service manual file1. precautions follow these safety, esd, and servicing precautions to prevent...

SERVICE

SAMSUNG PRINTERML-5000A/ML-5000G

Manual

LASER PRINTER CONTENTS

1. Precautions

2. Schematic Diagrams

©Samsung Electronics Co., Ltd. Jul. 1998Printed in KoreaP/N. JB68-60988A

ELECTRONICS

1. Precautions

Follow these safety, ESD, and servicing precautions to prevent personal injury and equipment damage.

1-1. Safety Precautions

1. Be sure that all built-in protective devices are inplace. Restore any missing protective shields.

2. Make sure there are no cabinet openings throughwhich people- particularly children- might insertfingers or objects and contact dangerous voltages.

3. When re-installing chassis and assemblies, besure to restore all protective devices, includingcontrol knobs and compartment covers.

4. Design Alteration Warning:Never alter or add to the mechanical or electricaldesign of this equipment, such as auxiliaryconnectors, etc. Such alterations andmodifications will void the manufacturerÕswarranty.

5. Components, parts, and wiring that appear tohave overheated or are otherwise damagedshould be replaced with parts which meet theoriginal specifications. Always determine thecause of damage or overheating, and correct anypotential hazards.

6. Observe the original lead dress, especially nearsharp edges, AC, and high voltage powersupplies. Always inspect for pinched, out-of-place, or frayed wiring. Do not change thespacing between components and the printedcircuit board.

7. Product Safety Notice:Some electrical and mechanical parts have specialsafety-related characteristics which might not beobvious from visual inspection. These safetyfeatures and the protection they provide could belost if a replacement component differs from theoriginal. This holds true, even though thereplacement may be rated for higher voltage,wattage, etc.

Components critical for safety are indicated inthe parts list with symbols . Use onlyreplacement components that have the sameratings, especially for flame resistance anddielectric specifications. A replacement part thatdoes not have the same safety characteristics asthe original may create shock, fire, or other safetyhazards.

Samsung Electronics 1-1

1-2 Samsung Electronics

Precautions

1-2. ESD Precautions

Certain semiconductor devices can be easilydamaged by static electricity. Such components arecommonly called ÒElectrostatically Sensitive (ES)DevicesÓ, or ESDs. Examples of typical ESDs are:integrated circuits, some field effect transistors, andsemiconductor ÒchipÓ components.The techniques outlined below should be followedto help reduce the incidence of component damagecaused by static electricity.

CAUTION: Be sure no power is applied to thechassis or circuit, and observe all other safetyprecautions.

1. Immediately before handling a semiconductorcomponent or semiconductor-equipped assembly,drain off any electrostatic charge on your bodyby touching a known earth ground. Alternatively,employ a commercially available wrist strapdevice, which should be removed for your personalsafety reasons prior to applying power to the unitunder test.

2. After removing an electrical assembly equippedwith ESDs, place the assembly on a conductivesurface, such as aluminum or copper foil, orconductive foam, to prevent electrostatic chargebuildup in the vicinity of the assembly.

3. Use only a grounded tip soldering iron to solderor desolder ESDs.

4. Use only an Òanti-staticÓ solder removal device.Some solder removal devices not classified asÒanti-staticÓ can generate electrical chargessufficient to damage ESDs.

5. Do not use Freon-propelled chemicals. Whensprayed, these can generate electrical chargessufficient to damage ESDs.

6. Do not remove a replacement ESD from itsprotective packaging until immediately beforeinstalling it. Most replacement ESDs arepackaged with all leads shorted together byconductive foam, aluminum foil, or a comparableconductive material.

7. Immediately before removing the protectiveshorting material from the leads of a replacementESD, touch the protective material to the chassisor circuit assembly into which the device will beinstalled.

8. Maintain continuous electrical contact betweenthe ESD and the assembly into which it will beinstalled, until completely plugged or solderedinto the circuit.

9. Minimize bodily motions when handlingunpackaged replacement ESDs. Normal motions,such as the brushing together of clothing fabricand lifting oneÕs foot from a carpeted floor, cangenerate static electricity sufficient to damage anESD.

