Konica Minolta 7145 Service Manual page 22

SAFETY AND IMPORTANT WARNING ITEMS
2. Protection by the hardware circuit
The output voltages from TH1, TH2 (fixing tem-
perature sensor/1, /2) are compared with the abnor-
mality 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 hardware 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 specified
value, TSs (thermostats) are turned OFF, thus inter-
rupting 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.
3
S-12