Charger Leak Detection:
The machine detects a charger leak error when the FDU CN21-8 stays low
for 3 seconds or more (6 seconds or more at power on) either while in
standby mode or while the corona wire is being charged. When this occurs,
the machine warns the customer by lighting the Call Service indicator (error
code 9-17).
Charge Control
In this machine, a higher corona wire current is used to counter black bands
on copies. The charge on the drum exceeds the zener diode voltage as a re-
sult of this higher current.
Power
Pack
Driver
EXIO
CPU
1-43
21-1
Power
Pack
21-3
21-8
-715V
24VM
Leak Signal
Charge
Fusing Unit Cover
Interlock Switch
ON/OFF
IC8
IC4
FCE
FDU
H521D657.wmf
May 22nd, 1995
DETAILED SECTION DESCRIPTIONS
PRINTING
2-25