Sony UP-21MD Service Manual page 81

Symptom
Color print gap occurs in printing side
Density irregular occurs in printing side
Thinning print occurs in printing side
Streak fines occurs in printing side
Irregular sound occurs under printing
Paper jammed
UP-21MD V1
Cause
Grip roller does not meshing to pinch roller
Remedy
Replace the mechanism deck
Back tension spring unsuitability strength
Torque limiter unsuitability strength
Belt incorrectly tension
Loss of synchronism in STM
(Belt incorrectly tension)
Replace the mechanism deck
Replace the mechanism deck
Readjust the belt tension correctly
Reinstall a STM assembly
Head block is slipped out of the place
(Defective of compressibility)
Head block incorrectly position
Reinstall a head block
Replace the cam, joint gear or gear
(Cam, joint gear or gear has failed)
Head has failed
Replace a head
Head block is slipped out of the place
Head block incorrectly position
(Cam, joint gear or gear has failed)
Head incorrectly position
Reinstall a head block
Replace the cam, joint gear or gear
Readjust the head position correctly
Specified paper does not use
Head block is slipped out of the place
(Defective of compressibility)
Head block incorrectly position
(Cam, joint gear or gear has failed)
Head incorrectly position
Head block is slipped out of the place
Ribbon cassette has failed
Back tension spring unsuitability strength
Torque limiter unsuitability strength
Loss of synchronism in STM
(Belt incorrectly tension)
Gear is damaged
Overlapped paper feed
Overiapped paper feed cause
of the paper stuck
Ribbon cassette has failed
(Paper caught in the bottom of the cassette)
Use the specified paper
Reinstall a head block
Replace the cam, joint gear or gear
Replace a head block assembly
Reinstall a head block
Replace a ribbon cassette
Replace the mechanism deck
Replace the mechanism deck
Readjust the belt tension correctly
Replace a gear
Remove the overlapped feed paper
(Do not use the removed paper)
Replace the-mechanism deck
Remove the overlapped feed paper
(Do not use the removed paper)
Dispose the reminded paper thoroughly
Replace a ribbon cassette
Reinstall a head block Head block is slipped out of the place
Loss of synchronism in STM
(Belt incorrectly tension)
STM has failed (No rotating)
STM connector is not connected
Readjust the belt tension correctly
Replace a STM assembly
Connect the connector ona
STM assembly
Harness of the rear side is detached
to the paper carrying path
Improve wiring of the harness