Epson TM-U950P - B/W Dot-matrix Printer, Technical Manual

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4-18 Troubleshooting Rev. A
Semi-auto loading is not
carried out. Paper guide-assist
operation problem B Check paper guide-
assist for paper deposits
or other contamination.
Check deformation of
auxiliary paper guide
spring. Remove any paper
deposits or other
contamination.
Replace auxiliary paper
guide spring.
Paper roll is not inserted
properly. A Check paper roll
alignment and paper
edge shape. Insert paper roll properly
(see Chapter 3).
Paper roll supplying
problem A Check whether paper
roll corresponds to
specifications. Use paper roll that
corresponds to
specifications.
A Check paper roll path
for obstacles. Remove any obstacles
and repair paper roll
path as required.
Roller-sub paper feed
wear or damage B Check surface of roller-
sub paper feed for wear
and damage. Replace roller-sub
paper feed assembly.
Paper sub hold roller
wear or damage B Check surface and core
of sub paper hold roller
for wear and damage. Replace sub paper hold
roller.
Insufficient lubrication of
friction lever in roller-sub
paper feed assembly B Check lubrication
condition and wear. Lubricate as required or
replace roller-sub paper
feed assembly.
Gear wheel wear or
damage B Check gear wheels for
wear and damage. Replace gear wheels as
required.
J/R paper feed motor
drive signal failure B Check motor drive signal
at connector with an
oscilloscope. Repair motor drive signal
generator circuit.
Wire break or bad
solder point in wiring
between connector and
motor-paper feed-J
and -R B Check connection for
continuity. Replace wiring board
assembly.
B Check solder condition. Resolder as required.
Motor-paper feed-J and
-R failure B Above eleven checks
have been passed. Replace motor-paper
feed -J and -R.
Table 4-3. Printer Mechanism Problems (continued)
Problem Probable Level Checkpoint Action
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