Samsung SCX-4725FN User manual

Manual
SERVICE
DIGITAL LASER MFP
SCX-4725FN Series
SCX-4725FN/XAZ
Basic Model :SCX-4725FN
DIGITAL LASER MFP The keynote of Product
- Machine Life: 50,000Pages
- Cpu: Chorus M
- Device Memory: 32MB
- Resolution: 1200x1200dpi
- Option: N/A
- Printing Speed: 24ppm(A4, LTR)
- Print Language: PCL
- Path Type: C-Path
- Cassette Capa.: 250sheets
- Outlet Stacking Capa.: 100sheets
- Toner Cartridge: initial(1.5K), sales(3K)
- ADF Capacity: 30sheets
- Scan Method: 600 dpi Color CIS
- Copy Speed: SDMC: 22Cpm/Ltr,
MDMC: 7Cpm/Ltr
- Interface: USB2.0
SCX-4725FN Series

Contents
1. Precautions
1.1 Safety Warning 1-1
1.2 Caution for safety 1-2
1.3 ESD Precautions 1-5
1.4 Super Capacitor or Lithium Battery Precautions 1-5
2. Product Specification
2.1 Product Overview 2-1
2.2 Specifications 2-2
2.3 Model Comparison Table 2-8
3. System Overview
3.1 System Layout 3-1
3.2 Engine H/W Specification 3-5
3.3 Deverope Process 3-12
3.4 Sanner Part 3-13
3.5 OPE(Operational Panel Equipment) 3-15
3.6 SMPS & HVPS 3-16
3.7 FUSER AC POWER CONTROL 3-18
4. Alignment and Adjustments
4.1 User Mode 4-1
4.2 Tech Mode and Setting 4-4
4.3 Control Panel 4-13
4.4 LCD Status Error Massages 4-15
4.5 Engine Test Mode 4-17
4.6 Paper Path and Clearing Paper Jams 4-19

Continued
5. Disassembly and Reassembly
5.1 General Precautions on Disassembly 5-1
5.2 MP Tray 5-2
5.3 Pick Up Roller 5-3
5.4 Front Cover 5-3
5.5 Cassette Tray 5-4
5.6 Rear Cover 5-5
5.7 Right Cover 5-6
5.8 Left Cover 5-7
5.9 Scan Ass'y 5-8
5.10 ADF Housing 5-9
5.11 OPE Unit 5-11
5.12 Platen Housing 5-12
5.13 Middle Cover 5-14
5.14 HVPS 5-15
5.15 Main PBA 5-16
5.16 RX Drive 5-17
5.17 Fuser Unit 5-18
5.18 Engine Shield (With LIU PBA, SMPS) 5-21
5.19 LSU 5-22
5.20 Paper Path Frame 5-23
5.21 CRUM Harness 5-25
6. Troubleshooting
6.1 Checking Symptoms 6-1
6.2 Bad discharge 6-4
6.3 Set Malfunction – Causes and Solutions 6-8
6.4 Bad Software Environment 6-12
6.5 Bad image 6-16
6.6 Fax & Phone Problems 6-23

Continued
6.7 Copy Problems 6-27
6.8 Scanning Problems – Causes and Solutions 6-29
6.9 Toner Cartridge Service 6-30
6.10 Software Problems – Causes and Solutions 6-32
6.11 Windows Problems 6-36
6.12 SyncThru Installation Problems 6-37
7. Exploded Views & Parts List
7.1 Main 7-2
7.2 Cover Housing 7-3
7.3 Front Cover 7-4
7.4 Rear Cover 7-5
7.5 Frame Ass'y 7-6
7.6 ADF Ass'y 7-7
7.7 Platen Cover Ass'y 7-8
7.8 Platen Ass'y 7-9
7.9 OPE Unit 7-10
7.10 RX Drive Unit 7-11
7.11 MP Tray 7-12
7.12 Fuser Unit 7-13
7.13 Paper Path Ass'y 7-14
7.14 Pick Up Unit 7-15
8. Block diagram
8.1 System Block Diagram 8-1

Continued
9. Connection Diagram
9.1 Connection Diagram 9-1
10. Reference Information
10.1 Troubleshooting Tools 10-1
10.2 Acronyms and Abbreviations 10-2
10.3 Selecting printer locations 10-4
10.4 Sample Tests Patterns 10-5
11. Circuit Description
11.1 Engine Controller 11-1
11.2 System Overview 11-7

Samsung Electronics
Service Manual
Troubleshooting
6-2
6.1.1 Basic Check List
1. Check the Power.
• Does "Warming Up" appear on the display?
--> If not check power cable, switch or SMPS.
--> Does the wall socket work?
• Do the Motors or other components initialize (listen for main motor, fan and LSU sounds)?
--> If not or there are none of the normal startup sounds check cable, switch or SMPS.
--> Does the wall socket work?
2. Check the LCD Panel.
• Is there any display at all?
--> If not check power cable, switch or SMPS.
--> Does the wall socket work?
• Is the display a meaningful message care there any broken or badly formed characters?
--> Check the main PBA and cable harness.
• Is the message on the LCD Panel a standard error message?
--> Refer to section 4.3
3. Check the Paper Path
• Is there a Paper Jam?
--> Remove any paper fragments caught in the paper path.
• Paper Jam occurs repeatedly at a specific point in the Paper Path
--> Open the fuser cover, Jam clear.
--> Dismantle the machine and carefully inspect the region where the jam occurs.
(Especially, check if paper fragments are caught in the Fuser
4. Print the Information Page (Configuration).
• Try printing a test page from a computer.
--> If there is an error check cables and driver installation.
5. Check the Print Quality.
•Is there are a Print Quality Problem?
--> Refer to section 6.5
6. Check consumables (toner etc.).
•Using the keys print the Test Pattern.
--> Expected life of various consumable parts, compare this with the figures printed and replace as required

Exploded Views & Parts List
Samsung Electronics Service Manual
7-1
7
7
7.1 Main 7-2
7.2 Cover Housing 7-3
7.3 Front Cover 7-4
7.4 Rear Cover 7-5
7.5 Frame Ass'y 7-6
7.6 ADF Ass'y 7-7
7.7 Platen Cover Ass'y 7-8
7.8 Platen Ass'y 7-9
7.9 OPE Unit 7-10
7.10 RX Drive Unit 7-11
7.11 MP Tray 7-12
7.12 Fuser Unit 7-13
7.13 Paper Path Ass'y 7-14
7.14 Pick Up Unit 7-15
7. Exploded Views and Parts List
Contents

SAMSUNG Laser SCX-4725 sm_06.pdf
SAMSUNG Laser SCX-4725 sm_06.pdf
SAMSUNG Laser SCX-4725 sm_06.pdf
SAMSUNG Laser SCX-4725 sm_06.pdf
SAMSUNG Laser SCX-4725 sm_06.pdf
SAMSUNG Laser SCX-4725 sm_06.pdf
SAMSUNG Laser SCX-4725 sm_06.pdf
SAMSUNG Laser SCX-4725 sm_06.pdf
SAMSUNG Laser SCX-4725 sm_06.pdf