AMSTRAD CTM644 - Disc Drive Mechanism Details; Disc Drive Mechanical Replacements

Fig. 6.
Sym
1
i
2
3
4
5
6
7
8
9
10
Description
Head Assembly
Stepper Motor
Stepper Motor Rotation Bolt
Spindle Motor
Flywheel
Pulley
Read/Write Protect/Index/LED P.C.B.
Track 00 Sensor Assembly
Spring
Loading Unit
MECHANICAL REPLACEMENTS
5
MECHANISM
3
~
10
This drawing is for information only. During
the warranty period Service Agents must
return the Disc Drive Mechanism complete
with PCB30001 for replacement.
6
I
Head Assembly
i) Remove 2 screws from F. panel and remove F. panel.
ii)
Remove 4 screws from the control PCB.
iii)
Disconnect plug from Stepper Motor.
iv) Disconnect plug from LED P.C.B.
v) Disconnect transistor from Spindle Motor.
vi) Disconnect Index Sensor from front of P.C.B.
vii) Raise P.C.B.
from side opposite LED and remove plug from head.
viii)
Control P.C.B. will now be free - remove.
ix)
Remove 4 screws securing the Loading Unit to the chassis from the Flywheel side and remove
Loading Unit.
x) Remove spring and rod support screws.
xi) Gently slide the head off the rod.
xii)
Replacement is reverse process.
After reassembly check alignment of Azimuth Burst/Track 00 Positioning.
Spindle Motor
i) Remove transistor fitled to Motor.
ii) Unplug CN5 from Control P.C.B.
iii)
Remove Drive Belt.
iv)
Undo 2 screws securing motor.
v) Replacement is reversal of removal.
vi)
Adjust VR201 so Index frequency is 200 ± 2ms (See Fig. 5-1).
Stepper Motor
i) Remove Control P.C.B. as (1).
ii)
Remove 2 securing screws for Stepper Motor Bracket.
iii) Stepper Motor can now be removed.
iv) After replacement index and positioning must be checked and amended as necessary.
37