Epson TM-U950 Technical Manual page 131

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