Epson TM-U950 Technical Manual page 132

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