Rev. A Troubleshooting 4-19
TM-U950/U950P Technical Manual
Ribbon feed
mechanism does not
operate.
Ribbon cassette and
ribbon gear are not
interlinked properly.
B Check whether ribbon
cassette is inserted
properly.
Insert ribbon cassette as
described in Chapter 3.
Lever-ribbon feed planet
assembly failure
B Check spring washer for
wear or deformity.
Replace lever-ribbon
feed planet assembly.
B Check planet gear and
spring washer lever for
wear.
Lubricate as required or
replace lever-ribbon
feed planet assembly.
Ribbon slips in ribbon
cassette.
A Turn ribbon cassette
knob to check ribbon
feed.
Replace ribbon
cassette.
Gear wear, damage, or
contamination
B Check gears for wear,
damage, or foreign
matter.
Replace gears as
required or remove any
foreign matter.
Paper roll is not taken
up, or is taken up loosely.
Paper take-up shaft
wear or damage
B Check paper take-up
shaft for wear and
damage.
Replace paper take-up
shaft.
Paper take-up pulley
wear or damage
B Check paper take-up
pulley for wear and
damage.
Replace paper take-up
pulley.
Gear wheel wear or
damage
B Check gear wheels for
wear and damage.
Replace gear wheels as
required.
Paper take-up belt is
dislodged, worn, or
extended.
A Check seating, wear,
and extension condition
of paper take-up belt.
Position belt properly or
replace belt.
Cutter motor does not
operate when cutting
command is given.
Cutter motor input
signal failure
B Check voltage at cutter
motor terminals (nominal
value: 24 V (±) 10%)
Repair drive signal
circuit.
Cutter motor is
defective.
B Remove cutter motor
and check operation by
connecting a 24 V
power supply.
Replace cutter motor.
Wire break or bad
solder point in wiring
between connector and
cutter motor
B Check connection for
continuity and check
solder condition.
Replace cutter motor or
resolder as required.
Cutter motor turns, but
cutter blade does not
operate.
Gear is damaged or
dislodged.
B Turn cutter motor gear
and deceleration gear A
by hand to check cutter
blade operation.
Replace damaged
gear or mount gear
properly.
Table 4-3. Printer Mechanism Problems (continued)
Problem Probable Level Checkpoint Action
CONFIDENTIAL
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