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Epson Photo750 manual TRANST1

Models: Photo750

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EPSON Stylus Photo 750

Revision A

	+42 VDC	+5 VDC			PSC Signal
	+42 VDC	+5 VDC		ZD53	from Main board
				+5VDC Line
	IC51			Over Voltage
	IC51			Limitation
	+5V Regulator			ZD52,87
				ZD52,87
			+42VDC Line
			Over Voltage		ZD90
			Limitation		ZD90
			Limitation		+42VDC Lin Drop
					+42VDC Lin Drop
	ZD81-86,ZD51				Limitation Circuit
	ZD81-86,ZD51
	+42VDC Line
	Constant Control			C84,Q84
	C51				Power Drop
	C51				Delay Circuit
		Smoothing			Delay Circuit
		Smoothing				PC1
		Circuit				PC1
	D51					Photo
						Coupler
		TRANS(T1)
	C11			Q1	Q2,Q3,Q31
	Smoothing			Main Switching		Abnormal
	Circuit			Circuit		Feed back circuit
	Over Current		Filter Circiut		Full Wave
	Protection		Filter Circiut		Rectifier circuit
	Protection				Rectifier circuit
	F1		L1,R1-2		DB1
			C1-C4
	AC Input
						op03

Figure 2-3. Power Supply Circuit Block Diagram

†+42V Line Constant Voltage Control Circuit:

The output level of the +42V line is monitored by a detection circuit consisting of seven Zener diodes.This circuit prevents from dropping for constant output voltage.

†+5V Line Over Voltage Protection Circuit:

This protection circuit is in the same line as +42V over voltage protection circuit is located. The output voltage level of the +5V line is monitored by a Zener diode. This circuit shuts down the circuit operation forcefully when the voltage level exceeds +9V.

†+42VDC Line Drop Limitation Circuit:

This protection circuit is in the same line as +42V over voltage protection circuit is located. The output voltage level of the +42V line is monitored by a Zener diode. This circuit shuts down the circuit operation forcefully when the voltage levels drops +36V.

†+42VDC Line Over Voltage Circuit:

This circuit is in the same line as +5V line over voltage protection circuit is installed. The output level is monitored by two Zener diodes. If the voltage level exceeds +48VDC, this circuit stops circuit operation forcefully.

†+5V Line Constant Voltage/Constant Current Control Circuit:

The output current is monitored by a +5VDC generation switching control IC(IC51), which also monitors the output voltage. This information is input to the internal comparator and stabilizes +5V line.

