Samsung ML-1210, ML-1220, ML-1250 Schematics Diagram
Repair Manual
Repair Manual
1. Block Diagram
2. Connection Diagram
3. Schematic Diagrams
CONTENTS
LASER PRINTER
ML-1200 Series
1
1-1
Samsung Electronics
BLOCK DIAGRAM
Repair Manual
1. Block Diagram
1.1 GDI Block Diagram(ML-1210/ML-1220M)
MAIN
S3C46M0X
SDRAM
(8MB)
SMPS
Eng ine
PANEL
B' D
FLASH
MEMORY
(0.5MB)
POWER
CORD
+24V
MOTOR
FAN
EXI T
SE
N
SOR
HVPS
B' D
MHV
OPC GND
SUPPLY
DEV
TH V
BUF F ER
MHVPWM
BI ASPW M
THVPWM
POWER
SW ITCH
IN-LET
LED
4
3
KEY
IEEE 12 84 CABLE
VOL TAGE
DETECT OR
Crystal
10M H z
Ma i n
Clo ck
Oscillator
44 MHz
Vi deo
Clock
Po werOnRes e t
CPU
Jupiter3
USB
74LVX161284
Line
Transc ei v e r
PC
+5V
FS781 BZB
SOLENOIDE
DEV_FUSE
LSU
1-2
BLOCK DIAGRAM
Samsung Electronics
Repair Manual
MAIN
S
Option
Up to
68MB
DRA M
(4
(2MB)
MB)
LSU
Eng i ne
PANEL
B' D
FLASH
MEMORY
POWER
CORD
+2 4V
MOTOR
SOLENOID
FAN
EXIT
SE
N
SOR
HVPS
B' D
MHV
OPC GND
SUPPLY
DEV
TH V
MHVPWM
BI ASPW M
THVPWM
POWER
SWITCH
LED
4
3
KEY
IEEE 12 84 CABLE
Oscillator
48 MHz
USB
PC
DEV_FUSE
+5 V
IN-LET
SMPS
C P U
S3C46C0X01
74HCT273
74ACT273
Devided by
74HC406ON
Crystal
6.7149 MHz
USB Driver
USBN9602-28M
PowerOnReset
Main
Clock
Video
Clock
VOLTAGE
DETECTOR
Oscillator
20 MHz
Oscillator
44 MHz
1.2 PCL Block Diagram(ML-1250)
2
2-1
Samsung Electronics
CONNECTION DIAGRAM
Repair Manual
2. Connection Diagr am
2.1 GDI Connection Diagram(ML-1210/ML-1220M)
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
1
2
3
4
5
6
+24V_T
+24VGND
*PMOTOR
+3. 3V
EXT_CLK
*HSYNC
+5V
+5V GND
*LD_ON
VDO
+5V GND
LSU
POL YGON
MOTOR
LD DIODE
+5V
+5V GND
LED_E RROR
LED_PAPER
LED_DATA
LED_TONER
*KEY_TONER
*KEY_CANCE L
*KEY_DEMO
1
2
3
4
5
6
7
8
9
LED
DISPLA Y
PANEL
1
2
3
4
5
6
7
8
9
1
2
+5V
PTL
PTL LED ARRA Y
1
2
+24V_T
+24V GND
THVPW M
*THV_EA
THVRE AD
*MHVPWM
BI ASPW M
+5V
+5V GND
1
2
3
4
5
6
7
8
9
HVP S
1
2
3
4
5
6
7
8
9
THERM_A
THERM_B
1
2
1
2
THERMI STOR
+24V
+24VS
1
2
3
1
2
3
COV ER
SWITCH
+5V
*PEMPT Y
1
2
3
4
1
2
3
4
*FEED
+5VGND
SENSOR
BOARD
36
PI N
HOST
COM P UTER
IEEE1284
COMP ATI A BLE
CABLE
J1
CN9
CN7
CN11
CN12
CN13
CN6
CN8
CN5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SMPS
