Brother HL-4040CN, HL-4050CDN, HL-4070CDW Service Manual page 317

Engine PCB Circuit Diagram (3/5)
1 2
Fuser_Fan +24V_FAN
R297
R295 22k
3.3k
TP159 E
(1/2 3025)
Q31 B
4.7k C
TP164 C
fuser_fan_high
1-1D B
Q24
TP156
E 2SB1197K (RANK:R)
47k
A
DTC143ZE
(1608) SGND
+24V_FAN
R304
22k
R308 2SB1197K (RANK:R)
TP157 3.3k
B E
Q34 ZD3 ZD4
4.7k C (1/2W C
TP160
fuser_fan_low 3025)
B Q25
1-1D
BZX85-C5V6
TP153 BZX85-C5V6
E
1.3W(Pitch=15)
47k 1.3W(Pitch=15)
DTC143ZE
SGND
(1608)
Aia_FAN
+24V_FAN
R309
22k
R318
5.6k
TP158
(1/4W,3216) E
Q32 B
4.7k C C
TP163
air_fan
B
1-1D
Q26
TP155
E
2SB1197K (RANK:R)
B 47k
DTC143ZE
SGND
(1608)
+3.3V
R234
R233 4.7k
100
fan_lock_n
1-1D C171
TP154
C102
SGND
PS_FAN
+24V_FAN
R296
22k
TP287
R310
B E
C
Q33 C
7.5k
TP291
4.7k C (1/8W,
ps_fan_high 2012) Q23
1-1D B
2SB1197K (RANK:R)
TP285
E
47k
+24V_FAN
DTC143ZE
SGND
(1608)
R313
22k
R317
7.5k
E
TP288 B
ZD5
Q30
(1/8W, C
TP98
4.7k C 2012) Q27
ps_fan_low 2SB1197K (RANK:R)
B BZX85-C11
1-1D
TP286 1.2W(Pitch=15)
E
R505 47k
47k DTC143ZE
SGND
(1608)
SGND
TONER LED
R272
R311
C
1k TP336
Q28
1W 150 5%
tnr_led
2-1F B 2SD1781K (RANK:R)
TP171
D E
R312
SGND
47k
OPC_FAN +24V_FAN
R271
22k
OPC_FAN
Q20
TP209 R273
B E CN30
2SB1197K (RANK:R)
Q19
7.5k C
TP213
4.7k C
(1/8W,
1
opc_fan 2012) OPC_FAN_POWER
1-1E B
TP206
E
D13
1SS355
DTC143ZE
(1608) SGND
2
PGND
PGND
B2B-PH-K-Y(LF)(SN)
E
F6
TF16AT2.00TTD
+24V +24V_FAN
(to FAN)
F
1 2
3 4
CN21
High voltage power supply (CHG side) High voltage power supply (TR side)
HVPS1
500mA 1
FUSER_FAN_POWER
C503
D12 C101
1SS355
300mA PGND 2
AIR_FAN_POWER
C504
D10
C101
1SS355
PGND
300mA 3
PS_FAN_POWER
C505
hv_trcc_pwm4
D11 C101
1SS355
PGND
80mA 4
TNR_LED_K
C506
C101
5
PGND FAN_PGND
hv_fuser_pwm
6
AIR_FAN_LOCK_N
7
AGND
8
SGND AGND
R228
10k
19.55kHz 9
hv_dev_pwm1 HV_DEV_PWM1
2-6B hv_trcc_pwm3
TP165 C158
C104
10%(B)
R226 SGND
5.1k
19.55kHz 10
hv_grid_pwm2 HV_GRID_PWM2
2-6B
TP166 C156
hv_bcln1_pwm
C333
R225
5.1k SGND
19.55kHz 11
hv_grid_pwm1 HV_GRID_PWM1
2-6B
C149
TP167
C333
R220
10k SGND
19.55kHz 12 hv_trcc_pwm2
hv_dev_pwm2 HV_DEV_PWM2
2-6B
C146
TP168
C104
10%(B)
SGND
R219
5.1k
19.55kHz 13
hv_grid_pwm3 HV_GRID_PWM3
hv_bcln2_pwm
2-6B
C143
TP170
C333
R216
10k SGND
19.55kHz 14
hv_dev_pwm3 HV_DEV_PWM3
2-6B
