Page 1
Repair Manual
Repair Manual
1. Block Diagram
2. Connection Diagram
3. Schematic Diagrams
CONTENTS
LASER PRINTER
ML-1200 Series
Page 2
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
Page 3
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)
Page 4
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
Page 5
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)
Page 6
3
3-1
Samsung Electronics
SCHEMATIC DIAGRAMS
Repair Manual
3. Schematic Diagrams
3.1 GDI Main Circuit Diagram (1/5)
Page 7
3-2
SCHEMATIC DIAGRAMS
Samsung Electronics
Repair Manual
Main Circuit Diagram (2/5)
Page 8
3-3
Samsung Electronics
SCHEMATIC DIAGRAMS
Repair Manual
Main Circuit Diagram (3/5)
Page 9
3-4
SCHEMATIC DIAGRAMS
Samsung Electronics
Repair Manual
Main Circuit Diagram (4/5)
Page 10
3-5
Samsung Electronics
SCHEMATIC DIAGRAMS
Repair Manual
Main Circuit Diagram (5/5)
Page 11
3-6
SCHEMATIC DIAGRAMS
Samsung Electronics
Repair Manual
3.2 PC L Main Circuit Diagram (1/9)
Page 12
3-7
Samsung Electronics
SCHEMATIC DIAGRAMS
Repair Manual
PCL Main Circuit Diagram (2/9)
Page 13
3-8
SCHEMATIC DIAGRAMS
Samsung Electronics
Repair Manual
PCL M a i n Circuit Diagram (3/9)
Page 14
3-9
Samsung Electronics
SCHEMATIC DIAGRAMS
Repair Manual
PCL Main Circuit Diagram (4/9)
Page 15
3-10
SCHEMATIC DIAGRAMS
Samsung Electronics
Repair Manual
PCL M ainCircuit Diagram (5/9)
Page 16
3-11
Samsung Electronics
SCHEMATIC DIAGRAMS
Repair Manual
PCL Main Circuit Diagram (6/9)
Page 17
3-12
SCHEMATIC DIAGRAMS
Samsung Electronics
Repair Manual
PCL M a i n Circuit Diagram (7/9)
Page 18
3-13
Samsung Electronics
SCHEMATIC DIAGRAMS
Repair Manual
PCL M a i n Circuit Diagram (8/9)
Page 19
3-14
SCHEMATIC DIAGRAMS
Samsung Electronics
Repair Manual
PCL M a i n Circuit Diagram (9/9)
Page 20
3-15
Samsung Electronics
SCHEMATIC DIAGRAMS
Repair Manual
5V 18V
24VS
24VS
18V
24VS
5V
SAMSUNG ELECTRONICS
TITLE
REF. NO
DATE 01/01/04
1.0
1 OF 2
DESIGNED CHECKED
REV.
APPROVED DRW. NO
SIZE A4
SWALLOW-HVPS
CN1-#6
U2-B
CN1-#7
U2-A
JH.CHO
IN
GND
OUT
U3
KA7818
7407
7407
JC
R422
5.6K
R411
2.2K
R401
100
Q401
A708-Y
R412
2K
R403
110KF
VR401
50K
R402
56KF
C408
104
C401
222
R405
220KF
R406
2.2KF
C402
103
R407
240K
R408
47K
R409
430
C403
333
Q402
D526-Y
R410
1W 3
C404
3KV 471
D401
4KV
R413
MGR1/2W 6MF
R414
MGR1/2W 6MF
R416
MGR1/2W 15MF
R417
MGR1/2W 15MF
R426
MGR1/2W 100KF
R502
2.2K
R505
100KF
R504
2K
R503
100
R507
27K
C503
104
R508
86.6KF
R509
12KF
R513
1W 3
R512
430
R511
47K
C504
333
C1
104
C2
104
C3
35V 47uF
+
R515
MGR1/2W 15MF
R514
MGR1/2W 15MF
ZD501
1W 100V
D502
4KV
Q502
D526-Y
C502
222
C501
104
R516
MGR1/2W 50K
R517
MGR1/2W 15MF
3 4
ZD401
1W 130V
R501
5.6K
R506
100KF
Q501
A708-Y
C506
3KV 471
C405
2KV 680
C505
2KV 680
D402
4KV
VR501
50K
C406
3KV 471
D501
1N4148
R510
47K
R519
MGR1/2W 50K
T501
KAB-006
1
4
2
5
7
6
1 2
U1-C
KA324
+
-
10
9
8
GIL-S-9P-S2T2-EF
CN1
1
2
3
4
5
6
7
8
9
T401
KAB-006
1
4
2
5
7
6
D403
1N4148
R404
33K
U1-D
KA324
+
-
12
13
14
D111
1N4148
MHV-PWM
BIAS-PWM
18V
MHV
DEV
SUPPLY
OPC
24VS
A-GND
THV-PWM
THV-EA
THV-READ
MHV-PWM
BIAS-PWM
5V
D-GND
3.3 HVPS Circuit Diagram (1/2)
Page 21
3-16
SCHEMATIC DIAGRAMS
Samsung Electronics
Repair Manual
5V
18V
24VS
18V
18V
18V
24VS
24VS
D-GND
CN1-#5
CN1-#4
CN1-#8
TITLE
DRW. NO
REF. NO
SIZE A4
DATE 01/01/04
SWALLOW-HVPS
REV.
