Sharp VC-A400U Service Manual page 24

VC-A400U
VC-H800U
REPLACEMENT OF THE CAPSTAN D.D.
(DIRECT DRIVE) MOTOR
• Remove the mechanism from the main PWB (refer to
Page 7 item 1 When removing the mechanism from the
main PWB ).
• Removal (Follow the order of indicated numbers.)
1. Remove the reel belt 1.
2. Remove the three screws 2.
Capstan D.D.
motor
• Reassembly
1. Taking care so that the capstan shaft does not contact
the mechanism chassis, set its position on the mecha-
nism chassis, and then install with the three screws.
2. Install the reel belt.
Notes:
1. After installing the capstan D.D. motor, be sure to rotate
the capstan D.D. motor and check the movement.
2. Set the tape, and check for the tape crease near the
reverse guide in the playback mode. Adjust the A/C
head and azimuth as stated in Page 20 item 2. If crease
is found, adjust as stated in Page 21 "HEIGHT ADJUST-
MENT OF REVERSE GUIDE".
2
Capstan D.D. motor
control PWB
1
Reel belt
Figure 4-37.
REPLACEMENT OF DRUM D.D. MOTOR
1. Set the ejection mode.
2. Withdraw the main power plug from the socket.
• Removal (Perform in numerical order.)
1. Disconnect the FFC cable 1.
2. Unscrew the D.D. stator assembly fixing screws 2.
3. Take out the D.D. stator assembly 3.
4. Unscrew the D.D. rotor assembly fixing screws 4.
5. Take out the D.D. rotor assembly 5.
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. Install, so that the D.D. rotor ass'y and upper drum ass'y
mounting direction check holes align.
(Align the upper drum dent with the rotor hole.)
3. Be careful not to damage the upper drum or the video
head.
4. Protect the hole elements from shock due to contact with
D.D. stator or D.D. rotor ass'y.
5. After installation adjust the playback switching point for
adjustment of servo circuit.
2
4
5
24
D.D. stator ass'y
3
1
FFC
4
D.D. rotor ass'y
Upper drum
Figure 4-38.