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PV-9661 / PV-9662
Note:
Do not touch the outside circumference of the rotor surface
with any tool and keep magnetic material away from the
rotor magnet (especially metal particles).
Confirmation of Signal Level
1. Supply a Video Signal to the Video Input Jack.
2. Insert a cassette tape and place the unit in SLP recording
mode.
3. Connect the oscilloscope to Pin 7 of P2502 on the Capstan
Stator Unit.
Confirm that the signal level is greater than 15mVp-p.
6.2.2.4.
P2 AND P3 POST HEIGHT
ADJUSTMENT (PRELIMINARY
ADJUSTMENT)
Purpose:
To properly align the position of the tape
with the Cylinder Lead so that the tape
runs with stability.
Symptom of
Since the Envelope Waveform Signal
Misadjustment:
cannot be tracked properly, the Playback
picture will be poor.
Since the tape does not run smoothly, the
tape will
eventually be damaged.
Tape interchangeability is poor.
Equipment
Post Adjustment Plate (VFKS0010)
Required:
Reel Table Height Fixture (VFKS0009)
Post Adjustment Driver (VFK0329)
1. Remove the Cassette Up Ass'y.
2. Position the Post Adjustment Plate over the reels.
3. Place the fixture on the Post Adjustment Plate and zero the
fixture (DO NOT use the cut-out portion of the post
adjustment plate.)
4. Lower each post below the top edge of the Post Adjustment
Plate. Then, raise each post until it contacts the foot of the
Reel Table Height Fixture. For proper adjustment, the foot
of that should be positioned as shown.
Fig. M5-1
Fig. M5-2
CAUTION:
1. Overtightening P2 and P3 posts may cause the threads to
strip.
2. Upon
completion
"ENVELOPE OUTPUT ADJUSTMENT" procedures.
6.2.2.5.
TAPE INTERCHANGEABILITY
ADJUSTMENT (FINAL
ADJUSTMENT)
Note:
To perform these adjustment/confirmation procedures, set
the tracking to the neutral position.
Equipment
Dual Trace Oscilloscope
Required:
VHS Alignment Tape (VFMS0003H6)
Post Adjustment Driver (VFK0329)
H-Position Adjustment Driver (VFK0330)
6.2.2.5.1.
ENVELOPE OUTPUT
ADJUSTMENT
Purpose:
To achieve a satisfactory picture and
secure precise tracking.
Symptom of
If the envelope is output poorly, much
Misadjustment:
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
Post Adjustment Driver (VFK0329)
Required:
1. Connect the oscilloscope to TP3002 on the Video Signal
Process Section of the Main C.B.A. Use TP6205 as a
trigger.
2. Place a jumper between TP6003 on the Video Signal
Process Section and +5V(TP6009) on the System Control
Section of the Main C.B.A. to defeat Auto Tracking.
3. Eject the tape and insert it again to access the Neutral
Tracking position.
4. Play back the alignment tape and confirm that the RF
envelope appears.
5. With Post Adjust Driver, adjust P2 and P3 post height so
that the envelope waveform (V1/V-max. is 0.7 or more.)
becomes as flat 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.
38
Fig. M5-3
of
this
procedure,
perform
the
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