1.3.11 Power Supply - Brother HL-2030 Service Manual

CHAPTER 3 THEORY OF OPERATION

1.3.11 Power supply

+5V is supplied from LVPS. +5V is used by IEEE1284 interface.
In addition, +3.3V is generated by the 3-pin regulator from +5V supplied from the LVPS. +1.9V
is used for the CPU within the ASIC and the logic circuit.
24V is used for the motors and solenoids.
<HL-2030/2040>
RELAYOFF
H: RELAY ON
L: RELAY OFF
HEATERON
H:
L:
LM393P
THM
CN8
1
VDD3
2
CENTER_THM
3
EDGE_THM
4
VDD3
C142
C101
<HL-2070N>
RELAYOFF (FX OPTION)
H: RELAY ON
L: RELAY OFF
HEATERON
H: HEATER ON
L: HEATER OFF
U13 8
V+
LM393P
THM
CN9
1
VDD3
2
CENTER_THM
3
EDGE_THM
4
VDD3
(FX OPTION)
RLYOFFN
1-4D
HEATERON
HEATER ON
1-4D
HEATER OFF
TP132
HTLIMITN
1-3D
C88
C104
10%(B)
0V
VDD5
U8 8
V+
C77
C103
V-
4
0V
1SS355
RSTN
1-2A/1-7A/4E
D4
R127
L6 (1608)
18k
1%(F)
VDD3
0
ANALOG
0V
ANALOG
VDD3
C103
R128
C101
C102 18k
C141
1%(F)
C101
C101
0V 0V
0V
RLYOFFN
1-2F
HEATERON
1-2F
TP165
R123
HTLIMITN
1-2F 470k
C151
C104
10%
0V
VDD5
C147
C103
V-
4
0V
1SS355
RSTN
1-2C/2-5D
D3
R103
18k
L7 (1608)
1%(F)
VDD3
0
ANALOG
0V
ANALOG
VDD3
C134
C135
R104
C101
C101
18k
1%(F)
0V 0V
TP138
R97
470k
VDD3
R96
22k
1%(F)
R94
1.5k
U8
TP129
1%(F)
+
3
1
R95 -
2
LM393P
18k
1%(F) VDD3
0V
R81
10k
TP119
TP137
R82
10k
R125
0
0V
TP151
R126
THM1
10k 1-3E
C101
REG_FRONT_SEN
C103
R130
PEDG_SEN
0
0V
TP152
R129
10k
C104
C103
0V
Fig. 3-22
TP164
TP155
VDD3
R121
22k
1%(F)
R119
1.5k
U13
TP159
1%(F)
+
3
1
R117 -
2
LM393P
18k
1%(F) VDD3
0V
R120
10k
TP161
5
6
TP132
R118
10k
R94
0
0V
TP140
R102
THM1
10k 1-6B
C126
REG_FRONT_SEN
C103
R95
PEDG_SEN
0
0V
TP141
R105
10k
C127
C103
0V
Fig. 3-23
3-16
TP162
VDD24
24RET
R135
1k
0V
VDD5
U8
Q3
TP163
C
+ 4.7k
5
7
B TNRLED
-
6
LM393P
E
47k
DTC143ZUA
0V
VDD3
R137
68k
TP64
R56
100
TP65
1-3E
R57 100
1-3E
C46 C45
C102
C102
0V
TP119 TP133
VDD24
TP67 TP239
24RET
R122
TP160 TP56
1k
0V
VDD5
U13
Q3
TP167
C
+ 4.7k
7
B TNRLED
-
LM393P
E
47k
DTC143ZUA
0V
VDD3
R125
68k
TP99
R124
100
TP102
1-4A
R126 100
1-4A
C161 C160
C102
C102
0V
LVPS
CN11
L5
1
RELAYOFFN
C130
C102
0V
7
HEATERONN
C119
C102
0V
TP167 TP166
6
+24V
C123
C104
TP170 TP168
5
24RET
C122
TP164 TP165 C103
9
S0V
C116
C138
10V 12V
C104
C220
8
+5V
(1608)
4
TNRLED
1-3E
C126
C102
0V
R139
68k
3
FRONT_SEN
2
PEDG_SEN
B9B-PH-K-S(LF)
C134
C135
C101
C101
0V
LVPS
CN12
L6
1
RELAYOFFN
C163
C102
0V
7
HEATERONN
C154
C102
0V
6
+24V
C157
C104
(1608)
5
24RET
C158
C103
9
S0V
C31
10V 12V
C220
8
+5V
4
TNRLED
1-2F
C159
C102
0V
R127
68k
3
FRONT_SEN
2
PEDG_SEN
C194
C193
B9B-PH-K-S(LF)
C101
C101
0V
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