Epson TM-U220 Series Service Manual page 29

Confidential
When initializing operation only is executed
Table 3-5 Only the initializing operation occurs
Probable part/probable cause Checkpoints
DIP switch setting
Main circuit board unit (210)
The printer does not print
The print head operates, but paper is not fed..
Table 3-6 The printer does not print
Probable part/probable cause
Roll paper is inserted
incorrectly
Paper jam
Gear does not rotate
Paper hold spring (1014)
Paper hold roller (1015)
Paper guide roller (1045)
Rev.A
For the serial I/F, check the reset function
setting for pins # 6 and # 25. If the I/F
cable is connected and the reset
function is available, the I/F may always
be resetting.
Check the operation of SE2. Make sure
pressing the FEED button feeds paper.
Make sure the continuity changes when
you operate the switch.
Checkpoints
Check the roll paper. Make sure it meets
specifications. Make sure it is loaded
correctly.
Check for a paper path. Make sure
there is no paper jam.
Check the gear operation. Make sure
the following gears rotate:
Paper feed gear (1063)
Paper feed middle gear B (510)
Paper feed middle gear (509)
Paper feed reduction gear 1 (1093)
Make sure the paper feed motor sub
assembly (1046) shaft rotates with
rotation of paper feed reduction gear 2
(1058).
Check the mounting state. Make sure it
is mounted correctly. (See page 4-17.)
Check operation. Make sure it rotates
smoothly.
Check the operation. Make sure the
roller rotates smoothly.
Check for damage. You should see no
damage, such as wear.
TM-U220 (TypeB/TypeD) Service Manual
Action to correct the problem
Disable the reset function with the DIP
switch setting. Completed if
operation is normal.
Replace the main circuit board unit
(201). Completed if operation is
normal.
Action to correct the problem
Load roll paper that meets
specifications. Completed if
operation is normal.
Open the roll paper cover assembly
and remove the paper jam.
Completed if operation is normal.
Replace the defective gear.
Completed if operation is normal.
Insert the paper hold spring (1014)
correctly. Completed if operation is
normal.
Replace the paper hold roller (1015).
Completed if operation is normal.
Clean, so that the paper guide roller
(1045) rotates correctly. Completed if
operation is normal.
Replace the mechanism assembly
(120). Completed if operation is
normal.
Troubleshooting 3-7