7.2.2.3. TAPE INTERCHANGEABILITY
ADJUSTMENT
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
TV/VCR 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 TV/VCR 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 heights.
Fig. M4-1
Fig. M4-2
6. After adjustment, confirm that the tape travels without
curling at P2 and P3 posts.
Fig. M4-3
7. Remove the jumper after completing the adjustment
procedure.
43
PVQ-1310 / PV-C1320 / PV-C1330W / VV-1300 / VV-1310W / PV-C1340 / PV-C1350W / PV-C2010 / PV-C2020 / PV-C2030W / VV-2000 / PV-C2060
