Minolta Di850 Service Manual page 22

2. Protection by the hardware circuit
The output voltages from TH1 and TH2 (fixing
temperature sensor 2), TH3 (fixing tempera-
ture sensor 3), and TH4 (fixing temperature
sensor 4) are compared with the abnormality
judgement reference value in the comparator
circuit. If the output voltage from TH1, TH2,
TH3, or TH4 exceeds the reference value, L2,
L4, and RL1 are turned off in hardware means.
CAUTION:
Periodically check the TH2 and TH4 faces
contacting the roller, and replace TH2
and/or TH4 if any abnormality is detected.
Do not change the gap between the roller
and each sensor TH2 and TH4. When
replacing TH2 or TH4, check the specified
mounting dimensions.
The RL1 function must not be deactivated
under any circumstances.
3. Protection by TS1 (thermostat (upper)) and
TS2 (thermostat (lower))
TS1 is turned off when the temperature of the
fixing roller (upper) exceeds the specified
value, and TS2 is turned off when the tempera-
ture of the heating (upper) roller exceeds the
specified value, thus interrupting the power to
L2 and L4 directly.
CAUTION:
Do not use any other electrical conductor
in place of TS1 and TS2.
S-11
SAFETY INFORMATION