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31 December 1992
5.5 T/S CORONA CIRCUIT
T
-5.0 kV
S
AC 4.0 kV
DC -200 V
The T/S power pack is powered by +24 volts (Va) from the dc power supply.
The dc/dc converters and dc/ac inverter change the +24 volts to the high
voltages used by the transfer and separation coronas.
The main board turns on the transfer corona by dropping CN107-B12 (T.Trig)
from 24 volts to 0 volt. This turns on the dc/dc converter, which applies a high
voltage of approximately –5.0 kV to the transfer corona wire. The main board
turns on the separation corona by dropping CN107-B13 (S.Trig) to 0 volt. The
dc/dc converter and dc/ac inverter circuits then apply approximately ac 4.0
kV and –200 V to the separation corona wires.
Normally, T.Sel is not used. However, if the user presses the Auto Image
Density key for longer than 3 seconds, the CPU uses both T.Trig and T.Sel to
turn on the transfer corona. This increases the transfer corona current from
µ
120
A (the normal value) to 250
useful under high humidity conditions (When the higher transfer corona
current is selected, the manual ID display function inverts.)
Transfer/Separation
Power pack
DC/DC
Converter
DC/DC
Converter
DC/AC
Inverter
CN1-2
A. GND
µ
IMAGE TRANSFER AND PAPER SEPARATION
+24 (Va)
CN1-1
CN1
-3
-4
-5
-6
A. The higher transfer current may be
2-31
Main Board
CN107
-B12
24
T. Trig
-A13
5
T. Sel
-B13
24
S. Trig
-B11
5
S. Sel
(Not Used)
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