Eeprom; Reset Circuit; 1.3.10 Engine I/O; 1.3.11 Panel I/O - Brother DCP 8040 - B/W Laser - All-in-One Service Manual

1.3.8

EEPROM

The EEPROM is BR24126 type of two-wire method with a 8192 x 8bit configuration.
1.3.9

Reset circuit

The reset IC is a R3112N281C. The reset voltage is 2.8V (typ.) and the LOW period of reset is
22.4ms (typ.)

1.3.10 Engine I/O

The interface with the engine PCB is by full-duplex synchronous serial method, of which
transfer rate is 520kbps.
254
ENGDI
3D

1.3.11 Panel I/O

The interface with the panel PCB is by full-duplex synchronous serial method.
U15
Aurora
Fig. 3-10
U5
C75
5
CD
C103
4
TP310 NC
3
0V GND
R3112N281C
Fig. 3-11
U7
TP200
253
ENGRSTN
TP201
255
ENGDI ENGDO
ENGDI
1D
Aurora
Fig. 3-12
Fig. 3-13
MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN
VDD3
C71
C103
2
VCC
C77
TP4
R84
1
VOUT
68
C101
VDD3
TP202
R142
1k
TP203
R138
100
TP204 R141
100
VDD5
0V
3-7
SERVICE MANUAL
0V
VDD3
ENGINE
CN9
L10
0 1
3.3V
L14
0
5
RESET
L12
0
3
TXD
TP205
L13
0 4
RXD
L15
0 6
5V
L11
0 2
0V
B6B-PH-K-S