1. Training (H/W) [ML-5510N/ ML-5510ND/ML-6510ND ML-5512ND/ML-6512ND
Product Development Group 2
Samsung IT Solutions Business
Jan

2. Contents Type of products circuit specs Block diagram
Connection diagram
Main specs organization
Troubleshooting
Note Q&A
Contents

3. Ⅰ. Type of Products Circuit Specs
ML-651x series
ML-551x series
Processor
SPGPv4 (700MHz)
SPGPv4 (700 MHz)
Memory
Std.
DDR2 SDRAM 256MB
Max
DDR2 SDRAM 768MB
Flash
32MB
Power Rating
220~240VAC, 5A, 50/60Hz
110~127VAC, 9.8A, 50/60Hz
Power Consumption
Sleep mode : 10Watts
Ready mode : 120Watts
Printing mode: 900Watts
Ready mode : 100Watts
Printing mode: 820Watts
PC Interfaces
USB
Hi-speed USB 2.0
Wired Network
Ethernet 10/100/1000 Base TX(internal)
Wireless Network
Optionable ( b,g,n)
User interface
4-Line LCD + Status LED
Print Speed
Simplex
Up to 62ppm in A4(65ppm in Letter)
Up to 52ppm in A4(55ppm in Letter)
Duplex
Up to 40ipm in A4(42ipm in Letter)
Up to 33ipm in A4(35ipm in Letter)

4. Ⅱ. BLOCK DIAGRAM
If Acrobat Reader is not installed in the user’s PC, View User’s Guide button will install the Acrobat Reader 5.0 and show the User’s Guide.
If user can not open User’s Guide through View User’s Guide button, install the Acrobat Reader from Adobe site manually or from the software CD (cd:\Acrobat_Reader\each language).

5. Ⅱ. BLOCK DIAGRAM
If Acrobat Reader is not installed in the user’s PC, View User’s Guide button will install the Acrobat Reader 5.0 and show the User’s Guide.
If user can not open User’s Guide through View User’s Guide button, install the Acrobat Reader from Adobe site manually or from the software CD (cd:\Acrobat_Reader\each language).

6. Ⅱ. BLOCK DIAGRAM
If Acrobat Reader is not installed in the user’s PC, View User’s Guide button will install the Acrobat Reader 5.0 and show the User’s Guide.
If user can not open User’s Guide through View User’s Guide button, install the Acrobat Reader from Adobe site manually or from the software CD (cd:\Acrobat_Reader\each language).

7. Ⅱ. BLOCK DIAGRAM
If Acrobat Reader is not installed in the user’s PC, View User’s Guide button will install the Acrobat Reader 5.0 and show the User’s Guide.
If user can not open User’s Guide through View User’s Guide button, install the Acrobat Reader from Adobe site manually or from the software CD (cd:\Acrobat_Reader\each language).

8. Ⅲ. CONNECTION DIAGRAM
If a user want to install the software for the local printer (LPT: or USB), select Typical Installation for a local printer.
If a user want to install the software for the network printer (TCP/IP or share printer), select Typical Installation for a network printer.

9. Ⅳ. The Major Parts of Circuits
OPE
Main PBA
Engine PBA
SMPS
HVPS
FDB
It is possible to install the device without connecting a device
Click “Next>” button
Click “No” button in the next message box
Welcome dialog opens
Installation proceeds
If the message box is still opening although a user connects the device to the PC, check the followings.
Check the connected cable
Check the device power
Verify that the device is correct
If the New Hardware Found dialog is opened, cancel it.

10. Ⅳ. Summarizing Major Component
PBA-MAIN
Code : JC A/B
Code : JC A 1 2 3 4 5 6 7 8 9 10 11 12 13 14
connection 1
OPE 9
SATA HDD Signal 2
USB Host(Front) 10
USB 3
Parallel Option DC supply jack 11
ENGINE-FFC 4
LSU 62 12
DDR2 SODIMM 5
LSU 52 13
N/W 6
Wireless LAN 14
ENGINE POWER
(SMPS) 7
USB Host(Rear) 8
SATA HDD Power
It is possible to install the device without connecting a device
Click “Next>” button
Click “No” button in the next message box
Welcome dialog opens
Installation proceeds
If the message box is still opening although a user connects the device to the PC, check the followings.
Check the connected cable
Check the device power
Verify that the device is correct
If the New Hardware Found dialog is opened, cancel it.

11. Ⅳ. Summarizing Major Component
PBA-MAIN(3710)
Code : JC A
connection 12 1 2 3 4 5 6 7 8 9 13 14 15 16 10 11 1
OPC / FUSER / EXIT MOTOR 2
JOINT PBA 3
STACKER 4
HVPS 5
FUSER 6
MAIN-FFC 7
COVER OPEN / TONER BLDC 8
FEED / REGI SENSOR, PTL / TSENSOR 9 MP 10
SMPS POWER 11
MAIN PBA POWER 12
FEED MOTOR, ELEV SW 13
SCF 14
MSOK 15
CST SENSOR , DPX MOTOR 16
FDB
It is possible to install the device without connecting a device
Click “Next>” button
Click “No” button in the next message box
Welcome dialog opens
Installation proceeds
If the message box is still opening although a user connects the device to the PC, check the followings.
Check the connected cable
Check the device power
Verify that the device is correct
If the New Hardware Found dialog is opened, cancel it.

