1.3.14 Power Supply - Brother HL-5130 Service Manual

CHAPTER 3 THEORY OF OPERATION

1.3.14 Power Supply

+5V is generated by the 3-pin regulator from astable 7V (8V) supplied from the LVPS. +5V is
used for the IEEE1284 interface, the LD PCB and the engine PCB. In addition, +1.9V is
generated by the 3-pin regulator from 3.3V supplied from the LVPS. +1.9V is used for the
CPU within the ASIC and the logic circuit.
<HL-5130/5140/5150D>
<HL-5170DN>
C101
C100
6.3V 6V
Q2
C220
C104
VCC
2
GND OUT
1
3
NJU7223DL1-19
VDD7
D2
RB751V-40
Q3 NJM2391DL1-05
VCC
C114
C122
GND
C22
16V C104
FG1
C138
C137
6.3V 6V
Q5
C220
C104
VCC
GND OUT
3
NJU7223DL1-19
VDD7
D2
RB751V-40
Q6 NJM2391DL1-19
VCC
C157
C158
GND
C22
16V
C104
FG1
VDD3
D1
RB751V-40
VDD1.8
C93
C89
16V
C10
C104
0V
VDD5
OUT
C103
C116
C10
C104
16V
0V
Fig. 3-27
VDD3
D1
RB751V-40
2
VDD1.8
1
C128
C125
16V
C10
C104
0V
VDD5
OUT
C140
C151
C10
C104
16V
0V
Fig. 3-28
3-16
LVPS
CN7
2
+7V
VDD7
3
0V 0V
C220
C115
6.3V 6V
1
VDD3 +3V
B3B-EH
LVPS
CN8
2
+7V
VDD7
3
0V 0V
C220
C141
6.3V 6V
1
VDD3 +3V
B3B-EH