Ricoh FT7770 Service Manual page 49

30 April, '89
11. Thermistors
Bias (TH-2)
Drum (TH-1)
Fusing (TH-3)
12. Thermoswitches
Anticondensation
(TS-2)
Cleaning (TS-3)
Optics 220/240 V (TS-1) 66
Optics 115 V (TS-1)
13. Corona Wires
Charge (CW-1)
Pre-transfer (CW-2)
Transfer (CW-3)
Separation (CW-4)
Pre-cleaning (CW-5)
Pre-quenching (CW-6)
17 Monitors the drum temperature for control
of the development bias.
17
Monitors the drum temperature for control
of the drum heater.
94
Monitors the hot roller temperature for
control of the fusing lamps.
13 Controls the the anticondensation heater.
(Closes at 17°C, opens at 25°C).
24 Controls the optics and development cool-
ing fans (Closes at 55°C, opens at 40°C);
Controls the optics and development cool-
ing fans. (Closes at 55°C, opens at 45°C)
99 Controls the optics and development cool-
ing fans. (Closes at 55°C, opens at 45°C)
18 Applies a positive corona to the drum.
63 Applies an ac corona to the drum and deve-
loped image.
23 Applies a positive corona to the back side
of the copy paper.
25
Applies an ac corona to the back side of
the copy after image transfer.
22 Applies an ac corona with a negative bias
to the drum.
21 Applies a positive corona to the drum.
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