Operating Principles

Operating Principles of Electric Circuit

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Image 36

Epson Photo750 manual TRANST1

Contents

659,&#0$18$ General Notice Precautions About This Manual Revision Status Table of Contents Maintenance Product Description General Characteristics Overview„ Holds 10 transparency films Raster Graphics Mode General DescriptionPrinting Printing SpeedPaper Specification Paper Feeding„ No curled, wrinkled, scuffing or torn paper be used Printable Area Paper Left Right Top BottomWidth Length Margin Typ Min Adjust Lever Settings Setting Position of Adjust LeverPaper Lever position Adjustment Value EnvelopeEnvironmental Conditions Environmental ConditionInk Cartridge Black Ink CartridgeColor Ink Cartridge Electric Specification Safety ApprovalsInput Data Buffer ReliabilityCE Marking Printer Language and Emulation14.1 ESC/P Control Codes „ Dot size control ESC e „ Raster header ESC D „ Raster body Connector pin assignment and signals Parallel InterfaceParallel InterfaceForward channel Parallel I/FPin Signal Return In/Out Function Description Name GND pin Parallel InterfaceReverse channelConnect pin assignment and signals Xflag OutParallel I/F Mode Typical time of tack 10. Typical Time of Tack12. Connector pin assignment and signals Serial Interface11. Serial interface 13. X-ON/X-OFF, DTR protocol14. Connector pin assignment and signals Pin Signal Name Out Function DescriptionUSBUniversal Serial Bus Interface Prevention of data transfer time-out on Host Interface selectionIeee 1284.4 protocol Bi-directional Command SwitchesFunction Control CodeSpecial Setting Mode 18. Special setting modeLED Indications 17. Status printingErrors Indicators19. Printer Status displayed on the control panel Ink Out Paper Out Priority Black Color„ When you need to perform test print after the repair InitializationInitialization Setting Physical SpecificationConsumables and options 20. ConsumablesClassification Name Operating Principles Printer Mechanism Printer MechanismEpson Stylus Photo Revision a 1 C257 PSB Power Supply Circuit Operating Principles of Electric CircuitOutput Voltage Voltage UsageTRANST1 2 C259 Main Control Circuit Major ElementsMajor Elements Location FunctionReset Circuit Reset CircuitSensor Circuit Sensor CircuitTimer Circuit Eeprom Control CircuitHead Drive Circuit Paper Feed Pump Motor PF/Pump Motor Drive Circuit Paper Feed Pump Motor Drive CircuitCarriage MotorCR Motor Drive Circuit 10. Carriage Motor Drive CircuitTroubleshooting Check Point Signal Level Switch Mode Sensor Check PointMotor, Coil Resistance Motor Location Check Point ResistanceError Indication LED Indication Condition RemedyPaper Ink End Check Black Color Unit Level Troubleshooting Symptoms and Corresponding Flow ChartSymptom 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 Unit Repair Power Supply Board Repair of the Power Supply BoardSympto Condition Cause Check point Solution Repair of the Control Board Repair of the Control BoardEpson Stylus Photo Revision a Symptom Condition Cause Check Point Solution Unit Repair Printer Mechanism10. Repair of the Printer Mechanism 11. Repair of the Printer Mechanism12. Repair of the Printing Mechanism 13. Repair of the Printing Mechanism14. Repair of the Printer Mechanism 15. Repair of the Printer MechanismDisassembly and Assembly Precautions ToolsName Supplier Parts No Phillips Screw Driver Work Completion Check Check ListClassifi Check Point Status Cation Disassembly Flowchart below shows step-by step disassembly proceduresHousing Removal Housing RemovalCircuit Boards Removal Shield Plate, M/B RemovalE P O Control Panel Removal Control Panel RemovalAbsorber Tray, AssemblyA Removal Absorber Tray, AssemblyA RemovalPrinter Mechanism Removal Print Head RemovalE „ Be sure that the grounding plate is installed to Print Head InstallationPump, Assembly/Cap, Assembly Removal „ Be careful not to damage the rubber part of the cap11. Ink Tube Motor, Assembly, CR Removal Bi-D adjustment. See Bi-D Adjustment onMotor Assembly PF Removal 15. Motor, Assembly, PF Installation5.5 ASF, Assembly Removal Paper Feed Roller Assembly Removal E „ When removing or installing the HopperRoller Assembly, LD Left/Right Removal 18. Roller Assembly, LD RemovalCarriage Assembly Removal 19. Bush Parallel Adjust Removal20. Carriage Assembly Removal PE Sensor Assembly Removal 21. PE Sensor Assembly RemovalRoller, Assembly, PF Removal 23. Roller, Assembly, Paper Exit Removal24. Roller, Assembly, PF Removal HP Sensor Removal 25. HP Sensor RemovalCartridge SensorSensor, I/C Removal 26. Bush Holder, Sensor, I/C Removal29. Sensor, I/C Removal Adjustment Required Adjustment Required AdjustmentAdjustment Paper Gap Adjustment„ Do not scratch special coated surface of the PF Epson Stylus Photo Revision B Adjustment by Adjustment Program 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 Head Angular Adjustment Screw position for fixing the print headMagnetized condition when the printer has been left Adjustment, the following screen will be appearedU Preventing from the CR motor fall into the non Alone more then 5 minutes in the Head AngulerBi-D Adjustment Bi-D Adjustment Pattern SampleHead Cleaning Initial Ink Charge Protect Counter Reset Counter Value for Ink AbsorberProtect Counter Value Maintenance Cleaning Service Maintenance„ Never use chemical solvents, such as thinner, to Lubrication „ Never use oil and the grease other than thoseLubrication 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 Connector Summary for C259MainConnector CN4 Major Component UnitConnector CN5 Connector CN6Connector CN7 Connector CN8Connector CN10 10. Connector CN11Component Layout C259 Main Component LayoutAppendix Component Layout 101 Exploded Diagram Exploded Diagram-1Exploded Diagram for Epson Stylus Photo 750 2/3 Exploded Diagram for Epson Stylus Photo 750 3/3 Electric Circuit Page Page