11.4 FUSING LAMP CONTROL CIRCUIT
11.4.1 Overview
The main board monitors the fusing temperature through a thermistor. It uses
the zero cross signal generated by the ac drive/dc power supply board to
control the applied power accurately.
Normally, the voltage applied to the lamp is the full duty cycle of the ac
waveform. However, through SP29, fusing power can be set to phase control
mode. (Phase control is used only if the customer has a problem with
electrical noise or interference.)
CN113-1
CN113-2
5 V
CN101-3
24 V
CN101-4
CN207-7
CN207-6
PC2
T205
T206
T204
T207
T208
T203
Interlock
Switch
Main Switch
Fusing Lamp
Fusing
Thermistor
AC Power Source
FU1
AC Drive/DC Power
Supply Board
Main Board
Trigger Pulse
24 V
0 V
T202
T201
RY1
✽
L4
✽
C20
✽
230 V machines only
A219D537.wmf
IMAGE FUSING 20 December 1996
2-54
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