Service Manual

SAFETY AND IMPORTANT WARNING ITEMS
S-12
2
2. Protection by the hardware circuit
The output voltages from TH1, TH2 (fixing tem-
perature sensor/1, /2) are compared with the
abnormality judgment reference value in the
comparator circuit. If the output voltage from
TH1 or TH2 exceeds the reference value, L2
(fixing heater lamp/1), L3 (fixing heater lamp/2)
and RL1 (main relay) are turned OFF in hard-
ware means.
CAUTION:
Periodically check the TH1, TH2 face
contacting the roller, and replace TH2 if
any abnormality is detected.
The RL1 function must not be deactivated
under any circumstances.
3. Protection by TS (thermostat)
When the fixing heat roller exceeds the speci-
fied value, TSs (thermostats) are turned OFF,
thus interrupting the power to L2 (fixing heater
lamp/1), and L3 (fixing heater lamp/2) directly.
CAUTION:
Do not use any other electrical conductor
in place of TS1 and TS2.