1.3.13 Video I/O - Brother HL 5030 - B/W Laser Printer Service Manual

1.3.13 Video I/O

The video signal output from the ASIC is reversed through a transistor and output after being
corrected by the buffer IC.
<HL-5030/5040/5050>
VDD3
R22
680
TP230
VDON0
3D
BDN
TP232
2D
ENBN0
3D
<HL-5070N>
VDD3
R21
680
TP230
VDON0
2D
BDN
TP232
1D
R12
ENBN0
2D
VDD5
U1
C14
1
B
TP233
2
C471
A
Q1
TP231
C
R21
TC7SH08FU
B
680
E
C3735
R6
R14
680
0
0V
R8
0
VDD5
U2
VCC
1/10W R15
C27
330
1
B GND
TP233
2
C471
A
Q3
TP231
C
R19
TC7SH08FU
B
680
E
C3735
R16
R10
680
0
0V
0
VDD3
5
VCC
VDD5
C3
C103
3
0V
GND
4
Y
0V
VDD5
TP234
Fig. 3-25
VDD3
5
VDD5
C18
C103
3
0V
4
Y
0V
VDD5
TP234
0V
Fig. 3-26
3-15
HL-5030/5040/5050/5070N SERVICE MANUAL
VDD3
C6
R5
C103
1k
0
L1
TP235
R9
100
0V
VDD3
C21
R8
C103 1k
0
L3
0
L4
0
L5
TP235
R13
0
L7
100
L6 0
0V
CN3
5
DATA1
4
GND
3
+5V
1
BD
2
ENB1
CN1
5
DATA1
4
GND
3
+5V
1
BD
2
ENB1