Epson TM-U950 Technical Manual page 129

CONFIDENTIAL
Table 4-3. Printer Mechanism Problems (continued)
Problem
Paper roll feed pitch is
irregular.
Slip paper is not fed
properly to print position.
4-16 Troubleshooting
Probable Level
Paper roll supplying A
problem
A
Paper hold roller B
lubrication is insufficient.
Roller-paper feed wear B
Gear wheel wear B
Paper hold roller wear B
Slip paper problem A
Slip paper was A
improperly inserted.
Obstacle in paper path A
inside printer
J/S changeover solenoid B
or sub slip paper feed
solenoid drive signal
failure
J/S changeover solenoid B
or solenoid sub slip
paper feed failure
Wear or damage on A
lever-J/S changeover,
J/S changeover lever
spring, J/S changeover
gear, paper feed
deceleration gear, gear
and roller of roller-sub slip
paper feed assembly,
pulley-carriage
transmission, belt-slip
paper feed
Checkpoint Action
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 whether paper Lubricate as required.
hold roller turns
smoothly.
Check surface of roller- Replace roller-paper
paper feed for wear and feed assembly.
damage.
Check gear wheels for Replace gear wheels as
wear and damage. required.
Check surface and core Replace paper hold
of paper hold roller for roller assembly.
wear.
Check whether slip Use slip paper that
paper corresponds to corresponds to
specifications. specifications.
Check whether slip Insert slip paper aligning
paper is properly aligned with guide portion.
with guide portion of
paper guide-slip-lower.
Check paper path in Remove any obstacles.
printer for obstacles.
Check drive signal. Repair drive signal
circuit.
Check solenoid coil Replace J/S
resistance (nominal changeover solenoid or
value for 25° C: J/S solenoid-sub slip paper
changeover solenoid feed.
45 Ω ± 10%; solenoid-sub
slip paper feed 19 Ω ±
10%).
Check parts for wear Replace parts as
and damage. required.
Rev. A