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9-3-4.
Ribbon feed trouble
Phenomenon
~
Symptom
Possible cause
Checking procedure
Remedy
No ribbon feed
Improper mounting of
Check mounting condition of ribbon
Properly mount ribbon
ribbon casSette
cassette.
cassette.
Ribtin ca.SSette
Rotate ribbon cassette takeup knob in
Replace ribbon
defective
arrow direction to check knob operation
cassette.
and ribbon takeup condition.
Foreign matter caught
Manually rotate motor pinion in direction
Remove foreign
in ribbon drive
toward you to check if gear train moves
matter, etc. and
mechanism or broken
smoothly.
replace broken gear.
gear causing action
failure
Trouble in ribbon slip
With ribbon cassette mounted in
Replace ribbon slip
mechanism
position, manually rotate motor pinion in
mechanism.
direction toward you to check if ink
ribbon is taken up properly.
Phenomenon
Jo red printing
9-3-5.
Color change trouble
Symptom
Possible cause
Nocolor change
Maladjustment of
color change timing
Mixed color printing
Mixed color printing
I
I
I
Maladjustment of CC
coil gap
CC coil defective
Connector PCB SA
defective
Trouble in control block
Maladjustment of
color change timing
I
Ribbon mask shape
defective
CC lever operation
failure
Checking procedure
Remedy
Vith printhead positioned at extreme left,
Realign registration
:heck if registration mark (0) on ribbon
mark.
eset cam is aligned with engaging
losition with reset cam drive gear.
Registration
mark
leset
cam
drive aear
Rib&n reset cam
with CC lever pulled in CC coil, check
Readjust gap.
gap between ribbon plate and CC lever.
Check resistance of CC coil.
Replace CC coil.
(Specification: Approx. 30Q)
i
Check for continuity between solder part
Replace connector
on connector PCB SA and connector A.
PCB SA.
Check hardware circuit in control block
Repair control block
and wiring from control block.
and rectify wiring.
With printhead positioned at extreme left,
Readjust registration
check if registration mark (0) on ribbon
mark.
reset cam is aligned with engaging
position with reset cam drive gear.
m
Registration
mark
+
o+
A
.
Reset cam drive
gear Ribbon reset cam
With paper and ribbon loaded in position,
Replace ribbon mask.
carefully move ribbon plate up and down
to check if ribbon does not catch ribbon
mask.
Check if CC lever operates smoothly.
Replace parts or
make corrections.
-21-
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