Panasonic PV-DF2700-K, Service Manual, Page: 114 / 398

Note:
To perform these adjustment/confirmation procedures, set the tracking to the
neutral position.
Equipment Required:
Dual Trace Oscilloscope
VHS Alignment Tape (VFMS0003H6)
Post Adjustment Driver (VFK0329)
H-Position Adjustment Driver (VFK0330)
7.2.2.3.1. ENVELOPE OUTPUT ADJUSTMENT
The height of the P2 and P3 Posts replacement part is preadjust at the factory.
Purpose:
To achieve a satisfactory picture and secure precise tracking.
Symptom of Misadjustment:
If the envelope is output poorly, much noise will appear in the picture. Then the
tracking will lose precision and the playback picture will be distorted by any
slight variation of the tracking control circuit.
Equipment Required:
Post Adjustment Driver (VFK0329)
1. Place a jumper between TP6003 and +5V(TP6009) on the Main C.B.A. to defeat
Auto Tracking.
2. Eject the tape and insert it again to access the Neutral Tracking position.
3. Play back the alignment tape.
4. Connect the oscilloscope to TP3002 on the Video Signal Process Section of the
Main C.B.A. Use TP6205 as a trigger.
5. Confirm that the RF envelope is flat enough (V1/V-max. is 0.7 or more). If not,
with Post Adjustment Driver, adjust P2 and P3 post height so that the envelope
waveform becomes as flat (V1/V-max. is 0.7 or more) as possible (No envelope
drop). If the envelope drop appears on the left-half of the waveform, adjust P2
post height. If the envelope drop appears on the right-half of the waveform,
adjust P3 post height.
CAUTION:
Overtightening P2 and P3 posts may cause the threads to strip.
Note:
It will be possible to confirm Step 5 according to following steps.
A. Press the Tracking Control Up or Down button on remote control. Make sure
that the envelope waveform remains flat. If not, readjust P2 and/or P3 post
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