1.3.14 Video I/O - Brother HL-6050 Service Manual

CHAPTER 3 THEORY OF OPERATION

1.3.14 Video I/O

The video signal output from the ASIC is reversed through a transistor and output after being
corrected by the buffer IC.
DATA1-1
3B
TP34
DATA2-1
3B
TP37
ENBN0
2-2D
TP40
ENBN1
2-2D
TP35
CAL1
2-2D
TP38
CAL2
2-2D
TP33
L19
L20
L23 0 TP12
R28
0 TP39
L24 R29
0 TP11
L21 R26
0 TP36
L22
R27
VDD3
TP52
VDON0
2-2D
VDD3
TP54
VDON1
2-2D
TP41
BDN
2-1D
33
33
33
33
0V
VDD5
VDD3
VDD5
U1
C471
TP31 1
C42
3
Q4
2
TP51
R51 C
TC74VHCT08AFT
B
680
E
C3735
R23
100
0V
VDD3
VDD5
U1
C471
TP32 4
C43
6
Q5
5
TP53
C
R54
TC74VHCT08AFT
B
680
E
C3735
R24
100
0V
Fig. 3-16
3-12
TP10
L1
FEEDBACK
6-6C
R30
TP42
L25
100
VDD5
COVER/VDD5I
1-6E/2-2E
C8
0V
C103
U1 14
VCC
GND
7
TC74VHCT08AFT
U1
9
10
TC74VHCT08AFT
U1
12
13
TC74VHCT08AFT
L D
VDD3
CN5
0 (1608)
10
FEEDBACK
0
2
BD
11
DATA1
9
DATA2
5
ENB1
3
ENB2
7
CAL1
6
CAL2
0
L3
1
5V
(1608)
0
L4
4
5VI
(1608)
0
L2
8
0V
(1608)
11FE-BT
DATA1-1
4B
DATA2-1
4B
TP9
8
TP8
11