Panasonic PV-D301 Service Manual page 85

Note:
It will be possible to confirm step 4) after performing the following
steps.
A. Exit the "I. TRACKING FIX" mode, then skip the "J. PG
SHIFTER" mode to enter other modes (except these 2). Or, close
the service mode.
B. Press the Tracking Control Up or Down button on the
camcorder. Make sure that the envelope waveform remains flat.
If not, readjust S and/or T post heights.
5. After adjustment, confirm that the tape travels without curing at S
and T posts.
If curing is apparent, readjust the height of posts.
8.2.2.1.2. A/C HEAD HEIGHT ADJUSTMENT
The height of the A/C Head replacement part is preset at the factory.
Purpose:
To be sure the tape runs properly along the Control Head.
Symptom of Misadjustment:
If the control signal is not properly picked up, Servo Operation can
not be achieved.
1. Connect the oscilloscope to Pin 25 (PB Control signal) on the TP
Adjustment P.C.B.
2. Play back the Alignment Tape (VFMW0001C)
3. Confirm that the Sub Control Signal is 500 mV200 mV. If not,
Fig. M3-3
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