Epson Photo750 manual Unit Repair Power Supply Board, Repair of the Power Supply Board

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EPSON Stylus Photo 750

Revision A

3.3 Unit Repair (Power Supply Board)

This section describes the problems related to the power supply board. The table below provides various symptoms, likely causes, and checkpoints. The checkpoints refer to waveforms, resistance, and other values to check to evaluate the operation of each component.

Table 3-5. Repair of the Power Supply Board

	Sympto	Condition	Cause	Check point	Solution
	m	Condition	Cause	Check point	Solution
	m

Table 3-6. Repair of the Power Supply Board

	Sympto	Condition	Cause	Check point	Solution
	m	Condition	Cause	Check point	Solution
	m

The
printer	+42VDC
does not	line does
operate at	not work.
all.

	F1 is open.	Check F1 is normal or not by using	Replace
	F1 is open.	a multimeter.	F1.
		a multimeter.	F1.

	Trans T1 is	Check T1 is normal or not by using	Replace
	open.	a multimeter.	T1.

		Check the drain wave.

FET(Q1) is	Replace
broken.	Q1.

	Check the collector wave.
Q2 or Q3 is				Replace
				Replace
				Q2 or
broken.				Q2 or
broken.				Q3.
				Q3.

The printer does not operate at all.

+5VDC line does not work.

IC51(FA36 35A) is broken.

Check the output wave(pin 8).

Replace IC51.

PC1 is broken.

Replace PC1.

Troubleshooting

Unit Repair (Power Supply Board)