TP172 C140
C104
10%(B)
R215 hv_trcc_pwm1
5.1k SGND
19.55kHz 15
hv_grid_pwm4 HV_GRID_PWM4
2-6B
TP169 C139
C333
SGND
R211
10k
16
hv_dev_pwm4 HV_DEV_PWM4
2-6B
C138
TP173
C104
10%(B)
R208
L500 150 SGND
17
hv_dcln_pwm HV_DCLN_PWM
2-6C BLM15AG601SN1D
TP174 C136
C101
+3.3V
SGND
hv_bcln1_fb
R203
R205 1k
100
grid_dcdet_n 18
GRID_DCDET_N
2-4B
TP175
C127
C101
R200
SGND L501 150 hv_fuser_fb
19
hv_dcln_on HV_DCLN_PLUS
2-6C BLM15AG601SN1D
C125
TP176
C101
SGND
R266
hv_grid_fb4 U15 13 10
2-3D ANALOG 20 HV_GRID_FB4
14
TP177 12 hv_bcln2_fb
LMV344IPWR
TP73 C201
C101
SGND
R269
hv_dcln_fb U16 13 10
ANALOG 21
2-3F 14 HV_DCLN_FB
TP178 hv_trcc_fb4
12
LMV344IPWR
TP74 C205
C101
SGND
R268
hv_dev_fb4 2 10
U15
2-3E 1 ANALOG 22
HV_DEV_FB4
TP179 3 hv_trcc_fb1
LMV344IPWR
TP75
C203
C101
SGND
R260
hv_dev_fb1 U15 6 10
ANALOG 23
2-3E HV_DEV_FB1
7 hv_trcc_fb3
TP180 5
LMV344IPWR
TP76
C194
C101
SGND
R254
- 2
10
hv_grid_fb3 U12
2-3D 1 ANALOG 24
+ HV_GRID_FB3
TP184 3 hv_trcc_fb2
LMV344IPWR
TP80 C188
C101
SGND
R262
hv_grid_fb1 U15 9 10
2-3D ANALOG 25 HV_GRID_FB1
8
TP182
LMV344IPWR 10
TP78 C196
C101
SGND
R246
- 6
U12 10
hv_dev_fb3
2-3E 7 ANALOG 26
HV_DEV_FB3
TP183 + 5
LMV344IPWR
TP79
C179
C101
SGND
R253
hv_dev_fb2 U12 13 10
2-3E 14 ANALOG 27
HV_DEV_FB2
TP181 12
LMV344IPWR
TP77
C186
C101
SGND
R248
9
hv_grid_fb2 U12 10
ANALOG 28
2-3D 8 HV_GRID_FB2
TP185
10
LMV344IPWR
TP81 C180
C101
SGND 29
A3.3V A3.3V
C123
C103
SGND
R500
30
FAN_PGND
PGND SGND PGND
0
IMSA-9615S-30A-PP-A
3 4
6-9
5 6 7
HVPS2
LASER Scanner
CN20
R184
L503 150
19
HV_TRCC_PWM4
BLM15AG601SN1D
2-6B
TP193 C114 (C)
C101
bd1_n
2-4A
SGND
bd4_n
2-4A
R188
100k
18
HV_FUSER_PWM
2-6C
TP194 C115
C471
ld_ena
SGND 2-6A
TP203
R190
L504 150
17
HV_TRCC_PWM3
2-6B BLM15AG601SN1D
(Y)
TP195 C118 ld_on3
2-6B
C101
TP204
SGND
R193
L505 150
16 ld_pwr_pwm3
HV_BCLN1_PWM
2-6A
2-6C BLM15AG601SN1D
C121 TP304
TP196
C101
SGND
ld_on4
R195 2-6B
L506 150 TP207
15
HV_TRCC_PWM2
BLM15AG601SN1D
2-6B
TP197 C122
(K)
C101
ld_pwr_pwm4
2-6A
SGND TP330
R199
100k
14
HV_BCLN2_PWM
2-6C
C124
TP198
C471
SGND
R202
L502 150
13
HV_TRCC_PWM1
2-6B BLM15AG601SN1D
C128
TP199 (M)
C101 ld_on2
2-6A
SGND
12
24VRET
11
SGND 3.3VRET
ld_pwr_pwm2
2-6A
10
24VRET
PGND
9
A3.3V 3.3V
C134
ld_on1
2-6A
C103
SGND