12. Ⅳ. Summarizing Major Component
SMPS V1/V2
Code : JC B (110V)
JC B (220V) 1 2
connection 1
Fuser_AC Output 2
OUTPUT_5V&24V (to Engine PBA)

13. Ⅳ. Summarizing Major Component
HVPS
Code : JC A 2 1 3
connection 1
THV, MHV, DEV, SAW 2
FUSER BIAS 3
ENGINE Control Signal

14. Ⅳ. Summarizing Major Component
FDB
Code : JC A (110V)
JC A (220V)
connection 4 1 2 3 1
SMPS AC OUTPUT 2
AC INPUT 3
FUSER AC 4
ENGINE Control Signal

15. Ⅳ. Summarizing Major Component
OPE(LED) PBA
Code : JC A (3310D Only) 1
There are Two LEDs present.
In error mode, the Error LED glows by red color .
When machine is power up, the Online LED glows by green color,
and when machine is power off or Error is occured, the Online LED turns off.
connection 1
LCD Control Signal 2
OPE Control Signal(to Main) 3
LCD Backlight Power

16. Ⅴ. Repair Trouble & Solutions(1) Error Blurred image [Description ]
When the picture is out of focus generally or partially
[Parts of Defect]
1. Developing Machine Cartridge(DMC)
2. HVPS
3. Zener PBA’s assembling condition
[Check and Cause]
1. Developing roller is infected due to toner in DMC almost exhausted
2. Loosing contact of high-tension terminal and developing machine electrode in set due to toner, et cetera.
3. Loosing contact between Zener PBA GND and Frame GND.
[Solution]
1. Replace DMC
2. Cleaning the infected parts from toner, etc.
3. If you cannot solve the matters for above solutions, change HVPS.
4. Check the connected condition of Zener PBA, disconnected or shorted state of OPC GND Harness.

17. Ⅴ. Repair Trouble & Solutions(2) Error
Settle Machine Error ( Open, Low, Over Heat Error)
[Description ]
1. Display :“#U1-2320” ( Open_Heat Error )
“#U1-2330” ( Low_Heat Error )
“#U1-2340” ( Over_Heat Error )
[Parts of Defect]
1. Fuser
2. Fuser Controller Micom
3. Fuser Harness
[Check and Cause]
1. Check Thermostat is Open.
2. Check Thermistor in position.
3. Check Heat Lamp is working.
4. Check Heat Lamp’s resistance value.
5. Check reappearing same problem using Power on/off.
[Solution]
1. If Thermostat was disconnected, replace Settle Machine.
2. If Thermistor wasn’t in position, replace Settle Machine.
3. If Heat Lamp’s resistance value was incorrect, replace Heat Lamp.
4. If the same problem’s reappeared after several Power on/off, cover on and check open/short of FDB Harness in PBA.

18. Ⅴ. Repair Trouble & Solutions(3) Error LSU Error (LSU Motor Error)
[Description ]
1. Exceptional signal of nLSU_READY.
2. Display : “#U2-1113”
[Parts of Defect]
1. LSU
2. LSU Harness
3. Main Controller
[Check and Cause]
1. Check th Pmotor is stable.
2. Check the LSU_3.3V power is normally supplied.
3. Check the LSU Harness is normally assembled.
[Solution]
1. Check LSU Harness short/open.
2. Check LSU_3.3V power supply.
3. Replace LSU
4.If the same problem’s reappeared after replacing LSU, change Main controller.

19. Ⅴ. Repair Trouble & Solutions(4) Error Cover open [Description ]
1. Display : “Door open close it”
[Parts of Defect]
1. Front Cover ‘s hook, HVPS Switch , RearCover Switch
2. SMPS
[Check and Cause]
1.Check Hook lever of Front Cover is damaged or transformed.
2. Check HVPS Switch and Rear Cover Switch are transformed.
3. Check the main motor is working when you power on the product.
[Solution]
1. If the Hook lever is trouble, replace it.
2. If HVPS Switch is trouble, replace it.
3. IF Rearcover Switch is trouble, replace Outbin Full Sensor & Rear Cover (All - in - one Switch)

20. Ⅴ. Repair Trouble & Solutions(5) Error Poor power supply
[Description ]
When the product isn’t working after insertion power cable and push the power button.
[Parts of Defect]
1. SMPS
2. OPE Harness
3. Engine PBA
[Check and Cause]
1. Check input/output power of SMPS is normal.
2. Check LED lamp isn’t working when the product is normally warming up.
(If LED lamp wasn’t turned on, Check OPE Harness in Main PBA)
[Solution]
1. Replace power cable or SMPS
2. Replace Main Controller
3. Replace Engine Controller
3. Check Harness short/open on Main Controller

21. Ⅵ note Q&A 1. Check Power Supply. •Check the power is turned on.
•Check the power cable is connected with socket.
•Check the voltage of power socket.
2. Check Panel
• Is LED lamp working on OPE?
-->If LED lamp wasn’t turned on check power cable, SMPS and Main board
•Is LED lamp not working unusually?
-->Check Main PBA and Harness
3. Check Paper Process(Route)
• In case of the JAM?
-->Removing paper in route.
• Jam is repeated continuously in C route?
-->Removing paper to open the rearcover back of settle machine.
-->Detailed check the cause of JAM to disassemble the product.

22. Ⅷ note Q&A 4. Printing Information Page • Printing test page
-->If you own the error check cable and printer driver was installed.
5. Check the quality of printing
• Trouble with printing quality?
-->Refer to the blurred image
6. Check the consumables
• Check Test Pattern
--> Printing and check expected life of consumables.
If it is almost exhausted, replace it.