Brother HL-1870N - High-Voltage Power Supply

HL-1850/1870N SERVICE MANUAL
3-17
1.6.2 High-voltage power supply
The high-voltage power supply generates and outputs the voltages and currents for the
charging, development and transfer functions.
For the circuit diagram of the high-voltage power supply PCB, see APPENDIX 13. HIGH-
VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM in this manual.
Transfer Roller
Supply
Roller
Photosensitive
Drum
Development
Roller
Corona
Unit
Current
Regulator
Current
Regulator
Voltage
Regulator
Voltage
Regulator
B1
B61 Q63
B81 Q82
Voltage
Regulator
Z51 VR51
VR21
24VI
GND
R1
VR81
Voltage
Regulator
VR31
Cleaning Brush
Fig. 3-17