Brother HL-4040CN, HL-4050CDN, HL-4070CDW Service Manual page 315

Engine PCB Circuit Diagram (1/5)
1
2
U8
C70 TP3
75
X1
C18P
1
X1
SGND R114
A 1M
2
R113
C75 TP97 1k
73
X2
C22P TP4
SMD-49 10.00000MHZ
RA1
47
23
P00/D0
cpu_d0 8
2-2A 1
24
TP1
cpu_d1 P01/D1
2 7
2-2A 25
cpu_d2 P02/D2
2-2A 3 6
26
cpu_d3 P03/D3
4 5
2-2A
27
cpu_d4 P04/D4
2-2A 1 8
28
TP2
cpu_d5 7 P05/D5
2-2B 2
29
cpu_d6 P06/D6
3 6
2-2B 30
cpu_d7 P07/D7
2-2B 4 5
RA2
47
B
pnew_sen1
2-8B
pnew_sen2
31
2-8C
P10/D8
pnew_sen3
2-8D 32
P11/D9
pnew_sen4
33
2-8E
P12/D10
34
P13/D11
35
sen_led_on1 P14/D12
4-1B/4-1E/5-1A
36
sen_led_on2 P15/D13
2-6B
37
sen_led_on3 P16/D14
5-6A R145 10k 38
SGND P17/D15
TP5
+3.3V
RA4
RA3
10k 10k
RA5
47
42
cpu_a0 P40/A0
1 8
2-1A
43
C TP100
cpu_a1 P41/A1
2-1A 2 7
44
cpu_a2 P42/A2
2-1A 3 6
45
cpu_a3 P43/A3
4 5
2-1A 46
cpu_a4 P44/A4
2-1A 1 8
47
TP101
cpu_a5 P45/A5
2 7
2-1B
48
cpu_a6 P46/A6
3 6
2-1B 49
cpu_a7 P47/A7
2-1B 4 5
RA6
47
R148
47 PD3/TB1OUT0/RXD2/INT7
+3.3V
cpu_a8
2-1B R141 47 PD4/TB1OUT1/SCLK2/CTS2
cpu_a9
2-1B
R147
R142
10k 10k
50
P50/A8
51
TP6
P51/A9
52
TP7
P52/A10
fan_lock_n
3-1B
R138 53
10k
SGND P53/A11
54
R136 10k
TP9
+3.3V P54/A12
55
R135 10k TP10
D +3.3V P55/A13
56
TP11
ps_fan_high P56/A14
3-1C
57
ps_fan_low P57/A15
3-1C
fuser_fan_low
3-1A
fuser_fan_high
3-1A
air_fan
3-1B
58
opc_fan P60/A16
3-1E 59
P61/A17
60
P62/A18
61
P63/A19
62
TP99
lt1_cas_sen P64/A20
5-5E
63
lt1_lift_sen P65/A21
5-5F
64
lt1_reg_sen P66/A22
5-5F
65
lt1_pe_sen P67/A23
5-5F
E
+3.3V
R104 R105 R106
47k 10k 10k
R94 47 82
cpu_rd_n P70/RD
2-1A
R93 83
47
TP12
cpu_wr_n P71/SRWR
2-1A
R92 47 84
TP13
vsync_n P72/SRLLB
7D
R103 47 85
TP14
ctl_cmdrdy_n P73/SRLUB
7D
21
TP15
reg_r_sen P74/INT0
5-4D
80
ctl_stsreq_n P76/XT1
7D 79
eject_sen P77/XT2
5-2D
+3.3V
R126
4.7k
F
66
boot_n P80/CS0/TA1OUT(BOOT)
5E
67
cpu_cs_n P81/CS1/TA3OUT
2-1A R128 47 68
TP17
P82/CS2
69
TP18
P83/CS3/WAIT/TA5OUT
TP19
TMP92FY23FG
TMP92FD23AFG
1 2
3 4
22
DVCC22 +3.3V
41
DVCC41
76
DVCC76
81
DVCC81
20
System RESET
DVSS20
39
DVSS39 U7
74 2 4
DVSS74 VDD OUT
+3.3V
88 3
TP41
DVSS88 SGND CD
C103
TP40
R117 C59
2 10 1
AVCC/VREFH +3.3V VSS
SGND
C57
TP350 C76 C473 S-80928CLNB-G6YT2G
C78 4 3
C105 10%(B) (CMOS output)
C104
(1608)
1
AVSS/VREFL SGND SC-82AB
1 2
R95
1k
TP39
77 (For ESD) cpu_rst_n
RESET
C68
C102
SGND
78
AM0 +3.3V
72
AM1
40 R146
NMI +3.3V
10k
TP22
ctl_rst_n_in
7E
3
PC0/TA0IN
4
PC1/INT1 CRNS_intr0_n
5 2-2A
TP104
PC2/INT2 CRNS_intr1_n
2-2A
6
TP105
PC3/INT3 frnt_cov_sen
3-8E
+3.3V
R102 R118
47k 47k
19
PD0/TB0OUT0/INT4 opc1_sen
2-1C/5-6C
70
opc2_sen
PD1/TB1IN0/INT5
2-1C/5-5C
71 R119
PD2/TB1IN1/INT6/TXD2 status
7C
47
86
TP23
command
7D
87 R91
ctl_cmdreq_n
7D
47
TP24
R121 10k
7
PF0/TXD0 +3.3V
8 R120 10k
TP25
PF1/RXD0
9 R122 47
TP26 20MHz
PF2/SCLK0/CTS0/CLK CRNS_clk
2-1A
10 R124 100
TP27
PF3/TXD1 debug_txd
5E
11
TP28
debug_rxd
PF4/RXD1
5E
12
PF5/SCLK1/CTS1 CRNS_rst_n
2-1A
TP103
R123 R127
10k 10k
SGND
100 R112 33
ANALOG
ANALOG 0.5
PG0/AN0/KI0 dens_sen1
