c. Audio azimuth adjustment
I,
Playback the alignment tape
(ST-N1
1
2.
Connect the channel-l scope probe to TP804.
3. Adjust screw
(B)
vertically to
achieve
maxrmum
audro
level. (See Fig.
4)
d. A/C head position (X-Point) adjustment
1.
2.
3.
4.
5.
6
7
Playback the alignment tape
(
ST-Nl).
Connect the
CH-1
scope probe to
TP202.
Connect the CH-2 scope probe to
TP201
and
trigger head switchrng pulse.
Set the tracking preset to “6 5 ms”
using
the tracking
button
A/V
of remote control. (Refer to
Fig.
7 and
8)
Connect the CH-1 scope probe to TP302 and the CH-2
scope probe to
TP202
trrgger on CH-1.
Turn the screw
(E)
counterclockwrse (See
Frg.
4).
Insert the adjusting driver
(+)
Into
X-positron
adjustrng
gear Adjust the driver
in
erther
drrectron
for maxrmum
envelope waveform.
NOTE : Since the adjusting gear unit may be damaged,
do not adjust by force when adjusting the X-point using
the
adjusting driver (+). After turn the X-point adjusting
screw(D) counterclockwise a little, preform the adjustment
After adiustiment is completed, tighten the screw.
CH2
PROBE
H’D
SIW
PULSE
TP202
CHI PROBE
CTL PULSE
TPZOI
Frg.
7 Tracking Preset Adjustment
I
REMOTE
BUTTONS
I
CONTROL PULSE MOVEMENT
I
A
Tracklng
.d
PUSH
2. Linearity adjustment
(S,%guide
rollers
adjustment)
Test
Pornt
:
TP302
(Envelope)
TP202
(H’D
SW Pulse
-Trigger)
Test Taoe
:
(Mono
Scooe
;
7KHz)
Fig.
9 Location of Test Point
(Main
PCB)
1 Playback the alignment tape (Mono
Sccope
;
SP)
2. Observe the video envelope signal on an oscilloscope
triggered by the head
swrtchrng
pulse.
3. Make sure the
video
envelope waveform
(In
Its
mrnl-
mum or maxrmum output) meets the
specrfrcatron
shown
In
Frg.
10. If
It
does not, adjust as follows
;
NOTE
:
a=Maximum output of the video RF envelope.
b=Minimum output of the video RF envelope at the
entrance side.
c=Minimum output of the video RF envelope at the
center point.
d=Minimum output of the video RF envelope at the exit
side.
b,dla
2
0.70
c/a
2
0.85
Fig.
10 Envelope Waveform Adjustment
Fig. 8 Control Pulse Adjustment
3-5
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