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2-1. Servo Circuit
2-1-1.
Test point:
BW005
Ps034
bo 0
®
IToos
[4
q@)
aif
IT002
BT001
'to01 C68)
'O)
60)
@
ITO01
Main PC Board
BX102
iNo0o1
3
©)
Terminal PC Board
Playback Phase (PG) Adjustment
BW005, Pin 19 of BX102 (Video out)
Test equipment: Oscilloscope
1. Play back the alignment tape. Confirm that phase
difference between the fall of the DFF pulse (pin 3 of
BW005) and the rise of CTL pulse (pin 4 of BW005)
is 12 + 0.5 ms.
waveform, and confirm that the ACE head position
adjustment and linearity adjustment have been made,
and C-S YNC (pin 70 of ITOO1) is being input during
playback,
. Set the VTR to the STOP mode.
2-45
DFF pulse
:
| 6.5 + 0.5H
(
'
Video out
| | | |
|
i
i
CTL pulse
;
!
1
1
1
12.0+0.5 ms
4. Press the unit's channel up/down buttons simulta-
neously for more than 5s.
. Afterwards, within 2s, press the PLAY button on the
remote control unit.
6. The automatic adjustment will be made for about 10s,
all the displays will blink. If the automatic adjustment
is not carried out, confirm that the alignment tape has
a safety tab or not, and redo from the step 3.
1) When adjustment has been completed:
The display will blink for 10s, stop blinking and
return to the normal display in the STILL mode,
then it shifts to the playback display in the play-
back mode.
2) When adjustment fails:
It goes into the STOP mode.
. Confirm that the play indicator is displayed, and
confirm that the rising and falling edge of the SW
pulse is 6.5 + 0.5H from the V-sync front edge of the
video signal.
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