5-7D
99 R109 33
ANALOG TP106 ANALOG 0.5
PG1/AN1/KI1 dens_sen2
5-7D
98 R98 33
ANALOG TP107 ANALOG 0.3
PG2/AN2/KI2 heat_thm1
5-2E
97 R96 33
ANALOG TP108
ANALOG 0.3
PG3/AN3/KI3 heat_thm2
5-2F
96 R86 33
ANALOG TP109 ANALOG 0.3
PG4/AN4/KI4 el_current
R87 4-6F
95 33
ANALOG TP110 ANALOG 0.3
PG5/AN5/KI5 th1_sen
5-6E
94 R88 33
ANALOG TP111 0.3
PG6/AN6/KI6 ANALOG hu1_sen
5-6E
93 ANALOG R89 33
TP112 ANALOG 0.3
PG7/AN7/KI7 th2_sen
5-7C
TP113
+3.3V
10k 10k
R101 R90
SGND
92 R100 100
PL0/AN8 motor_model
4-4B/4-4C/4-4E
91
TP29
PL1/AN9
90
TP30
PL2/AN10 fuser_det
5-2E
89
TP31 ANALOG ANALOG 0.3
PL3/AN11/ADTRG th3_sen
5-5A
R84
TP32
C66
C55 33
C101
C101
SGND +3.3V
+3.3V
13 R129
R131
PN0/SCK0 SGND
4.7k R132
10k
14
TP33 4.7k
PN1/SO0/SDA0 EEPROM
U9
15
TP34 6 8
PN2/SI0/SCL0 SCL VCC
+3.3V
18
TP35
PN3/SCK1 rear_cov_sen
5-5D C82
16
7 C104
TEST
PN4/SO1/SDA1 dp_sda
5-8B
17
TP37 1 4
PN5/SI1/SCL1 dp_scl A0 VSS SGND
5-8A
TP38 2
A1
3 5
A2 SDA
SGND
BR24L04F-WE2
3 4
6-7
5
6 7
LVPS1 FG Connection
CN6 Low voltage power supply
15
+3.3V
+3.3V
14
+3.3V
R333
13
+3.3V
SGND
FG1
0
12 TP114
+3.3V (1608)
11
+3.3V
10
SGND C4
C1
EEE1AA101SP
9 C103
SGND 10V
C100
8
SGND ( 6.3)
7
SGND
6
SGND
FG2 R335
5
SGND
SGND
0
4 TP115
SGND SGND (1608)
3
+6.8V
2
+6.8V
+6.8V
C500
OT500
C103
PGND
FG1
SGND
Q2
HEAT_ON_n 1 10mA(min)
C 4.7k
C510
C101 heat_on
S15B-PASK-2(LF)(SN) B 2-2E
(For EMI)
TP290
E 47k
SGND DTC143ZE
(1608) R6 PGND
LVPS2
CN5 0
PGND FG4
6
24VRET
FG2 OT7
5 PGND
24VRET
4
24VRET PGND
C2
R10
50VDC
SGND
C103
0
(1608)
(1608)
3
+24V
+24V Main Controller I/F
2
+24V
1 ctl_bd0_n
+24V
cross
S06B-PASK-2(LF)(SN)
ctl_bd4_n
Main Controller
Power supply CTL_Power
CN23
+3.3V
10
+3.3V
+3.3V
C502
status
9 C103
+3.3V
C221 8
+3.3V
EEE1AA101SP C219
SGND
10V C100 C103 7 SGND
( 6.3)
6
SGND command
5
SGND SGND
4
+6.8V
+6.8V C501
C103 3
+6.8V
ctl_stsreq_n
SGND C228 2
PGND
PGND
50VDC
C103
(1608)
1
+24V +24V vsync_n
S10B-PASK-2(LF)(SN)
ctl_cmdreq_n
ctl_cmdrdy_n
ctl_rst_n_in
Debug Serial
+3.3V
DEBUG
CN18
R153 R154
R150
R149
47k 47k 47k 1
47k +3.3V
+3.3V
2
debug_txd TXD
3D
3
debug_rxd RXD
3D
4
boot_n BOOT_N
1F
5
SGND GND
6
debug_log_txd LOG_TXD
2-1F
B6B-PH-K-R(LF)(SN)
CODE
NAME
5 6 7
8
A
R14
SGND
0 FG3
TP117
(1608)
SGND
R151
0
(1608)
TP116
R11 FG4
FG5
SGND
0
TP118
(1608)
OT2
PGND
FG3
B
PGND
OT6 OT5 PGND
PGND PGND
OT4
FG4
FG5
PGND
CTL I/F
CN28
10
BD0n
2-1F
C236
C101
(For EMI)
SGND
C
9
BD1n
2-1F
C235
C101
(For EMI)
8
SGND GND
SGND
7
STATUS
3C
+3.3V
R343
R344 47k
TP43
33
6
COMMAND
3C
+3.3V
C234
C101
R342
SGND
R341 47k
TP44 33
5
STSREQn
1F
C233
C101
SGND
4
VSYNCn
1E
C232
C101 D
(For EMI)
SGND
3
CMDREQn
3D
C231
C101
(For EMI)
SGND
2
CMDRDYn
1E C230
C101
(For EMI)
SGND
R339
33
1
E_RSTn
3C
TP119
R340
C229 B10B-CZHK-B-1(LF)(V)
10k
C101
SGND SGND
E
Engine CPU
EEPROM
System RESET
Debug Serial
Main Controller I/F
Main Controller Power
Power Connector
F
LM9474-001
CIR B512250 (1/5)
8
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