Gestetner G056 Service Manual page 63

Code No.
542 A Fusing temperature warm-up error
The fusing temperature does not
reach more than 80 °C 17.5 seconds
after the main switch is turned on.
543 A Fusing overheat error
A fusing temperature of over 245 °C
is detected for 1 second by the fusing
thermistor.
A fusing temperature of over 235 °C
is detected for 1 second after the
fusing lamp has been turned off.
545 A Fusing lamp stays on
The fusing lamp stays on more than
12 seconds after the main motor has
been turned off.
546 A Unstable fusing temperature
During standby, within 500 ms, the
fusing temperature goes below 60 °C
twice or over 60 °C three times.
Within 1 minute, a 60 °C increase or
decrease in fusing temperature is
detected during five different one-
second intervals.
547 B Zero cross signal malfunction
Zero cross signals are not detected
within 5 seconds.
610 B Communication error - duplex unit
The engine board cannot
communicate with the duplex unit.
650 B Communication error - GAVD
• The engine board detects an
unknown device on the I
bus (internal bus on the engine
control board).
• The engine board detects an I
I/F bus error.
651 B Communication error - FCI
• The engine board detects an
unknown device on the I
bus (internal bus on the engine
control board).
• The engine board detects an I
I/F bus error.
726 B Shift tray motor error
Tray shift did not finish within a
certain time after the shift motor
turned on.
SM
Symptom
2
C I/F
2
C
2
C I/F
2
C
4-3
SERVICE CALL CONDITIONS
Possible Cause
• Thermistor defective
• Fusing lamp open
• Fusing thermostat open
• Power supply board defective
• Poor connection of the fusing unit
• Fusing thermistor defective
• Power supply board defective
• Fusing thermistor defective
• Power supply board defective
• Poor connection of the fusing unit
• Fusing thermistor defective
• Power supply board defective
• Poor connection of the fusing unit
• Power supply board defective
• Poor mains power supply condition
• Poor connection between engine
board and duplex unit
• Engine board defective
• Duplex control board defective
• Engine board defective
• Engine board defective
• Shift motor defective
• Shift tray: Left shift sensor or right
shift sensor defective
G056/G058