Epson TM U200D - B/W Dot-matrix Printer Technical Manual page 88

Table 4-1 Troubleshooting table for printer operation failure (Continued)
Problem Probable cause
An incorrect interface
cable may be used.
For the serial interface
models, the printer DIP
switch settings do not
Data from the
match the host
host is printed
settings.
incorrectly.
The Main circuit board
unit may be bad.
The mechanism
assembly may be
bad.
The PAPER OUT
The near-end
LED does not
detector assembly
correctly
may be bad. (The
indicate the
near-end detector is
status of the
an option.)
paper roll.
The connector is not
inserted correctly.
The Motor, carriage
The printer is not
ass'y may be bad.
initialized.
The Motor, carriage
(Home position
may be bad.
detection error)
The home position
detector ass'y may be
bad.
The operation of the
paper supply may be
incorrect.
The paper path may
be incorrect.
The connector is not
inserted correctly.
Semi-automatic
loading is not
executed. Motor, Paper feed
(Paper is not
may be bad.
fed.)
The Roller, paper
hold ass'y may be
worn.
The gears may be
worn or damaged.
The Paper detection
switch ass'y may be
bad.
4-10 Troubleshooting
Level Checkpoint
Check if the interface cable
A matches the printer
specifications.
Check if the printer DIP switch
A
settings match the host settings.
Check the printer using another
B
Main circuit board unit.
The cause is none of the
B
above.
Check the signal of the near-
B
end detector assembly.
Check if the pin of CR motor
cable is inserted in the
A
connector CN6 of the main
circuit board unit.
Check the continuity of each
B
terminal.
The cause is none of the
B
above.
Using an oscilloscope, check if
the detection signal is output
B when print head unit passes
above the home position
detector ass'y.
Check if the paper roll meets
A
the printer specifications.
Check if the paper supply path
A is blocked by paper particles or
foreign materials.
Make sure that the pin of the PF
motor cable is not inserted in
A
the connector CN6 of the main
circuit board.
Check if the motor rotates
B
during semi-automatic loading.
Check if the Roller, paper hold
B
are worn or damaged.
Check if the Gear, paper feed
B reduction and Gear, paper
feed are worn or damaged.
Using an oscilloscope, check if
B the detection signal is output
when roll paper is inserted.
Action
Use the correct interface
cable.
Change the printer DIP
switch settings or host
settings so that they
match.
Replace the Main circuit
board unit.
Replace the mechanism
assembly.
Replace the near-end
detector assembly.
Reinsert the connector.
Replace the Motor,
carriage asse'y.
Replace the Motor,
carriage ass'y.
Replace the home position
detector ass'y.
Use the correct paper roll.
(See "Paper Specifications"
in Chapter 1.)
Remove any pieces of
paper, paper particles or
foreign materials.
Reinsert the connector.
Replace the Motor, paper
feed.
Replace the Roller, paper
hold ass'y.
Replace any worn or
damaged parts.
Replace the Paper
detection switch ass'y.
Rev.B