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vc-H91 euigkt
VC-H91SM(BK)
VC-HS82GM(BK)
f) Push the (+) or (-) tracking button to check
that a flat response is obtained on the enve-
lope waveform.
g) Secure the guide roller by tightening the
guide roller setscrew in the unloading mode.
h) Play back the tape drive train alignment tape
to check that the envelope waveform does
not change.
9. Adjustment of A/C head X-position.
a) In the X value adjustment mode (see the Elec-
trical Adjustment), make a short-circuit be-
tween TP5001 (or jumper pin 241) and TP5002
(or jumper pin 242), on the main PWB, with a
22 ohm resistor to center the tracking.
b) Rotate the X-position adjusting nut with an
adjusting box driver, and adjust the A/C head
position for maximum
head switching pulse
low side envelope.
c) Adjust the playback switching point.
d) Check the flatness of the envelope waveform
and sound by playing back a recorded tape.
X-position adjusting nut
1~2mm +5
h
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Main chassis
Figure 4-42.
REPLACEMENT OF THE CAPSTAN D.D.
(DIRECT DRIVE) MOTOR
@ Remove the cassette housing control assembly.
® Removal (Follow the order of indicated num-
bers.)
1. Disconnect from the board-to-board
connector
on the main PWB.
2. Remove the reel belt ©.
3. Remove the screws @.
Capstan D.D. motor
control PWB
CapstanD.D.
motor
Figure 4-43.
26
@ Reassembly
1. Mount the capstan motor on the mechanism
chassis making sure not to allow the capstan
shaft to hit the mechanism chassis, and attach it
with the three screws.
2. Attach the reel belt. Reconnect to the board-to
board connector on the main PWB.
Notes:
1. After installing the capstan D.D. motor, be sure
to rotate the capstan D.D. motor and check the
movement.
2. Check the servo circuit.
REPLACEMENT OF DRUM D.D. MOTOR
1. Put the unit in the cassette eject position.
2. Unplug the power cord.
Removal (Reverse the order in reassembly.)
. Disconnect the FFC cable @.
. Unscrew the stator assembly fixing screws @.
. Take out the stator assembly @.
. Unscrew the rotor assembly fixing screws @.
. Take out the rotor assembly ©.
lotes:
. In removing the stator assembly, part of the
drum earth spring pops out of the pre-load col-
lar.
Be careful not to lose it.
2. Secure the rotor assembly so that the installation
positioning holes in the rotor assembly and up-
per drum assembly match.
(Match the upper drum's notch with the rotor's
hole.)
3. Be careful not to damage the upper drum or the
video head.
4. Be sure that the hall device and the stator assem-
bly are not damaged by the rotor assembly or
other parts.
5. After installation, adjust the playback switching
point.
-2FUuURWN=e
Figure 4-44.
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