1.3.12 Video I/O; 1.3.13 Scanner Control - Brother DCP 8040 - B/W Laser - All-in-One Service Manual

CHAPTER 3 THEORY OF OPERATION

1.3.12 Video I/O

The video signal output from the ASIC is reversed through a transistor and output after being
corrected by the buffer IC.
VDON0
2D
BDN
1D
ENBN0
2D

1.3.13 Scanner control

VDD3 VDD5
U2
1/10W R15
R21
C27
330
1
680
B
TP233
2
C471
A
Q3
TP230 TP231
C
R19
TC7SH08FU
B
680
E
C3735
R16
680
0V
TP232
R12
0
VDD3
5
VDD5
VCC
C18
C103
3
GND
0V
4
Y
0V
VDD5
TP234
R10
0
0V
Fig. 3-14
Fig. 3-15
3-8
VDD3
C21
CN1
R8
C103 1k
0
L3
5
0
L4
4
0
L5
3
TP235
R13
0
L7
1
100
0
L6
2
0V
DATA1
GND
+5V
BD
ENB1