Epson EPL-5900, Service Manual

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EPSON EPL-5900/EPL-5900L Revision B
Troubleshooting Overview 86
3.1.6 Detection of 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
•
Immediately after start of the polygon motor (M3), the laser diode is forced to
emit light and the laser power is adjusted.
During laser power adjustment, if the adjustment signal (LD_APC1,
LD_APC2) goes out of the rated value, it is detected as abnormal laser.
ABNORMAL POLYGON MOTOR
This error is detected in any of the following cases:
•
The /SSCAN signal is never detected within 0.8 seconds after the polygon
motor is turned ON.
•
The rotation frequency of polygon motor does not settle within
±
0.5% within
6.0 seconds after the polygon motor is turned ON.
•
After the polygon motor is turned ON and the rotation frequency of polygon
motor has settled within
±
0.5%, the rotation frequency goes beyond
±
3% for
more than 5.5 seconds continuously.
ABNORMAL MAIN MOTOR
This error is detected in any of the following cases:
•
The motor lock signal (/MotorLock) is not detected within 1.0 sec after the
main motor is turned ON.
•
The motor lock signal (/MotorLock) is turned OFF for 0.1 sec continuously.
ABNORMAL FUSING
This error is detected in any of the following cases:
•
If during temperature control the thermistor detects that the temperature
exceeds 220
°
C for 50 msec, it is detected as abnormal fusing high
temperature.
•
The temperature detected by the thermistor within a period from 8 seconds
after to 12 seconds after warming-up is found below the standard value for 50
msec, the thermistor is determined to be in trouble.
(This detection applies only when the temperature detected by the thermistor
is below 80
° C.)
•
If no temperature rise is detected by the thermistor for more than 3 seconds
within a period from 700 msec after turning on of the heater lamp (H1) to the
turning off of the heater lamp (H1), it is detected as abnormal fusing
temperature rise.
•
If the heater lamp (H1) is kept on for more than 30 seconds, it is detected as
abnormal fusing temperature rise.
•
In any mode, if the temperature detected by the thermistor goes below the
setting temperature for 50 msec continuously, it is determined as abnormal
fusing low temperature.
Setting temperature is 140
° C (600dpi) or 110 ° C (1200dpi) in the printing
mode and 70 ° C in the waiting mode.
ABNORMAL COOLING FAN
If the input value for the FAN_LOCK(AN) signal is detected to be below 2.0 V for 2.0
seconds continuously during operation of the cooling fan (M2), the cooling fan is
determined to be faulty.
ABNORMAL CHARGING VOLTAGE
If the HVC_MON(AN) signal is detected to be out of the specified limits after passage
of 0.5 seconds from power on, charging voltage is determined to be abnormal.