Table of Contents
Advertisement
11-5-2.
ACE head adjustment
Height adjustment
and azimuth adjustment.
Connection:
Oscilloscope
~TP-182
(Pre-AMP. unit) and the ground.
Adjustment
(Envelope)
Oscilloscope
~TP-183
(Pre-AMP.
unit) and the ground.
(Switching
Pulse)
Special Nut for ACE Head Height
Adjustment
I
Oscilloscope
C$Audio monitor out terminal and the groum
Azimuth Adjustment
I
(1) Load the alignment tape (VHJ-0009)
and set the PLAY mode.
(2) Monitor the audio output waveform with the oscilloscope.
(3) Rotate the azimuth
adjustment
screw
until the audio
output
waveform amplitude is maximum.
(4) After loosening
the ACE head height adjustment
special
nut,
rotate it slowly
clockwke
until amplitude
of the audio output
waveform
is maximum,
then adjust
it finely clockwise
to the
point
just
before
the
said
waveform
amplitude
begins
to
decrease.
Screw
\
1
(5) Rotate
the azimuth
adjustment
screw
until amplitude
of the
audio output waveform
is maximum.
(6) Confirm
that the audio output waveform
amplitude
does not
'/
fluctuate.
(Do not adjust as these screws have been fine
adjusted at the factory,)
Tracking (X value) adjustment
Connection:
Oscilloscope
~TP-182
(Pre-AMP. unit) and the ground.
(Envelope)
Oscilloscope
~TP-183
(Pre-AMP. unit) and the ground.
(Switching
Pulse)
Oscilloscope
~ Video monitor out terminal and the ground.
Adjustment:
(1) Load the alignment tape (VHJ-0009).
(2) Referring
to the "Guide
Roller Adjustment"
section of the this
Service Manual, set tracking to the center position.
(3) Rotate
the stopper
bracket
fixing
screw
1800
counterclockwise.
(4) Set the
PLAY
mode
and
monitor
the
video
head
output
envelope waveform.
(5) Adjust the stopper
bracket
position
so that amplitude
of the
envelope
waveform
becomes
maximum
at the tracking
center.
Confirm that the envelope
waveform
amplitude
changes
by the
same amount when shifting the tracking center by pressing the
tracking plus(+) and the tracking minus ( – ) buttons.
(6) Tighten the stopper bracket fixing screw.
(7) Model for LP mode tape speed capability:
Playback the alignment tape (VHJ-0052)
and set the tracking to
the center using a tracking control button.
Then confirm that the playback picture on the screen is normal.
If not, make readjustment
by referring to items (1) through
(7).
To readjust, playback VHJ-0009
and finely adjust the position of
the stopper bracket within the range in which the amplitude of
the envelope waveform can be held to a maximum.
(8) Do servo circuit PB PHASE (Switching position) adjustment.
Maximize the
I
Slotted
envelope
Screwdriver
– )
wavwform
after
setting to center
/
with the tracking
button.
Stopper
Bracket
d
Drum
Base
(
Note: For models equipped
with auto tracking,
always set to the manual tracking
mode before
adjustment.
–38–
Advertisement
Table of Contents
