Service manual

EPSON EPL-5800 Revision B
Troubleshooting Troubleshooting 61
3.1.2 Troubleshooting for Abnormal Operations
If the following errors are detected by a built-in diagnostic function, all the drive is turned
OFF and the hardware error is indicated on the control panel.
ABNORMAL LASER
1. Right after the polygon motor starts rotating, the laser diode is forced to emit lights and
the laser power is adjusted.
While the laser power adjusted, if the adjustment signal (DA1, DA2) goes out of rated
value, it is detected as abnormal laser.
ABNORMAL POLYGON MOTOR
This error is detected in the following cases;
1. /SSCAN signal is not detected even once within 0.8 seconds after the polygon motor is
turned ON.
2. The rotation number of polygon motor does not settle within
±
0.5% within 6.0 seconds
after the polygon motor is turned ON.
3. After the polygon motor is turned ON and the rotation number of polygon motor
settled within
±
0.5%, the rotation number goes beyond
±
3% for more than 5.5 seconds
continuously.
ABNORMAL MAIN MOTOR
This error is detected in the following cases;
1. Motor lock signal is not detected within 1.0sec after the main motor is turned ON.
2. Motor lock signal is turned OFF for 0.1 sec continuously.
ABNORMAL FAN MOTOR
This error is detected in the following case;
1. Motor lock signal is detected as “H” for 2.0 sec continuously after the fan motor is
turned ON. (At normal rotation, the motor lock signal indicates “L”)
ABNORMAL FUSING
1. If in any condition the thermistor detects that the temperature exceeds 220
°
C for
50msec, it determines as fusing abnormal high temperature.
2. The temperature detected by the thermistor from 8 to 12 seconds after warming-up and
the temperature detected by the thermistor when warming-up starts are compared, and
if it is detected that the temperature detected by the thermistor is below the standard
value for 50msec, it determines the thermistor is in trouble.
(This detection applies only when the temperature detected by the thermistor is below
80
°
C.
3. If the temperature detected by the thermistor does not reach the setting temperature
within 45 seconds after warming-up starts, it determines as fusing abnormal rising.
4. When controlling the temperature, if the temperature detected by the thermistor goes
below the setting temperature for 50msec continuously, it determines as fusing
abnormal low temperature.
Setting temperature is 140
°
C (600dpi) or 110
°
C (1200dpi) on the printing mode and
70
°
C on the waiting mode.