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b.
Protection against abnormality
Thermostats are used to prevent the tempera-
ture of the fixing rollers from rising abnormally.
TS1 (thermostat 1 (upper)) is used for the fixing
upper roller and TS2 (thermostat 2 (lower)) is
used for the fixing heat roller respectively. Non-
contact type thermostats are used, so they do
not touch each rollers.
The operating temperatures of the above ther-
mostats are as follows:
TS1: Opens at about 180°C
TS2: Opens at about 181°C
2. Signals
a.
PRCB input signals
(1) TH1 ANG1, 2 (TH1 to PRCB)
Detection of fixing upper roller.
This signal is used to control the temperature of
the fixing upper roller and to detect abnormality.
(2) TH2 ANG1, 2 (TH2 to PRCB)
Detection of fixing upper roller temperature.
This signal is used to detect the abnormal tem-
perature of the upper roller and to detect a low
temperature alarm 180°C (356°F).
(3) TH3 ANG1, 2 (TH3 to PRCB)
Detection of fixing heat roller temperature.
This signal is used to control the temperature of
the fixing lower roller and to detect abnormality.
(4) TH4 ANG1, 2 (TH4 to PRCB)
Detection of fixing heat roller temperature.
This signal is used to detect the abnormal tem-
perature of the fixing lower roller and to detect
abnormality.
b.
PRCB Output signals
(1) L2 CONT (PRCB to ACDB)
L2 drive control signal.
[L]: L2 ON
[H]: L2 OFF
(2) L3 CONT (PRCB to ACDB)
L3 drive control signal.
[L]: L3 ON
[H]: L3 OFF
(3) L2 & L3 CONT (PRCB to ACDB)
L2 & L3 drive control signal.
[L]: L2 & L3 ON
[H]: L2 & L3 OFF
(4) L4 CONT (PRCB to ACDB)
L4 drive control signal.
[L]: L4 ON
[H]: L4 OFF
c.
ACDB output signals
(1) RL1 CONT (ACDB to RL1)
RL1 drive control signal.
[L]: RL1 ON
[H]: RL1 OFF
(2) L2 DRIVE (ACDB to L2)
L2 drive control signal.
[L]: L2 ON
[H]: L2 OFF
(3) L3 DRIVE (ACDB to L3)
L3 drive control signal.
[L]: L3 ON
[H]: L3 OFF
(4) L4 DRIVE (ACDB to L4)
L4 drive control signal.
[L]: RL4 ON
[H]: RL4 OFF
(5) L2 TRIG (ACDB to TRC1)
TRC1 trigger signal.
(6) L3 TRIG (ACDB to TRC2)
TRC2 trigger signal.
2-O-7
FIXING UNIT
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