Ricoh G092 Service Manual page 193

Temperature detection
The thermistor signals, TH1HIGH and TH2HIGH, indicate that the temperature of
the fusing belt has become too high. The TH1HIGH circuit is closed when
0
thermistor 1 [ ] detects high temperature in the middle of the fusing belt. The
TH2HIGH circuit is closed when thermistor 2 [
far side (rear) of the fusing belt. The signal TH1HIGH is used to control the fusing
temperature ( ) Fusing temperature control ). The table lists the pin locations.
(Refer to illustration on pg. 6-29.)
Signal
Name
CN15
TH1HIGH 2
TH2HIGH 3
NOTE: If several sheets of narrow-width paper are continuously fed, the
temperature at the ends of the belt become much higher than the
temperature in the middle. Thermistor 2 (TH2HIGH) prevents the ends of
the belt from overheating.
SM
Pin No.
CN1601 CN15
6 In
5 In
6-31
0 ] detects high temperature at the
In/Out
CN1601
Detects high temperature
Out
in the middle of the belt
Detects high temperature
Out
at the rear end of the belt
CN15: On engine control board
CN1601: On fusing unit
PRINT PROCESS
Remarks
G081/G092