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[Perform adjustment steps (7) to (10) only for 2 Head
models equipped with LP mode.]
(7) Then play back the alignment tape (A2).
(8) Set the VCR to the manual tracking mode.
(9) Perform the tracking operation and make sure that the
V.PB FM waveform is at its maximum.
(10) If it is not at maximum, loosen the screws (4) and (5),
and turn the A/C head positioning tool to bring the A/C
head to a position, around where the waveform reaches
its maximum for the first time. Then tighten the screws
(4) and (5).
Note:
• After adjusting, always perform the confirmation and
re-adjustment of the item 2.3.4.
Toward the capstan
Toward the drum
Head base
A/C head positioning tool
Screw (4)
To the drum
Screw (5)
A/C head
To the capstan
Fig. 2-3-3a
Alignment tape
Alignment tape
[SP, stairstep]
[EP(LP), stairstep]
played with the
played with the
SP head
EP(LP) head
X-value adjustment point
Drum side
Control head position
Capstan side
Maximum
Fig. 2-3-3b
2.3.4 Standard tracking preset
•
Signal
(A)
Alignment tape(LP, stairstep, PAL) [MHPE-L]
•
PB ¥ Auto adjust
Mode
(B)
•
Equipment
(C)
Oscilloscope
•
Measuring point (D)
TP106 (PB. FM)
•
External trigger
(E)
TP111 (D.FF)
•
Adjustment part
(F)
Jig RCU: Code “50”
•
Specified value
(G)
STOP mode
(Maximum V.PB FM waveform)
•
Adjustment tool
(H)
Jig RCU [PTU94023B]
(1) Play back the alignment tape (A).
(2) Apply the external trigger signal to D.FF (E), to observe
the V.PB FM waveform at the measuring point (D).
(3) Confirm that the automatic tracking operation is com-
pleted.
2-18
(4) Set the VCR to the Auto adjust mode by transmitting the
code (F) twice from the Jig RCU. When the VCR enters
the stop mode, the adjustment is completed.
(5) If the VCR enters the eject mode, perform adjustment for
the audio control head phase (X-value) again.
2.3.5 Tension pole position
•
Signal
(A)
Back tension cassette gauge
[PUJ48076-2]
•
Mode
(B)
PB
•
Adjustment part
(F)
Adjust pin [Mechansim assembly]
25 - 51 gf•cm (2.45 – 5 × 10
•
Specified value
(G)
-3
Nm]
(1) Play back the back tension cassette gauge (A).
(2) Check that the indicated value on the left side gauge is
within the specified value (G).
(3) If the indicated value is not within the specified value (G),
perform the adjustment in a following procedure.
1) Set the VCR to the mechanism service mode. (See
SECTION 1 DISASSEMBLY.)
2) Set the VCR to the play back mode and adjust by turn-
ing adjustment pin to align the tension arm assembly
edge with the main deck hole (A) on the right edge
marker. (See Fig. 2-3-5a)
Tension arm
assembly
Edge
Hole (A)
Marker
Adjust pin
0.5 mm
Tension arm assembly
Tension brake assembly
Fig. 2-3-5a
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