1.0
2 OF 2
DESIGNED CHECKED APPROVED
SAMSUNG ELECTRONICS
CN1-#3
7407
JH.CHO
U2-F U2-E
7407 7407
JC
R205
1K
R206
100
Q203
A708-Y
R207
2K
R208
30KF
R209
110KF
VR201
50K
C201
103
C202
331
R210
510KF
D202
1N4148
D201
1N4148
R211
1MF
R212
470K
C203
472
D203
1N4148
ZD201
5.6V
ZD202
7.5V
R213
2.2K
R214
1.2K
R215
430
Q204
D526-Y
C206
6KV 471
D207
6KV
C207
6KV 471
R216
BR1/2W 30MJ
R217
BR1/2W 200MG
R218
MGR1/2W 100KF
C204
473
C306
2KV 680
C307
3KV 471
D303
4KV
C308
3KV 471
Q303
D526-Y
R314
2.2KF
VR302
5K
C305
333
R311
100KF
Q302
A708-Y
R310
2.2K
R308
33K
Q301
A708-Y
R307
33K
R309
2.2K
R306
26.1KF
R304
200KF
R305
5.1KF
VR301
10K
C304
500V 103
C303
333
D302
1N4148
D301
1N4148
R303
100KF
R302
33K
C302
102
R301
470K
C301
222
C4
104
R3
1/2W 560
ZD1
5.6VC7104
C101
35V 47uF
+
R315
BR1/2W 30MJ
C205
6KV 101
D304
4KV
D204
6KV
U1-B
KA324
+
-
5
6
7
R316
1KF
R317
2KF
13 12 11 10
T201
HVT-2A
1
4
2
5
7
6
R201
10K
U1-A
KA324
+
-
3
2
1
4
11
D205
6KV
C208
6KV 471
D206
6KV
C209
6KV 471
T301
KAB-006
1
4
2
5 6
7
U2-C
9 8
14
7
THV-PWM
5V
THV-EA
THV
THV-READ
HVPS Circuit Diagram (2/2)
Page 22
3-17
Samsung Electronics
SCHEMATIC DIAGRAMS
Repair Manual
+24V 1.8A
+5V 1.0A
GND
NO MARKING RESISTOR 1/4W-J (5%)
1
3
5
6
11
10
7
12
GND
CN5-14
CN5-13,15
CN5-16
EER2828
+5V +24VS
GND GND
1
2
17
4
963181551612
7
14
8
13
1A
1B
2A
2B
PHASE1
+ENABLE1
RC1
SENSE1
E1
VREF
GND
E2
SENSE2
RC2
VCC
VBB
U1
A2918SWH
11 5
PHASE2
+ENABLE2
CN2
35303-0450
+5V
GNDGNDGNDGND
+24VS +24V
CN4
35301-0350
GND
GND
CN1
35303-0250
F501
125V 8A
R502
1/2W
560K
TNR501
TVR 14D 221K
C503
224
LF501
APOLLO12
D502
UF1010
C508
200V 470uF
V501
SCK-054
T501
NP
NB
N24
PC501
K1010H
PC501
K1010H
U503
KA431
2
3
1
L502
10uH
CN501
L
F.G
N
C505
104
C501
222MAD
C502
222MAD
C511
103
R517
82
1W
R509
3W
47K
R507
30
C509
50V 33uF
C510
2A 223K
R510
1W
0.3
D504
ER1002FCT
C520
50V 1000uF
C515
10V
1000uF
R511
4.3K
R512
330
R516
2.2K-F
R515
2.2K-F
C518
10V 470uF
-+
BD501
FL406
C506
222MAD
C517
104
C519
104
R521
150
R520
47K
OP501
ITR8406-S
R519
500
5W
TNR502
TVR 10D 561K
LF502
APOLLO12
CN502
1
2
U501
BTA12-600
PC502
KMOC3063
L501
300uH
C504
333
R501
1W 47
FUSIBLE
R503
1/4W
100
R508
1W 180
FUSIBLE
R513
1/2W
1.5K
R504
68K
R505
1W
47K
F502
125V 3A
C513
1uF
R518
22
R514
22
C522
1KV 102
C514
1KV 102
N5
D503
SB1040FCT
R506
1W
47K
U502
STRT-G6153
VCC
5
DRAIN
1
OCP2GND3FB
4
D501
ER102
B501
APOLLO12
C507
104
C512
2KV 221K
C521
50V 1000uF
C8
50V 47uF
