Service manual

Service Call Conditions
M052/M053/M054 6-10 SM
The fusing temperature does not reach the standby temperature within 24
sec. at the center of the hot roller after the main switch turned on.
The condition which the fusing temperature does not increase by 7°C for 2
seconds is detected five times consecutively.
 Fusing thermistor defective or out of position
 Fusing lamp disconnected
 Fusing lamp defective
543 A Fusing overheat error 1 (center)
The fusing thermistor detected a fusing temperature over 235°C for 1 sec.
at the center of the hot roller.
 TRIAC short on PSU (PSU defective)
 BICU board defective
544 A Fusing overheat error 2 (center)
A fusing temperature over 250°C is detected at the center of the hot roller
by the fusing temperature monitor circuit in the BCU board.
 TRIAC short on PSU (PSU defective)
 BICU board defective
 Power supply voltage unstable
545 A
Heating roller fusing lamp consecutive full power 1
When the fusing unit is not running in the ready condition, the heating
roller fusing lamp keeps on full power for 12 seconds.
 Broken heating roller thermostat
 Broken heating roller fusing lamp