Panasonic DF-1100 Service Manual page 229

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 0.72 KVAC (Steady current : 450 µA) for the Charging Block. The Developer
Circuit converts the +24 VDC to between –500 VDC for the development bias, and outputs 1,700 VAC(p–p)
at a frequency of 1.7 kHz to charge the toner. The Transfer Circuit changes the +24 VDC supply voltage to
approximately +600 VDC (steady current: 3.0 µA/–800 VDC steady voltage).
3
PCR0
2
Q509
1
PCR1
IC 51
PDR1
CPU
PTR0
PTR1
GND
3
2
Q510
3
1
2
Q511
3
1
2
Q512
1
2
LPC PCB
High Voltage Drive Circuit
CN52 CN39
2
3
Discharge Plate
4
Bias Transfer Roller
T
Bias Charge Roller
C
5
Development Roller
D
6
3
Q513
1
HVPS
System Description
FG
Toner
Cartridge
6–33