Samsung ML-4600/XET Service Manual page 93

Schematic Diagrams
Main Circuit Diagram(5/9)
D(16:31)
5V
IOCS0*
C2
33pF
RD*
WE*
IOCS1*
C1
33pF
RESET*
Samsung Electronics
U2
20
VCC B1
2 B2 17
D(16)
A1
3 B3 16
D(17)
A2
4 B4 15
D(18)
A3
U35-3 5
D(19) B5
A4
10 74ACT32SCX
D(20) 6 B6 13
A5
8
7 B7 12
D(21)
A6
9
D(22) 8 B8 11
A7
D(23) 9
A8
19
_G
1
DIR GND
U35-2
74ACT32SCX 74ACT245
4
6
R5
33
5
C155
100pF
5V
U6
C139
74LS273
100nF
20
VCC _MR
3
D(16)
D0
4
D(17)
D1 Q0
7
D(18)
D2 Q1
8
D(19)
D3 Q2
D(20) 13
D4 Q3
D(21) 14
D5 Q4
D(22) 17
D6 Q5
18
D(23)
D7 Q6
10
GND Q7
CP
5V
11
U35-1
14
74ACT32SCX
1
3
2
C70 C154
100nF 100pF
7
U35-4
74ACT32SCX
13
11
12
C152
100pF
5V
18
E2PROM_DO
KEY_TONER*
KEY_CANCEL*
KEY_DEMO*
14
DCU_DIN
P_EMPTY*
COVER_OPEN
P_EXIT*
C108
100nF
10
1
U39-3
D(16)
74F14
6
2 5
D(17)
WR_FLASH*
5
D(18)
6
D(19)
E2PROM_DI
9 D(20)
E2PROM_SK
12 D(21)
E2PROM_CS
15 D(22)
LED_ERROR
16
D(23)
LED_PAPER
19
LED_DATA
LED_TONER
5V
C137
100nF U39-1
74F14
14
2
1
5V
7
U1
C107
74LS273
100nF
U38-2
20 1
VCC _MR
DM7407MX
3 3 4
D0
4 2
D1 Q0
U39-2
7 5 U38-3
D2 Q1
74F14
DM7407MX
4
8 6 3 5 6
D3 Q2
13 9
D4 Q3
14 12
D5 Q4
17 15
D6 Q5
18 16
D7 Q6
10 19
GND Q7
CP
11
C67
1nF
THV_EN*
LD_ON*
5V
R33
P_MOTOR
5.1K
DCU_DOUT
DCU_CLK
CLUTCH
C31
1nF
FAN
PTL
10-5