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EPSON LQ-300+ Revision C
Troubleshooting Troubleshooting 46
3.2 Troubleshooting
3.2.1 Initialization Check
Before troubleshooting, check the following basic items.
1. When a printer can perform printing, perform self-test and check if any troubles
occur.
2. When the printer cannot perform any printing, check the setting by “Default
Setting”. (Refer to Chapter 1.)
3. Check if the outside and inside the printer is noticeably dirty or if any parts are
broken. If there is dirt, perform cleaning referring to Chapter 6 “Maintenance”.
4. Make sure each harness is connected properly.
5. Make sure no remarkable friction among printer mechanism gears. Make sure all
gears are linked properly.
6. Make sure there is no dirt nor scratch on rollers inside the printer.
7. Perform EEPROM clear as needed. Inside setting is reset to the factory default
setting. (Refer to Chapter 1.)
3.2.2 Check Performance By Self-Check Function
LQ-300+ has self-check function which supervises the printer condition constantly. If
any problem occurs, it indicates an error by indicator LEDs and in some cases it
notifies errors to the operator by beeping the buzzer. Identify an error cause, referring
to the indication first. If an error is not solved, perform unit repair.
3.2.2.1 Indicator LEDs
The table below shows the indicator LEDs and the printer conditions.
Paper Out Error
This error will be indicated when the printer fails to feed paper or paper is run out.
Solution
Set paper properly and try paper feed again.
Release Lever Error
This error will be indicated when a wrong release lever operation is performed.
For example, if you change the release lever setting when the printer already starts
feeding paper, this error will be shown.
Solution
Reset the release lever.
Fatal Error
This error will be indicated when;
-Carriage error is occurred.
-Input voltage is abnormal.
-Hardware problem is occurred.
Solution
If it is a Carriage error, check if there is no obstacles for Carriage to move.
If it is an input oltage problem, check power supply voltage.
If it is a hardware problem, check the machine and electric circuit.
Table 3-1. Indicator LEDs
Printer Condition Pause Paper Out Front Buzzer
Pause ON - - -
Paper Out Error ON ON - Short beep x3
Release Lever Error ON - - Long beep x5
Paper Eject Warning ON BLINK - -
MICRO Adjust BLINK - - -
Tear Off - -
According to
LED On/Off
combination
-
Font Select - -
According to
LED On/Off
combination
-
Fatal Error BLINK BLINK BLINK -
Table 3-1. Indicator LEDs
Printer Condition Pause Paper Out Front Buzzer
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