R251
U13 9 10
ANALOG
2-3F 8 ld_pwr_pwm1
8 HV_BCLN1_FB 2-6A
TP186
10
LMV344IPWR
TP86 C185
C101
SGND
R256
U13 13 10
ANALOG 7
2-3F HV_FUSER_FB
14
TP187 12
LMV344IPWR
TP87 C191 ad_pd3
2-3D 1
C101 TP217
LMV344IPWR
SGND
R250
U13 6 10
2-3F ANALOG 6
7 HV_BCLN2_FB
TP188
5 ad_pd4
LMV344IPWR
TP88 C183 2-3D
7
TP218 LMV344IPWR
C101
SGND
R258
U13 2 10
ANALOG
2-3E 5
1 HV_TRCC_FB4
TP189 3 ad_pd2
LMV344IPWR 2-3D 8
TP82 C192 TP210
C101 LMV344IPWR
SGND
R265
U16 9 10
ANALOG 4
2-3E 8 HV_TRCC_FB1 ad_pd1
TP190
10 2-3D 14
LMV344IPWR
TP83 C200 TP219
LMV344IPWR
C101
F-Cover
SGND
CN37
R264
1
U16 6 10 +5V
ANALOG
2-3E 3
7 HV_TRCC_FB3
TP191
LMV344IPWR 5
TP84 C199
2
C101 FRONT_COVER_SEN
SGND
B2B-EH
R270
U16 2 10
ANALOG 2
2-3E 1 HV_TRCC_FB2
TP192 3 +5V
LMV344IPWR U14 4
TP85 C206
V+
C101 C184
C104
SGND
V-
LMV344IPWR 11
SGND
1
SGND SGND
HLW19S-2C7
+5V
U12 4
V+
C182
C104
V-
LMV344IPWR 11
SGND
+5V
U15 4
V+
C197
C104
V-
LMV344IPWR 11
SGND
+5V
U13 4
V+
C189
C104
V-
LMV344IPWR 11
SGND
CODE
+5V
U16 4
V+
C204
C104
V-
NAME
LMV344IPWR 11
SGND
5 6 7
8
+3.3V
A
R224 R227 SCANNER
68k
68k CN31
1
BD1_N
2
BD4_N
A3.3V
3
SGND SGND
R231
68k
L507 R232
4
LD_ENA
BLM15AG601SN1D
150 C170
C101
L508 R235 SGND
5
LD_ON3
BLM15AG601SN1D 150
C173
C101
SGND
L509 R237
6
LD_PWR_PWM3
BLM15AG601SN1D 150
C174
C101
SGND
L510 R238
7
LD_ON4
B
BLM15AG601SN1D 150
C175
C101
SGND
L511
R244
8
LD_PWR_PWM4
BLM15AG601SN1D 150 C176
C101
SGND
9
A3.3V 3.3V
C507
C103
SGND
10
3.3V
+3.3V
11
VCC5V
+5V
L512
R245
12
LD_ON2
BLM15AG601SN1D C177
150
TP211
C101
SGND
L513 R249
13
LD_PWR_PWM2
BLM15AG601SN1D
150 C181
TP334
C101 C
SGND
L514
R252
14
LD_ON1
BLM15AG601SN1D C187
150
TP214
C101
SGND
L515 R257
15
LD_PWR_PWM1
BLM15AG601SN1D
150 C190
TP361
C101
SGND
16
SGND SGND
R259
U14 2 10
ANALOG 17
AD_PD3
3
C193
TP262
C101
SGND
R261
U14 6 10
18
ANALOG AD_PD4
5
C195
TP265
C101 D
SGND
R263
9 10
U14
ANALOG 19
AD_PD2
10
C198
TP266
C101
SGND
R267
U14 13 10
20
ANALOG AD_PD1
12
C202
TP269
C101
SGND 21
SGND SGND
+5V
22
+5VI
R130 +5VI
0
HLW22S-2C7
(1608)
+3.3V
E
R125
10k
Q18
frnt_cov_sen
10k C
1-3C
TP220
B
TP200
E
47k
SGND
DTC114YE
(1608)
LD control
HVPS control
FAN control
Front-Cover
F
LM9474-001
CIR B512250 (3/5)
8
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