Epson LQ-2550 Technical Manual page 219

Symptom
Printer does not operate at
all with power switch on.
Platen gap adjustment
mechanism and carriage
mechanism are not
initialized.
Abnormal paper release
mechanism operation
Incorrect printing with
mal carriage operation
using
a) When a black
ribbon:
(In the self test or nor-
mal printing mode)
b) When using a color
ribbon:
(In the self test mode)
Abnormal paper feed
Abnormal control panel
operation
Incorrect printing in
ON LINE mode
The flow charts on the subsequent pages use the following symbols.
Table 5-4. Svm~toms and Reference Pages
POWER LED on the control panel is not lit.
.
HF motor does not rotate.
if the printer cover is not shut correctly, the LCD displays
"CASE OPEN."
LCD displays "ERROR n"."
*1: n = O, 2 or 10
The paper feed system is not switched correctly by the
PAPER SELECT switch.
nor-
. Vertical lines (ruled lines) are misaligned.
. A specific dot is missing.
-—- ——————— ——----— ——————— -—- —. ——————— —---
Printing positions are misaligned during color printing
(mixed color; violet, orange, and green).
. Printing colors are not switched correctly.
The paper feeding method and the paper being used do
not match.
. Line feeding is not uniform during printing.
. LD solenoid (paper holding roller shaft) does not open and
close.
Printer does not respond to switches.
LEDs light abnormally.
. No message is displayed on the LCD.
Printer operates abnormally when it is connected to a
host computer.
Start
Processing
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item
Decision
Problem Indicators
5-7
REV.-A
Reference Page
5-8
5-9
5-10
5-11
5-12
5-13
5-14
5-15
Branching
End
Returning to the Start of
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