Fusing Lamp Control Circuit; Overview - Ricoh A219 Service Manual

IMAGE FUSING

11.4 FUSING LAMP CONTROL CIRCUIT

11.4.1 Overview

CN113-2
CN113-1
5 V
CN207-7
CN101-3
24 V
Trigger Pulse
24 V
0 V
CN101-4 CN207-6
Main Board
T202
AC Power Source
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.)
A219
CÓPIA NÃO CONTROLADA
P C 2
L4
F U 1
T201
AC Drive/DC Power
Supply Board
2-54
CÓPIA NÃO CONTROLADA
Fusing
Thermistor
T208
Fusing Lamp
C 2 0 T207
T205
R Y 1
T206
Interlock
Switch
T204
T203
230 V machines only
Main Switch
A219D537.wmf
SM