Sony UP-21MD Service Manual page 82

Symptom
Cause
Remedy
Does not paper delivery
Too fast timing operates head cleaning
Indicator does not disappear in spite of
no accumulates the delivered paper
5-6
Planetary gears 1, 2 and 3 cannot
change correctly
Replace the mechanism deck
Ribbon cassette has failed
(Paper caught in the bottom of the cassette)
Head block is slipped out of the place
Loss of synchronism in STM
(Beit incorrectly tension)
Replace a ribbon cassette
Reinstall a head block
Readjust the belt tension correctly
STM has failed (No rotating)
STM connector is not connected
Delivery roller has failed
Limit lever is detached from the bearings
Gear is damaged
DC fan has failed
DC fan connector is not connected
Limit lever spring is not hanged
Limit lever is detached from the bearings
Delivery guide incorrectly position
$11 sensor has failed
Replace a STM assembly
Connect the connector ona
STM assembly
Replace a delivery roller assembly
Reinstall the bearings of a limit lever
Replace a gear
Replace a DC fan
Connect a DC fan connector
Re-hang a limit lever spring
Reinstall the bearings of a limit lever
Reinstall a delivery guide
Replace a S11 sensor board assembly
UP-21MD V1