1-3. Lithium Battery Precautions

1. Exercise caution when replacing a Lithiumbattery. There could be a danger of explosion andsubsequent operator injury and/or equipmentdamage if incorrectly installed.

2. Be sure to replace the battery with the same orequivalent type recommended by themanufacturer.

3. Lithium batteries contain toxic substances andshould not be opened, crushed, or burned fordisposal.

7. Schematic Diagrams

7-1 Controller (ML-5000A) 1/7Controller (ML-5000A) 2/7Controller (ML-5000A) 3/7Controller (ML-5000A) 4/7Controller (ML-5000A) 5/7Controller (ML-5000A) 6/7Controller (ML-5000A) 7/7

7-2 Controller (ML-5000G) 1/2Controller (ML-5000G) 2/2

7-3 OPE Panel (ML-5000A/G)

7-4 Engine (ML-5000A/G) 1/3Engine (ML-5000A/G) 2/3Engine (ML-5000A/G) 3/3

7-5 Joint Board (ML-5000A/G)

7-6 HVPS (ML-5000A/G) 1/3HVPS (ML-5000A/G) 2/3HVPS (ML-5000A/G) 3/3

7-7 Sensor (ML-5000A/G)

7-8 Switch (ML-5000A/G)

7-9 PTL (ML-5000A/G)

7-1Samsung Electronics

Controller (ML-5000A) 1/7


Schematic Diagrams



Schematic Diagrams

Controller (ML-5000G) 1/2

1 2

N.A

3 4 5 6 7 8

1 2 3

002 - 010005AF

4

D

C

*RESERVED

B

N.A

E

F

A

B

C

A

D

1/2

E

E D

REF NO SEC

Samsung Electronics Co., Ltd.

All Rights reserved.

A3-75 PFP (297 X 420)

N.A


Schematic Diagrams

Controller (ML-5000G) 2/2

B

C

D

E

F

A

B

C

D

E

E D

REF NO 2/2SEC

Samsung Electronics Co., Ltd.

All Rights reserved.

A3-75 PFP (297 X 420)002 - 010005AF

1 2 3 4 5 6 7 8

1 2 3 4

A


Schematic Diagrams

OPE Panel (ML-5000A/G)


Schematic Diagrams

Engine (ML-5000A/G) 1/3


Schematic Diagrams



Schematic Diagrams

Joint Board (ML-5000A/G)


Schematic Diagrams

HVPS (ML-5000A/G) 1/3

-

+KA324

ZD403

100V

T401

R425

4M,1/2W

R415

4M,1/2W

R423

4M,1/2W

ZD405

100V

ZD404

51V

R407

100K

C402

104J

C406

470PF

R420

4M,1/2W

Q402

KSD526Y

R417

2M,1/2W

C404

3K

R422

4M,1/2W

D402

4KV

24VS

C405

68pF

OUTIN

GND

U3

D401

4KV

R411

4M,1/2W

R419

4.7M,1/2W

C3

35V

ZD401

100V

ZD402

100V

R409

430

R110

2.2K

R112

2K

Q105

A1379

R107

33K

R106

10K

R109

10K

Q104

C3198

R108

3.3K

R111

33K,1/4W

C106

1KV/100PF

C107

1K/100PF

R118

33K,1/4W

R115

3.3K

Q106

C3198

R117

10K

R113

10KR114

33K

Q107

A1379

R119

2K

R116

2.2K

R410

10

C108

1K/100pF

R426

1/2W

100K

MHV-EA

DEV-EA-A

SUPPLY-EA

SUPPLY

R424

4M,1/2W

C403

50V

R408

47K

R413

4M,1/2W

R418

4.7M,1/2W

+18V24VS

C2

50V

C1

50V

R132

33K,1/4W

R128

3.3K

Q110

C3198

R131

10K

R126

10KR127

33K

Q109

A708-Y

R129

2K

R130

2.2K

18V

24VS

DEV-EA-B

R405

93.1K

C401

50V

R403

200K

R406

16.2K

R401

33K

ZD406

100V

R402

33K

ZD409

100V

ZD408

100V

ZD407

100V

24VS

MHV

DEV

Q401

KSC1008

VR401

20K

MF

1/6W

#4

#9

#5

#1.2

Date : 1998.06.29

Document Number : 9717-08B Rev 1.4

Sheet 1 of 3

Drawing No.

