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VC-H91GM
VC-H91SM
VC-H9S2GM
ADJUSTMENT OF TAPE DRIVE TRAIN
1.
2.
Hexagon wrench
Remove the cassette housing control assembly.
Make a short-circuit between TP5001 (or jumper
pin 241) and TP5002 (or jumper pin 242) , both
located at the left on your side on the main PWB,
with a 22 ohm resistor. Now turn on the power.
. Check and adjust the position of the tension
pole. (See page 19.)
. Check and adjust the video search rewind back
tension. (See page 18.)
. Set the tilt angle of the A/C head. (See page 22.)
. Rough adjustment of tape drive train.
a) Connect the oscilloscope to the test point for
PB CHROMA envelope output (TP2201).
Set
the synchronism of the oscilloscope to EXT.
The PB CHROMA signal is to be triggered by
the head switching pulse (TP2202).
b) Loosen the setscrew at the lower part of the
guide roller, and adjust it with an adjusting
screw driver (JIGDRIVERH-4) so that the guide
roller turns smoothly.
(Do not overloosen the
setscrew, which causes insecurity of the guide
roller.) (See Figure 4-33.)
c) Set the alignment tape (monoscope pattern)
on the reel disk, and place the unit in the play-
back mode.
(Place a 500 g weight on the cassette tape to
prevent floating of the cassette tape.)
Guide roller
Cassette tape
Weight of 500g
Figure 4-33.
Figure 4-34.
d) In the X value adjustment mode (see the Elec-
trical Adjustment),
change the envelope
waveform from MAX to MIN, and MIN to MAX
by pushing the (+) or (-) tracking button, and
check a flat response is obtained on the wave-
form.
e) If a flat response cannot be obtained, roughly
adjust the guide rollers on the supply side and
take-up side using an adjusting screw driver
until a flat response can be obtained.
f) Turn the A/C head tilt adjusting screw with a
screwdriver to prevent the tape from wrin-
kling at the upper and lower flanges of the
fixed guide.
1) Wrinkles at the upper flange : Turn the
above adjusting screw clockwise, as shown
in Figure 4-35 (a).
24
2) Wrinkles at the lower flange : Turn the
above adjusting screw counterclockwise, as
shown in Figure 4-35 (b).
1 Ik
Wrinkles at upper flange
Clockwise
(a)
te
i
Wrinkles at lower flange
Counterclockwise
(b)
Figure 4-35.
Notes:
1. Place the tracking control in the center position,
and adjust the X-position adjusting nut so that
the PB CHROMA envelop becomes maximum for
easier rough adjustment of the tape drive train.
. In the rough adjustment, pay particular atten-
tion to the outlet side.
db
Loosen the setscrew
eey
X-position
{
adjustingnut
Figure 4-36.
Figure 4-37.
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