+5VGND
+5V
+5V GND
+5V
+5V GND
+5V
+24V GND
+24V
+24VS
+24V GND
+24V
+24V GND
+24V
EXIT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
FUSER ON
17
18
19
20
21
22
23
24
ENGINE
+24VS
FAN
DEV_FUSE
*NEW_DEVE
*
EGM O T _A1
EGMOT_PHA
*EGMOT_B1
EGMOT_PHB
4PI N
CONNÂECTO R
for
USB
USBCABLE
CN3
DCU
CN
1
+5V
DC U _DATA
1
2
3
4
1
2
3
4
DC U _CLK
+5V G ND
Not Used
ENGINE+ SMPS
B
Unification
'd
CLUTCH
SOL E -
NOID
CN1
DEV_FUSE
CN3
CN4
FAN
FU S E R
CN502
STEP-
PING
M
O
TOR
CN2
CN5
GDI
Main
Board
2-2
CONNECTION DIAGRAM
Samsung Electronics
Repair Manual
1
2
3
4
5
6
7
8
9
10
11
+24V_SLEEP
+2 4VGND
*P
LREADY*
MOTOR
EXT_CLK
*HSYNC
+5 V
+5 VGND
*LD_ON
VDO
+5 VGND
LSU
POL YGON
MOTOR
LD DIODE
+5 V
+5 V GND
KEY_TONER*
KEY_CANCEL*
KEY_DEMO*
1
2
3
4
5
6
7
8
9
LED
DISPLA Y
PANEL
1
2
3
4
5
6
7
8
9
+5 V
PTL
PTL LED AR RA Y
1
2
+24V_SLEEP
+24V GND
THVP WM
*THV_EN
THVRE AD
*MHVPWM
BI ASPW M
+5V
+5V GND
HVP S
1
2
3
4
5
6
7
8
9
THERM_A
THERM_B
1
2
THERMI STOR
+24V
+24VS
1
2
3
COV ER
SWITCH
+5V
*PEMPTY
1
2
3
4
FEED_SENSOR*
+5V GND
SENSOR
BOARD
36
PI N
HOST
COM P UTER
IEEE1284
COMP ATI ABLE
CABLE
J1
CN12
CN6
CN8
CN11
CN5
CN4
CN2
CN3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SMPS
ENGINE
4PI N
CONNÂECTO R
for
USB
USBCABLE
CN7
DCU
CN
9
+5V
DC U _DATA
1
2
3
4
1
2
3
4
DC U_CLK
+5V G ND
Not Us ed
ENGINE+ SMPS
B
Unification
'd
SOL E -
NOID
CN1
DEV_FUSE
CN3
CN4
FAN
FU S E R
CN502
S TEP-
PING
M
O
TOR
CN2
CN5
PCL
Main
Board
1
2
3
4
5
1
2
3
4
5
6
1
2
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
1
2
1
2
3
1
2
3
4
LED_ERROR
LED_PAPER
LED_DATA
LED_TONER
+5V GND
+5V
+5V GND
+5V
+5V GND
+5V
+24V GND
+24V
+24V GND
+24V
+24V GND
+24V
EXIT
+24VS
FUSER ON
+24VS
MOTOR B*
CLUTCH
MOTOR_PB
FAN
DEV_FUSE
MOTOR_A*
NEW_DVE*
MOTOR_PA
2-2 PCL Connection Diagram(ML-1250)
3
3-1
Samsung Electronics
SCHEMATIC DIAGRAMS
Repair Manual
3. Schematic Diagrams
3.1 GDI Main Circuit Diagram (1/5)
3-2
SCHEMATIC DIAGRAMS
Samsung Electronics
Repair Manual
Main Circuit Diagram (2/5)
3-3
Samsung Electronics
SCHEMATIC DIAGRAMS
Repair Manual
Main Circuit Diagram (3/5)
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