Specifications

7.4 PRE-TRANSFER LAMP AND TRANSFER/SEPARATION
CORONA CIRCUIT
When the Start key is pressed, the main board outputs Low signals to turn on
the pre-transfer lamp (PTL) and the TC/SC power pack for the transfer and
separation coronas.
The pre-transfer lamp is composed of 50 LEDs supplied by +24 volts.
The TC/SC power pack has a dc to dc converter and a dc to ac inverter. The
dc to dc converter changes +24 volts to -4.8 kilovolts for the transfer corona.
The inverter changes +24 volts to the 5.0 kilovolts ac (500 Hz) for the
separation corona.
The TC2 trigger is only used for the second side copies in duplex copy mode.
This shifts the corona current to increase transfer efficiency.
The separation corona circuit in the TC/SC power pack has a current leak
detection circuit for safety. When this circuit detects that more than 2
milliampere is supplied to the separation corona, the separation corona turns
off immediately. When the main switch is turned off and on, or the front cover
or the exit cover is opened and closed, this condition is cleared.
CN121-2
CN121-1
VA [24]
TC2 Trig [ 24]
TC1 Trig [ 24]
SC Trig [ 24]
GND [0]
CN126-5
CN126-4
CN126-3
CN126-2
CN126-1
CN1-1
CN1-2
CN1-3
CN1-4
CN1-5
[24] VA
[ 24] PTL
PTL (L5)
Main Board
(PCB1)
TC/SC
Power Pack
(P2)
Transfer Corona
Separation Corona
1 December 1990
2-50