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11-6. Servo circuit adjustment
NTSC
switching
position
adjustment.
Connection:
Oscilloscope
(Channel 1) ~ Video Output Terminal and the
ground.
Oscilloscope
(Channel 2)~TP-183
(Pre-A!vlP. unit) and the
ground.
Adjustment:
(1) Load the alignment
tape
(VHJ-0006)
and set the PLAY(SP)
mode.
(2) Set the tracking
control to the center position by pressing the
Tracking (Programme
UP/DOWN
– PA/P
7 )buttons.
(3) Set the Colour System to the NTSC system.
(4) Adjust VR9200 on the main unit so that the width 'T' becomes
6.5H * 0.5H
W PAL switching position adjustment.
Connection:
Oscilloscope
(Channel 1) ~ Video Output Terminal and the
ground.
Oscilloscope
(Channel 2)~TP-183
(Pre-AMP. unit) and the
ground.
Adjustment:
(1) Load the alignment
tape (VHJ-0009)
and set the PLAY(SP)
mode.
(2) Set the tracking
control to the center position by pressing the
Tracking
(Programme
UP/DOWN
– PA/P
7
)buttons.
(3) Set the Colour System to the PAL system.
(4) Adjust VR9201 on the main unit so that the width 'T
becomes
6.5H f 0.5H.
w
11-7.
Audio circuit adjustment
Bias level adjustment-A
Connection:
AC Voltmeter4
TP9001 and TP9002(ground)
on the main
unit.
oscilloscope
~ TP9001 and TP9002(ground).
Colour bar generator ~ Video Input Terminal
Adjustment:
(1) Insert the dummy plug into the Audio Input terminal.
(2) Select the external AV mode by pressing the TV/AV selector.
.
(3) Insert a video cassette
tape(Blank),
and set to the recording
mode(SP).
(4) After confirming
on oscilloscope
that a 70KHz
sine wave
is
being
output,
adjust
VR9001 (Bias
Level)
so that
the
AC
voltmeter's
reading is 21 mVrms.
.
T=6.5H f 0.5H
4
'cH']
w
+
l~5H
Front edge of vertical
>
sync. signal
(CH2) ~k
d
\Rise
RF. Swit{hing
Pulse
(CH1)
T=6.5H A 0.5H
E
Front edge of vertical ~
sync. signal
JR
Rise
(CH2)
RF. Switching Pulse
BIAS LEVEL
ADJ. ,
+'
CN301
J
VR9001
~~o~l
TP9002
w
usu
VR9202
VR9201
m
u
–39–
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