24
DX-600/800
DEC 2003
Ver 2.00
UF-580/590/780/790
High Voltage Drive Circuit (Charging, Development and Transfer)
High Voltage is provided through a DC to DC converter, which changes the +24 VDC supply voltage to
-650 VDC, and output approximately 0.64 KVAC (Steady current: 200
µ
A) for the Charging Block. The
Developer Circuit converts the +24 VDC to between -300 VDC for the development bias, and outputs
1,500 VAC (p-p) at a frequency of 1.650 kHz to charge the toner. The Transfer Circuit changes the +24
VDC supply voltage to approxi280 VDC (MAX) (steady current: 3
µ
A/-1500 VDC steady
voltage).
3
GND
Q40
2
1
FG
Discharge Plate
Bias Transfer Roller
Bias Charge Roller
Development Roller
3
Q39
2
1
3
Q3
2
1
HVPS
CPU
pCR0
pCR1
pTR0
CN53
3
4
GND
T
C
D
5
SC PCB
Toner
Cartridge
High Voltage Drive Circuit
3
Q41
2
1
pDRCK
2
nDRCK
nTR0
nCR1
nCRCK
Summary of Contents for Panafax UF-580
Page 170: ...DZZSM00214...
