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3103S1 1(N)
2-2. SERVO CIRCUIT ADJUSTMENT
..... CP-1 board and Video pre-amp unit
NOTE (1) :
These adjustments should be carried out upon completion of the transport adjustments.
(2) :
If the tape transport adjustments are carried out after these adjustments, follow the procedures again in SWITCHING
POSITIONS.
—
10.
—
1
2
—
Item
SWITCHING
POSITION
SLOW
TRACKING
for
SP MODE
i,
Input
Alignment
cassette
(VHJ-0009
VHJ&23)
Colour bar
from
Colour bar
generator
Mode
PLAY
(SP mode)
REC
J
PIAY
1
SLOW
(SP mode)
Point
VIDEO
OUTPUT
TP101
RF SW
pulse
TP183
(Video pre-
amp unit)
TP183
RF SW
Pulse
J3042
CTL
Pulse
Location
VR351
VR353
Remark
W25S031
Videosignal
7654321
—
V sync
1.
2.
Press the tracking control (+) (-) buttons
simultaneously
to the center position
(on the display 'T –:–
").
Adjust VR351 so that the phase of the
leading edge of the vertical sync signal
is delayed 6.5 y 0.5 H from the rise of
the RF switching pulse waveform.
W20SOOS
CTLpulse
~
1
~12*1
msec
RF switching
pulse
1. Playback the recorded part, and VCR in
the SLOW (SP) mode by remote control
unit.
2. Press the tracking control (+)(-) buttons
simultaneously
to the center position
(on the display 'T –:–
").
3. Adjust VR353 so that there is a trigger
of the peak level of the positive pulse
reading edge of the CTL pulse and the
time from this point to the leading edge
of the RF switching
pulse is 12 t
1
msec.
4. Confirm that the noise at the "+" and "-"
terminals
for tracking
adjustment
is
same at the upper and lower edges of
the screen. If not, readjust VR353.
Shieldcase
F
o
m
0[
@-@}_!
r
TP183
TP182
CN181
SW-P.
ENV.
Fig. 2-2-1 Video pre-amp unit
—4—
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