Drive) Motor - Sharp Vc-M23Sm Servicehandbuch

g) Secure the guide roller by tightening the guide roller set-
screw 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 Electrical Adjust-
ment), make a short-circuit between TP5005 and TP5006,
both located at the Jeft on your side on the main PWB, to
center the tracking.
b) Move the A/C head arm with an adjusting gear driver, and
adjust the A/C head position for maximum head switching
pulse hi side envelope.
Finally tighten the screws @ and @. (Firsttighten the screw
@, and next the screw @.) (Figure 4-36M@)
(Reference: Final tightening torque: 0.6 N.m as prefer-
able.)
c) Adjust the playback switching point.
d) Check the flatness of the envelope waveform and sound by
playing back a recorded tape.
Figure 4-36,
REPLACEMENT OF THE CAPSTAN D.D.
nee DRIVE) MOTOR
Remove the cassette housing control assembly.
¢« Removal (Follow the order of indicated numbers.)
1. Disconnect from the board-to-board connector on the main
PWB.
2. Remove the drive belt @.
3. Remove the screws @.
Capstan D.D. motor
contro] PWB
Capstan D.D.
motor
Figure 4-37.
* 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 connec-
tor on the main PWB.
Notes:
1. After installing the capstan D.D. motor, be sure to rotate the
capstan D.D. motor and chack the movement.
2. Check the servo circuit.
REPLACEMENT OF DRUM D.D. MOTOR
1. Putthe unit in the cassette eject position.
2. Unplug the power cord.
Removal (Reverse the order in reassembly.)
. Disconnect the FFC cable @.
. Unscrew the D.D. stator assembly fixing screws @.
. Take out the D.D. stator assembly @.
. Unscrew the D.D. rotor assembly fixing screws @.
. Take out the D.D. rotor assembly ©.
ohon- *
Notes:
1. In removing the D.D. stator assembly, part of the drum earth
spring pops out of the pre-load collar.
Be careful not to lose it.
2. Secure the D.D. rotor assembly so that the installation posi-
tioning holes in the D.D. rotor peeemely and upper 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 D.D. stator assembly are
not damaged by the D.D. rotor assembly or other parts.
5. After installation, adjust the playback switching point.
Figure 4-38,
23.
S i l a a a S