1.3.11 Engine I/O; 1.3.12 Panel I/O - Brother HL 5030 - B/W Laser Printer Service Manual

CHAPTER 3 THEORY OF OPERATION

1.3.11 Engine I/O

The interface with the engine PCB is by full-duplex synchronous serial method, of which
transfer rate is 520kbps.
<HL-5030/5040/5050>
<HL-5070N>
ENGDI

1.3.12 Panel I/O

The interface with the panel PCB is by full-duplex synchronous serial method.
<HL-5030/5040/5050>
<HL-5070N>
U5
253
ENGRSTN
254 255
ENGDI ENGDI ENGDO
3D
Aurora
U7
253
ENGRSTN
254 255
ENGDI ENGDO
3D
Aurora
LED0
TP210
3D
SW0
3E
LED2
3D
LED1
3D
LED3
TP211
3E
SW1
3E
LED4
3E
0V
LED0
TP210
3D
SW0
3E
LED2
3D
LED1
3D
LED3
TP211
3E
SW1
3E
LED4
3E
0V
VDD3
TP200
TP202
R104 1k
TP203
TP201
R100
100
TP204
ENGDI
2D
VDD5
0V
Fig. 3-21
VDD3
TP200
TP202
R142
1k
TP201 TP203
R138
100
TP204
ENGDI
1D
VDD5
0V
Fig. 3-22
VDD3
MMZ1608Y601B
R109
1k
MMZ1608Y601B
MMZ1608Y601B
MMZ1608Y601B
R106
1k
MMZ1608Y601B
0V
VDD5
Fig. 3-23
VDD3
R148
1k
MMZ1608Y601B
MMZ1608Y601B
MMZ1608Y601B
R145
1k
MMZ1608Y601B
Fig. 3-24
3-14
VDD3
ENGINE
TP205
R103
100
VDD3
ENGINE
L10
0
L14
0
L12
0
TP205
R141
L13
0
100
L15
0
L11
0
PANEL
CN9
L15
4
LED0/PNLRSTN
5
SW0/PNLDI
L16
6
LED2/PNLDO
L17
7
LED1/PNLCLK
L13
2
LED3
LED 1-8 PIN
1
PANEL 4-9 PIN
SW1
L14
Buzzer+LED
3
LED4
8
GND
9
VDD5
B9B-PH-K-S
PANEL
CN10
MMZ1608Y601B
L18
4
LED0/PNLRSTN
5
SW0/PNLDI
L19
6
LED2/PNLDO
L20
7
LED1/PNLCLK
L16
2
LED3
1
SW1
L17
3
LED4
L21
0
8
GND
0V
L22 0
9
VDD5
VDD5
B9B-PH-K-S
LED 1-8 PIN
PANEL 4-9 PIN
BUZZER+LED 2-9 PIN
CN8
1
3.3V
5
RESET
3
TXD
4
RXD
6
5V
2
0V
B6B-PH-K-S
CN9
1
3.3V
5
RESET
3
TXD
4
RXD
6
5V
2
0V
B6B-PH-K-S
2-9 PIN