44

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Contents 659,&#0$18$ General Notice Precautions About This Manual Revision Status Table of Contents Maintenance Product Description Overview General Characteristics„ Holds 10 transparency films General Description Raster Graphics ModePrinting Printing SpeedPaper Feeding Paper Specification„ No curled, wrinkled, scuffing or torn paper be used Paper Left Right Top Bottom Printable AreaWidth Length Margin Typ Min Setting Position of Adjust Lever Adjust Lever SettingsPaper Lever position Adjustment Value EnvelopeEnvironmental Condition Environmental ConditionsBlack Ink Cartridge Ink CartridgeColor Ink Cartridge Safety Approvals Electric SpecificationInput Data Buffer ReliabilityPrinter Language and Emulation CE Marking14.1 ESC/P Control Codes „ Dot size control ESC e „ Raster header ESC D „ Raster body Parallel Interface Connector pin assignment and signalsParallel InterfaceForward channel Parallel I/FParallel InterfaceReverse channel Pin Signal Return In/Out Function Description Name GND pinXflag Out Connect pin assignment and signals10. Typical Time of Tack Parallel I/F Mode Typical time of tackSerial Interface 12. Connector pin assignment and signals11. Serial interface 13. X-ON/X-OFF, DTR protocolPin Signal Name Out Function Description 14. Connector pin assignment and signalsUSBUniversal Serial Bus Interface Interface selection Prevention of data transfer time-out on HostIeee 1284.4 protocol Switches Bi-directional CommandFunction Control Code18. Special setting mode Special Setting ModeLED Indications 17. Status printingIndicators Errors19. Printer Status displayed on the control panel Ink Out Paper Out Priority Black ColorInitialization „ When you need to perform test print after the repairPhysical Specification Initialization Setting20. Consumables Consumables and optionsClassification Name Operating Principles Printer Mechanism Printer MechanismEpson Stylus Photo Revision a Operating Principles of Electric Circuit 1 C257 PSB Power Supply CircuitOutput Voltage Voltage UsageTRANST1 Major Elements 2 C259 Main Control CircuitMajor Elements Location FunctionReset Circuit Reset CircuitSensor Circuit Sensor CircuitEeprom Control Circuit Timer CircuitHead Drive Circuit Paper Feed Pump Motor Drive Circuit Paper Feed Pump Motor PF/Pump Motor Drive Circuit10. Carriage Motor Drive Circuit Carriage MotorCR Motor Drive CircuitTroubleshooting Sensor Check Point Check Point Signal Level Switch ModeMotor, Coil Resistance Motor Location Check Point ResistanceLED Indication Condition Remedy Error IndicationPaper Ink End Check Black Color Symptoms and Corresponding Flow Chart Unit Level TroubleshootingSymptom Cause Flow Chart E c k t h e Error S s a g e . R e f e r t o T a b le 3 A R T Repair of the Power Supply Board Unit Repair Power Supply BoardSympto Condition Cause Check point Solution Repair of the Control Board Repair of the Control BoardEpson Stylus Photo Revision a Unit Repair Printer Mechanism Symptom Condition Cause Check Point Solution10. Repair of the Printer Mechanism 11. Repair of the Printer Mechanism13. Repair of the Printing Mechanism 12. Repair of the Printing Mechanism15. Repair of the Printer Mechanism 14. Repair of the Printer MechanismDisassembly and Assembly Tools PrecautionsName Supplier Parts No Phillips Screw Driver Check List Work Completion CheckClassifi Check Point Status Cation Flowchart below shows step-by step disassembly procedures DisassemblyHousing Removal Housing RemovalShield Plate, M/B Removal Circuit Boards RemovalE P O Control Panel Removal Control Panel RemovalAbsorber Tray, AssemblyA Removal Absorber Tray, AssemblyA RemovalPrint Head Removal Printer Mechanism RemovalPrint Head Installation E „ Be sure that the grounding plate is installed to„ Be careful not to damage the rubber part of the cap Pump, Assembly/Cap, Assembly Removal11. Ink Tube Bi-D adjustment. See Bi-D Adjustment on Motor, Assembly, CR Removal15. Motor, Assembly, PF Installation Motor Assembly PF Removal5.5 ASF, Assembly Removal E „ When removing or installing the Hopper Paper Feed Roller Assembly Removal18. Roller Assembly, LD Removal Roller Assembly, LD Left/Right Removal19. Bush Parallel Adjust Removal Carriage Assembly Removal20. Carriage Assembly Removal 21. PE Sensor Assembly Removal PE Sensor Assembly Removal23. Roller, Assembly, Paper Exit Removal Roller, Assembly, PF Removal24. Roller, Assembly, PF Removal 25. HP Sensor Removal HP Sensor Removal26. Bush Holder, Sensor, I/C Removal Cartridge SensorSensor, I/C Removal29. Sensor, I/C Removal Adjustment Required Adjustment Required AdjustmentPaper Gap Adjustment Adjustment„ Do not scratch special coated surface of the PF Epson Stylus Photo Revision B Adjustment Program Adjustment by Adjustment ProgramHow to use the Adjustment Program „ You have to go through the menu to inputOptions in the Program and Keys to Use Setting Destination Information Head Voltage ID Adjustment Screw position for fixing the print head Head Angular AdjustmentAdjustment, the following screen will be appeared Magnetized condition when the printer has been leftU Preventing from the CR motor fall into the non Alone more then 5 minutes in the Head AngulerBi-D Adjustment Pattern Sample Bi-D AdjustmentHead Cleaning Initial Ink Charge Counter Value for Ink Absorber Protect Counter ResetProtect Counter Value Maintenance Service Maintenance Cleaning„ Never use chemical solvents, such as thinner, to „ Never use oil and the grease other than those LubricationLubrication Point Type Name Epson Code SupplierASF A R , 2 3 V e r a p p l y t h e o i l Appendix Connector Summary for C259Main Connector SummaryConnector CN4 Major Component UnitConnector CN6 Connector CN5Connector CN7 Connector CN810. Connector CN11 Connector CN10C259 Main Component Layout Component LayoutAppendix Component Layout 101 Exploded Diagram-1 Exploded DiagramExploded Diagram for Epson Stylus Photo 750 2/3 Exploded Diagram for Epson Stylus Photo 750 3/3 Electric Circuit Page Page