal + -l/4 shift --+ Normal, in order.)
Sup guide roller
Tu guide roller
Tu guide
8-2
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