Design ApprovalCheckDrawing

Title : High Voltage Power Supply

8

9

1/8W

1/8W,MF

1/8W

9717-08B

MF

MF

7

4

2

5

1

U1

4

104J 104J 47uF

3K

470pF

2KV

1/6W

1/6W

1/6W

1/2W333Z

1/6W50V

1/6W

333Z

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W1/6W

1/6W

1/6W

1/6W

1/6W

1/6W1/6W

1/6W 1/6W

1/6W1/6W

MF

MF

MF

MF

MF

MF

MF

MF

MF

MF

MF

#3

14

12

13


Schematic Diagrams

HVPS (ML-5000A/G) 2/3

THV-PWM

VR302

202

THV

C205

2KV

D205

4KV

D204

4KV

-

+

U1

KA324

C204

50V

R215

390

R214

2.2K

T201

R216

BR

C206

3KV/470PF

C207

3KV

ZD202

7.5V

ZD201

5.6V

D203

1N4148

R213

2.2K

R210

1/8W

R211

1/8W

R212

680K

C203

50V

D-GND

Q204

D526

R315

BR,30M

R209

100K

VR201

503

R207

1K

R208

30K

D202

1N4148

C202

50V

C201

50V

Q201

C1008-Y

Q202

C1008-Y

Q203

A708-Y

D201

1N4148

R203

100

R204

100

R206

100

18V

5VR202

1.8K

18V

C304

500V

5V

R201

10K

R205

1.8K

VR301

502

5V

A-GND

R307

33K

R310

2.2K

R308

33K

24VS

Q302

A708-Y

Q301

A708-Y

Q303

D526

18V

R304

389K

R313

MOF1W,56

R312

MOF1W,56

R306

26.1K

R309

2.2K

C303

50V

R305

10K

R303

100K

R302

33K

C308

3KV

C307

3KV/470PF

THV-EA

T301

-

+

C302

50V

R311

100K

C301

50V

R314

2.2K

C305

50V/333Z

D302

1N4148

D303

4KV

D304

4KV

C306

2KV

R301

470K

D301

1N4148

24VS

R217

BR

24VS

C101

35V/47uF

C4

50V

C5

50V/103J

THV-READ

18V

R3

1/2W

560

ZD1

BSB

5.6V

C7

104J

50V

R218

2M

9

8

6

5

7

10

#21,22,23

#13

#24

#15

#19

#11

65

4321

Date : 1998.06.29

Rev 1.4Document Number : 9717-08B

Sheet 2 of 3

Drawing No.



5

4

6

7

4

2

1

4

7

6

4

2

5

1

MF

MF

1/8W

1/8W 1/8W

103Z

1/8W

MF

BSB

9717-08B

470PF

470PF

MFMF

800K

1/6W

1/6W

1/6W

1/6W

1/6W

MFMF

1/6W 1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W

1/6W1/6W

1/6W

1/6W

U1

103J

102J

222J

103J

68pF

200M

30M

68pF

333Z

472J BM

103J

121 1M


Schematic Diagrams

HVPS (ML-5000A/G) 3/3

24VS

D1

1N4003

5VS

R1

1/2W,0.5

L1

1.2uH

24V 24VS

A-GND

5V

THV-READ

24VS

SUPPLY-EA

C6

1NF/50V

MHV-EA

D-GND

DEV-EA-B

THV-EA

DEV-EA-A

D-GND

THV-PWN

24VS

R2

1/2W,0.5

5VS

NC

123

CN2

Date : 1998.06.29

Rev 1.4Document Number : 9717-08B

Sheet 3 of 3

Drawing No.



9717-08B

4

CN3

CN4

CN1

1

2

5

4

3

1

2

3

4

5

6

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

3

2

1


Schematic Diagrams

7-7 Sensor (ML-5000A/G)


Schematic Diagrams

7-8 Switch (ML-5000A/G)


Schematic Diagrams

7-9 PTL (ML-5000A/G)


Schematic Diagrams

service manual file1. precautions follow these safety, esd, and servicing precautions to prevent...

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