Sharp DV-NC65H, Service Manual

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38
DV-NC65H/S
DV-NC70H
8-22. REPLACING THE UPPER AND LOWER
DRUM ASSEMBLY
• Replacement (Perform in the numerical order)
1
Remove the motor as stated in 8-21 Replacement of
Drum D.D. motor.
2
Remove the drum earth brush ass’y
2
.
3
Remove the upper and lower drum assembly from main
chassis
1
.
4
Remove the drum FFC holder
3
.
[Cares when replacing the drum]
1. Be careful so that the drum earth brush is not lost.
2. Do not touch directly the drum surface.
3. Fit gently the screwdriver to the screws.
4. Since the drum assembly is an extremely precise as-
sembly, it must be handled with utmost care.
5. Make sure that the drum surface is free from dust, dirt
and foreign substances.
6. After replacing the drum be sure to perform the tape
running adjustment.
After that, perform also the electrical adjustment.
• Playback switching point adjustment
• X-position adjustment and check
• Standard and x-3 slow tracking adjustment
7. After replacing the drum clean the drum.
Figure 8-35.
2
1
3
Lower drum bottom side
8-23. ASSEMBLING OF PHASE MATCHING
MECHANISM COMPONENTS
• Assemble the phase matching mechanism compo-
nents in the following order.
1. Assemble the reverse guide lever and pinch drive cam.
2. Mounting the sifter (on the back of the mechanism
chassis).
3. Mounting the master cam (on the back of the mecha-
nism chassis).
4. Assemble synchro gear (on the back of the mechanism
chassis).
5. Assemble the loading motor parts.
• Pinch drive cam and REVERSE GUIDE LEVER
assembling method.
(Assemble the following parts in numerical order.)
(1)Pinch drive cam
1
(2)Reverse guide spring
2
(3)Reverse guide lever ass’y
3
(4)Open guide
4
Figure 8-36.
4
2
3
1
B
A
Insert it into the
groove of the shaft
Don't run up
on the spring
1
3
2
Synchro gear
The hole is in
the direction of
Synchro gear shaft.
From Top View