Ricoh SP 310DN, Service Manual, Page: 147 / 184

Service Call
SM 6-9 M154/M155/M174/M175/A0A7/M287/M0BB
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
Defective fusing relay

Defective fusing relay circuit

Open +24V fuse on the PSU

Unstable power supply
1. Check the power supply source
2. Replace the +24V fuse on the PSU
3. Replace the PSU
1. Turn the machine main power off/on
560
Fuser reload error due to low voltage
In a 100V power supply environment:
1. The fusing temperature increased 6 degrees C or less for 5 times
consecutively within 1.5 seconds.
2. The fusing temperature did not reach 45 degrees C within 11 seconds after the
fusing lamp turned ON.
3. The fusing temperature did not reach the reload temperature within 35 seconds
in a normal/high temperature operational environment, or 55 seconds in a low
temperature operational environment.
4. The fusing temperature was 100 degrees C or more below the target
temperature for 5.2 seconds during the waiting and printing statuses.
In a 200V power supply environment:
1. The fusing temperature increased 9 degrees C or less for 5 times
consecutively within 1.5 seconds.
2. The fusing temperature did not reach 45 degrees C within 14 seconds after the
fusing lamp turned ON.
3. The fusing temperature did not reach the reload temperature within 45 seconds
in a normal/high temperature operational environment, or 65 seconds in a low
temperature operational environment.
4. The fusing temperature was 100 degrees C or more below the target
temperature for 5.2 seconds during the waiting and printing statuses.

Disconnected or defective thermistor

Incorrect input power detected at the main power socket

Heater defective or thermostat circuit disconnected
1. Turn the machine main power off/on.
2. Replace the interface harness of the fuser unit.
3. Replace the fuser unit.