Brother 1660E Service Manual page 47

P4
/HVT3 8
/HVT2 7
HVTFB 10
HVT4 9
/HVT1 6
TONER1 11
TONER2 13
0V 12
24VRET 14
+5V 15
+24V 16
TRANSFER HIGH-VOLTAGE
Pulse
Generator
Attenuator
Pulse
Generator
TONER SENSE
Figure 3.11 High-Voltage Power Supply Block Diagram 2
Current
Buffer
Current
Buffer
Constant Current
Control Unit
(Feedback Circuit)
(ON / OFF Circuit)
Constant Voltage
Control Unit
(HVT4 Control Circuit)
Current
Buffer
Toner Sense
Control Unit
(Toner 1 Circuit)
(Toner 2 Circuit)
III - 15
High-Voltage
Electrode
P5
Toner Sense
Electrode
P3
DBOUT