C3
50V 47uF
C1
331
C2
331
C5
331
R11
56K
R10
1K
C7
103
R6
2W 0.37
R8
1K
R5
2W 0.37
C6
103
R15
56KC4331
R7
1.2K
R9
17.4K-F
R13
2.2K
R2
5.6K
Q3
1008-Y
D3
1N4003
R12
510
R1
5.6K
Q1
1008-Y
D2
1N4003
CN5-7,9,11
CN5-8,10,12
CN5-1,3,5
CN5-2,4,6
EXIT
+24VS2
FUSER_ON
EGMOT_PHA
EGMOT_PHB
+EGMOT_A1
+EGMOT_B1
1
2
3
4
FAN
1
2
3
CLUTCH
1
2
3.4 SMPS Circuit Diagram (110V)
Page 23
3-18
SCHEMATIC DIAGRAMS
Samsung Electronics
Repair Manual
+24V 1.8A
+5V 1.0A
GND
NO MARKING RESISTOR 1/4W-J (5%)
1
3
5
6
11
10
7
12
GND
CN5-14
CN5-13,15
CN5-16
EER2828
+5V +24VS
GND
GND
1
2
17
4
963181551612
7
14
8
13
1A
1B
2A
2B
PHASE1
+ENABLE1
RC1
SENSE1
E1
VREF
GND
E2
SENSE2
RC2
VCC
VBB
U1
A2918SWH
11 5
PHASE2
+ENABLE2
CN2
35303-0450
+5V
GNDGNDGNDGND
+24VS
+24V
CN4
35301-0350
GND
CN1
35303-0250
F501
250V 5A
R502
1/2W
560K
TNR501
TVR 10D 561K
C503
224
LF501
APOLLO12
D502
UF1010
C508
450V 150uF
V501
SCK-054
T501
NP
NB
N24
PC501
K1010H
PC501
K1010H
U503
KA431
2
3
1
L502
10uH
CN501
L
F.G
N
C505
104
C501
222MAD
C502
222MAD
C511
103
R517
82
1W
R509
3W
47K
R507
30
C509
50V 33uF
C510
2A 223K
R510
1W
0.6
D504
ER1002FCT
C520
50V 1000uF
C515
10V
1000uF
R511
4.3K
R512
330
R516
2.2K-F
R515
2.2K-F
C518
10V 470uF
-
+
BD501
FL406
C506
332MAD
C517
104
C519
104
R521
150
R520
47K
OP501
ITR8406-S
R519
500
5W
LF502
APOLLO12
CN502
1
2
U501
BTA12-600
PC502
KMOC3063
L501
300uH
C504
333
R501
1W 47
FUSIBLE
R503
1/4W
22
R508
1W 180
FUSIBLE
R513
1/2W
1.5K
R504
22K
R505
1W
100K
F502
250V 2A
C513
1uF
R518
22
R514
22
C522
1KV 102
C514
1KV 102
N5
D503
SB1040FCT
R506
1W
100K
U502
STRT-G6153
VCC
5
DRAIN
1
OCP2GND3FB
4
D501
ER102
B501
APOLLO12
C507
104
C512
1KV 221K
C521
50V 1000uF
C8
50V 47uF
C3
50V 47uF
C1
331
C2
331
C5
331
R11
56K
R10
1K
C7
103
R6
2W 0.37
R8
1K
R5
2W 0.37
C6
103
R15
56KC4331
R7
1.2K
R9
17.4K
R13
2.2K
R2
5.6K
Q3
1008-Y
D3
1N4003
R12
510
R1
5.6K
Q1
1008-Y
D2
1N4003
CN5-7,9,11
CN5-8,10,12
CN5-1,3,5
CN5-2,4,6
EXIT
+24VS2
FUSER_ON
EGMOT_PHA
EGMOT_PHB
+EGMOT_A1
+EGMOT_B1
1
2
3
4
FAN
1
2
3
CLUTCH
1
2
SMPS Circuit Diagram (220V)
Page 24
3-19
Samsung Electronics
SCHEMATIC DIAGRAMS
Repair Manual
3.5 Panel Circuit Diagram
Page 25
Page 26
Samsung Electronics Digital Printing
CS Group
Copyright (c) 2001. 10
This manual is made and
described centering around
circuit diagram
and circuit description needed
in the repair center
in the form of appendix.
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