Ribbon Drive Assembly - Sony UP-55MD Service Manual

1-5-4. Ribbon Drive Assembly

1. Remove the top cover. (Refer to Section 1-3-1.)
2. Remove the front panel assembly.
(Refer to Section 1-3-2.)
3. Remove the MA-142 board. (Refer to Section 1-4-1.)
4. Remove the mechanical main unit assembly.
(Refer to Section 1-5-2.)
5. Remove the four screws, then remove the ribbon drive
assembly.
6. Disconnect the two harnesses from the connectors on
the SU-86 board and SU-87 board.
SU-87 board
Ribbon drive assembly
1-10
Mechanical main
unit assembly
BVTT
2.6 x 5
SU-86 board
BVTT
2.6 x 5
Harnesses
7. Remove the two retaining rings (W2.3) and the
retaining ring (W3.0), then remove the idler gear (R),
worm wheel (R) and limiter (S) assembly.
8. Remove the four screws, then remove the two DC
motor (ribbon) subassemblies.
9. Remove the retaining ring (W2.3), then remove the
ribbon lock and ribbon lock spring.
10. Remove the retaining ring (W2.3), then remove the
supply lock and supply lock spring.
11. Remove the retaining ring (W3.0), then remove the
ribbon gear.
12. Remove the retaining ring (W2.3), then remove the
limiter (T) assembly.
Worm wheel (R)
Idler gear (R)
Ribbon gear
W3
W2.3
W3
W2.3
PS3 x 4
Limiter (S)
assembly
Worm wheel (R)
Ribbon lock
Limiter (T)
assembly
Supply lock
DC motor (ribbon) subassemblies
13. Attach the ribbon drive assembly in the reverse order
of steps 1 to 12.
DC motor (ribbon)
subassemblies
Ribbon lock
Ribbon lock
spring
W2.3
W2.3
Supply
lock
Supply lock
Limiter (T)
spring
assembly
Idler gear (R)
Ribbon gear
Limiter (S) assembly
UP-55MD