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Improper
(a) Guide roller
(b) Guide pole
Fig.3-3-2b
3.3.3 Height and tilt of the A/C head
Note:
• Set a temporary level of the height of the A/C head in ad-
vance to make the adjustment easier after the A/C head has
been replaced. (See Fig.3-2-6c.)
Signal
(A)
• Alignment tape(SP, stairstep, NTSC) [MHP]
Mode
(B)
• PB
Equipment
(C)
• Oscilloscope
Measuring point (D1)
• AUDIO OUT terminal
(D2)
• TP4001 (CTL. P)
External trigger (E)
• TP111 (D.FF)
Adjustment part (F)
• A/C head [Mechanism assembly]
Specified value (G) • Maximum waveform
(1) Play back the alignment tape (A).
(2) Apply the external trigger signal to D.FF (E), to observe the
AUDIO OUT waveform and Control pulse waveform at the
measuring points (D1) and (D2) in the ALT mode.
(3) Set the VCR to the manual tracking mode.
(4) Adjust the AUDIO OUT waveform and Control pulse wave-
form by turning the screws (1), (2) and (3) little by little until
both waveforms reach maximum. The screw (1) and (3) are
for adjustment of tilt and the screw (2) for azimuth.
Head base
(2)
(1)
A/C head
(3)
Fig.3-3-3a
3.3.4 A/C head phase (X-value)
Signal
(A1) • Alignment tape(SP, stairstep, NTSC) [MHP]
Mode
(B)
• PB
Equipment
(C)
• Oscilloscope
Measuring point (D)
• TP106 (PB. FM)
External trigger (E)
• TP111 (D.FF)
Adjustment part (F)
• A/C head base [Mechanism assembly]
Specified value (G) • Maximum V.PB FM waveform
Adjustment tool (H)
• A/C head positioning tool [PTU94010]
(1) Play back the alignment tape (A1).
(2) Apply the external trigger signal to D.FF (E), to observe the
V.PB FM waveform at the measuring point (D).
(3) Set the VCR to the manual tracking mode.
(4) Loosen the screws (4) and (5), then set the A/C head posi-
tioning tool to the innermost projected part of the A/C head.
(See Fig. 3-3-4a.)
(5) Turn the A/C head positioning tool fully toward the capstan.
Proper
(6) Perform the tracking operation and make sure that the
Note:
• After adjusting, always perform the confirmation and re-
adjustment of the item 3.3.5.
AUDIO OUT
CTL. P
3.3.5 Standard tracking preset
Signal
Mode
Equipment
Measuring point (D)
External trigger (E)
Adjustment part (F)
Specified value (G) • STOP mode
Adjustment tool (H)
(1) Play back the alignment tape (A).
(2) Apply the external trigger signal to D.FF (E), to observe the
(3) Confirm that the automatic tracking operation is completed.
(4) Set the VCR to the Auto adjust mode by transmitting the
(5) If the VCR enters the eject mode, perform adjustment for
Then turn it back gradually toward the drum and stop on the
second peak point position of the V.PB FM waveform out-
put level. Then tighten the screws (4) and (5).
V.PB FM waveform is at its maximum.
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 maxi-
mum for the first time. Then tighten the screws (4) and (5).
Toward the drum
A/C head positioning tool
To the drum
A/C head
Fig.3-3-4a
Alignment tape
[SP, stairstep]
played with the
SP head
X-value adjustment point
Drum side
Control head position
Fig.3-3-4b
(A)
• Alignment tape(EP, stairstep, NTSC) [MHP-L]
(B)
• PB
Auto adjust
(C)
• Oscilloscope
• TP106 (PB. FM)
• TP111 (D.FF)
• Jig RCU: Code "50"
(Maximum V.PB FM waveform)
• Jig RCU [PTU94023B]
V.PB FM waveform at the measuring point (D).
code (F) twice from the Jig RCU. When the VCR enters the
stop mode, the adjustment is completed.
the audio control head phase (X-value) again.
Toward the capstan
Head base
Screw (4)
Screw (5)
To the capstan
Alignment tape
[EP(LP), stairstep]
played with the
EP(LP) head
Capstan side
Maximum
(No.82933)1-29
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