Equipment information:

Samsung ML-4550 Printer
Manufacturer:
Samsung
Model: ML-4550
Date: 2006
Category: Computer equipment
Group: Printer
Description: DIGITAL LASER PRINTER
Information:
                                    Series Model: ML-4550 / 4551N / 4551ND
- High speed Laser Printer:
Up to 43 ppm in A4 (45 ppm in Letter),
Duplex: 29 ipm (A4); 30 ipm (Letter)
- Resolution: Up to 1200 x 1200 dpi
- Marvell 500Mhz
- Memory: 128 MB (Max. 512 MB)
128, or 256 MB optional memory available.
Use only the Samsung-approved DIMM.
128 MB: ML-MEM150, 256 MB: ML-MEM160
- Option:
ML-4550:500-sheet trays, ethernet 10/100 Base
TX wired LAN, ethernet 10/100 Base
hard disk, duplex unit, DIMM
- Toner cartridge:
Starter: 10K or 20K pages
Consumable: 10K or 20K pages
- Duty cycle: Monthly Up to 150,000 pages

These manuals are available for the above equipment:

Samsung -- ML-4550 -- Service Manual
File name: Samsung-7271-Manual-Page-1-Picture
Manual Type: Service Manual
Pages: 185
Size: 12.09 Mbytes (12675975 Bytes)
Language: english
Revision: 1.0
Manual-ID/Number: JC-0168R
Date: March 2006
Quality: Electronic document, no scan, very well readable.
Upload date:
MD5: 45e39ae49d84c8a0318180ad9cca3fd8
ed2kID: 7a4760e4617836ad1af83952960c0732
Downloads: 11262 since 04 October 2015
Information:
1. Precautions
1.1 Safety Warning 1-1
1.2 Caution for safety 1-2
1.2.1 Toxic material 1-2
1.2.2 Electric Shock and Fire Safety Precautions 1-2
1.2.3 Handling Precautions 1-3
1.2.4 Assembly / Disassembly Precautions 1-3
1.2.5 Disregarding this warning may cause bodily injury 1-4
1.3 ESD Precautions 1-5
2. Product Specifications
2.1 Product Overview 2-1
2.2 Specifications 2-1
2.2.1 General Specifications 2-1
2.2.2 Controller & S/W 2-2
2.2.3 Paper Handling 2-3
2.2.4 Consumables 2-4
2.2.5 Reliability & Service 2-4
2.2.6 Environment 2-4
2.2.7 Options 2-5
2.2.8 Others 2-5
2.3 Model Comparison Table 2-6
3. Summary of Product
3.1 Printer Components 3-1
3.1.1 Front View 3-1
3.1.2 Rear View 3-2
3.1.3 Control Panel 3-3
3.2 System Layout 3-7
3.2.1 Feeding 3-8
3.2.2 Transfer 3-9
3.2.3 Driver Ass'y 3-9
3.2.4 Fuser 3-9
3.2.5 LSU (Laser Scanner Unit) 3-9
3.2.6 Print Cartridge 3-10
3.3 Engine H/W Specifications 3-11
3.3.1 ML-4550 (PCL) Main Board 3-11
3.3.2 SMPS & HVPS board 3-16
3.3.3 Engine F/W 3-20
4. Alignment and Adjustments
4.1 How to use EDC (Engine Diagnostic Control) Mode 4-1
4.1.1 EDC Setup 4-1
4.1.2 Entrance method for EDC 4-1
4.1.3 Cover Status 4-2
4.1.4 Sensor Status 4-3
4.1.5 Motor Test 4-5
4.1.6 Fan Test 4-5
4.1.7 Clutch / Sol 4-6
4.1.8 Fuser Ctrl 4-7
4.1.9 LSU 4-7
4.1.10 Deve Control 4-8
4.1.11 Print Test and Option version 4-9
4.2 Paper Path 4-10
4.2.1 Clearing Paper Jams 4-12
4.3 Sample Pattern 4-17
4.3.1 Information Pages 4-17
4.3.2 Demo Pages 4-17
4.4 Periodic Defective Image 4-18
4.5 Error Messages 4-19
5. Disassembly and Reassembly
5.1 General Precautions on Disassembly 5-1
5.2 Transfer Roller 5-2
5.3 MPF Ass’y 5-3
5.4 Holder Pad Ass'y 5-4
5.5 Retard Ass'y 5-5
5.6 Feed2 Idle Unit 5-6
5.7 Cover Right 5-7
5.8 Main PBA 5-8
5.9 Main Drive Ass'y 5-9
5.10 DEVE Drive Ass'y 5-10
5.11 Connector PBA 5-11
5.12 Solenoid 5-12
5.13 Rear Cover 5-13
5.14 Cover Left 5-14
5.15 Top Cover 5-15
5.16 Open Cover 5-16
5.17 Inner Cover 5-17
5.18 Fuser Ass'y 5-18
5.19 Duplex Solenoid Ass'y 5-20
5.20 Exit Roller 5-21
5.21 LSU 5-22
5.22 DC Fan 5-23
5.23 Toner Sensor PBA 5-24
5.24 REGI Ass'y 5-25
5.25 MP Pick Up Ass'y 5-26
5.26 Pick Up & Feed2 Assy 5-28
5.27 Engine Shield 5-31
6. Troubleshooting
6.1 The cause and solution of Bad image 6-1
6.2 The cause and solution of the bad discharge 6-8
6.3 The cause and solution of the malfunction 6-13
6.4 Maintaining the toner cartridge 6-17
6.5 The cause and solutions of bad environment of the
software 6-22
7. Exploded Views & Parts List
7.1 Main Assembly 7-2
7.2 Cover Assembly 7-5
7.3 Frame Assembly 7-7
7.4 Fuser Unit 7-12
7.5 REGI Assembly 7-14
7.6 Main Motor Assembly 7-16
7.7 Deve Motor Assembly 7-18
7.8 Exit Sorenoid Assembly 7-20
7.9 Cassette Assembly 7-22
7.10 Duplex Unit 7-24
7.11 SCF Unit 7-26
8. Block diagram
8.1 System Block Diagram 8-1
9. Connection Diagram
9.1 Connection Diagram 9-1
10. Schematic Diagram
10.1 Main Board 10-1
10.2 DIMM board 10-17
10.3 CRUM board 10-19
10.4 EMPTY board 10-20
10.5 HVPS 10-21
10.6 Panel 10-25
10.7 SCF 10-26
10.8 Toner sensor 10-29
10.9 HDD.eps 10-30
11. Reference Information
11.1 Troubleshooting Tools 11-1
11.2 Acronyms and Abbreviations 11-2
11.3 Select a location for the printer 11-4
11.4 Sample Tests Patterns 11-5
Samsung-7271-Manual-Page-1-Picture
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