Troubleshooting Tables - Epson TM U200D - B/W Dot-matrix Printer Technical Manual

Troubleshooting Tables

If a problem that can be verified by visual examination has occurred, use the Troubleshooting
Tables to determine the cause and perform repairs.
The tables contain the following columns:
Problem
This is the symptom that can be verified.
Probable cause
This is a listing of one or several possible causes that should be examined.
Level
Level A The problem can be corrected by persons who are familiar with the printer and
have general knowledge, but special technical skills are not required.
Level B The problem requires thorough knowledge and familiarity with the printer as
well as technical skills and experience.
Checkpoint
These are one or more areas in the printer that should be checked.
Action
These are the steps to correct the problem. If the problem persists after taking these steps,
check the other possible causes listed.
Table 4-1 Troubleshooting table for printer operation failure
Problem Probable cause
The AC adapter may
be bad.
The POWER LED
does not light
The fuse may be
when the
blown.
power is on.
The main PCB may be
bad
The main PCB may be
bad.
The printer does The FEED button may
not print the self be bad.
test.
The printer
mechanism assembly
may be bad.
Rev. B
TM-U200D/U200PD Technical Manual
Level Checkpoint
Check the output voltage of
B the AC adapter. (approx. +40
VDC with unloaded)
Check if the fuse F1 on the
B Main circuit board ass'y is
blown.
Check if fuse (R42) on the Main
B
circuit board ass'y is blown
The cause is none of the
B
above.
Check the self test using
B
another Main circuit board unit.
Check the continuity of the
B
FEED button (SW2).
The cause is none of the
B
above.
Action
Replace the AC adapter.
Replace fuse F1. (See
"Replacing the Fuse" in
Chapter 5.)
Replace the Main circuit
board.
Replace the main PCB.
Replace the main PCB.
Replace SW2.
Replace the mechanism
assembly.
Troubleshooting 4-9