Overheat Protection (B044/B045/B046) - Gestetner B130 Service Manual

IMAGE FUSING AND PAPER EXIT

6.22.13 OVERHEAT PROTECTION (B044/B045/B046)

Primary protection is provided by the thermistor and CPU, with backup by a
thermoswitch and secondary backup by a thermofuse. (See illustration above.)
Protection 1: If the CPU determines from the thermistor that the hot roller has
stayed above 230°C for more than 1 second, it cuts the power to the
fusing lamp and issues SC543.
Protection 2: The thermoswitch (connected in series with the fusing lamp's
common ground) opens if it reaches 190°C, cutting power to the
lamp. If you restart the machine without correcting the problem, the
machine will issue SC541.
Protection 3: The thermofuse (which is farther from the lamp than the
thermoswitch) opens at 131°C, cutting power to the lamp.
B129 Series/B044 Series
CÓPIA NÃO CONTROLADA
6-64
CÓPIA NÃO CONTROLADA
SM