Ricoh M5 Service Manual page 127

— Hardware Overheat Protection —
In case the software overheat protection fails, a
lamp. If the thermoswitch temperature reaches
– Service Call Conditions –
Thermistor Circuit Open:
If the temperature detected through the TH does
10 seconds after the main switch turns on, the CPU stops the machine and displays self-diagnostic
code E5.
Thermistor Circuit Short:
If the temperature detected through the TH reaches 220 degrees Celsius (0.56 kilo-ohm), the TH
The CPU then stops the machine and displays self-diagnostic code E5.
short-circuits.
Fusing Lamp Circuit Open:
If the temperature detected through the TH does not reach 167 degrees Celsius (1 .57 kilo-ohm) with-
in 75 seconds after the main switch is turned on, the CPU stops the machine and displays self-diag-
nostic code E5.
.- .
thermoswitch is installed in series with the fusing
245 degrees Celsius, the thermoswitch opens.
not reach 2 degrees Celsius (300 kilo-ohm) within
3 - 6 9
May, 25, 1985