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Epson Photo750 manual Reset Circuit

Models: Photo750

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EPSON Stylus Photo 750

Revision A

2.2.2.2 Reset Circuit

Reset circuit consists of reset/timer IC(IC8) and peripheral elements. The reset/timer IC prevents the CPU from running away, which is caused by the unstable voltage(+5VDC line voltage is less than +4.3V) in the logic line during the power ON/OFF operation. Also, IC sends the reset signal to the CPU and gate array when +42VDC line voltage is less than +35.5V.

			IC 1
			C90A05
				/RES
		IC 8		B1
		RTC-9810		10
	+42	VIN	/VDT	10	29	/NMI
	+42	VIN	/VDT		29	/NMI
		VDD	FRST	3	24	MRES
		VDD	FRST		24	MRES
			/RST	2	25	/RESET
			/RST		25	/RESET
		VBK	CE
		GND	SCLK			IC 2
		GND	SCLK			E05B588
						E05B588
			DATA

Figure 2-5. Reset Circuit

Operating Principles

Operating Principles of Electric Circuit

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Epson Photo750 manual Reset Circuit

Contents

659,&#0$18$ General Notice Precautions About This Manual Revision Status Table of Contents Maintenance Product Description „ Holds 10 transparency films General CharacteristicsOverview Printing Raster Graphics ModeGeneral Description Printing Speed„ No curled, wrinkled, scuffing or torn paper be used Paper SpecificationPaper Feeding Width Length Margin Typ Min Printable AreaPaper Left Right Top Bottom Paper Lever position Adjustment Value Adjust Lever SettingsSetting Position of Adjust Lever EnvelopeEnvironmental Conditions Environmental ConditionColor Ink Cartridge Ink CartridgeBlack Ink Cartridge Input Data Buffer Electric SpecificationSafety Approvals Reliability14.1 ESC/P Control Codes CE MarkingPrinter Language and Emulation „ Dot size control ESC e „ Raster header ESC D „ Raster body Parallel InterfaceForward channel Connector pin assignment and signalsParallel Interface 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 Tack11. Serial interface 12. Connector pin assignment and signalsSerial Interface 13. X-ON/X-OFF, DTR protocolUSBUniversal Serial Bus Interface 14. Connector pin assignment and signalsPin Signal Name Out Function Description Ieee 1284.4 protocol Prevention of data transfer time-out on HostInterface selection Function Bi-directional CommandSwitches Control CodeLED Indications Special Setting Mode18. Special setting mode 17. Status printing19. Printer Status displayed on the control panel ErrorsIndicators Ink Out Paper Out Priority Black Color„ When you need to perform test print after the repair InitializationInitialization Setting Physical SpecificationClassification Name Consumables and options20. Consumables Operating Principles Printer Mechanism Printer MechanismEpson Stylus Photo Revision a Output Voltage 1 C257 PSB Power Supply CircuitOperating Principles of Electric Circuit Voltage UsageTRANST1 Major Elements 2 C259 Main Control CircuitMajor Elements Location FunctionReset Circuit Reset CircuitSensor Circuit Sensor CircuitHead Drive Circuit Timer CircuitEeprom Control 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 Motor, Coil Resistance Check Point Signal Level Switch ModeSensor Check Point Motor Location Check Point ResistancePaper Ink End Check Black Color Error IndicationLED Indication Condition Remedy Symptom Cause Flow Chart Unit Level TroubleshootingSymptoms and Corresponding 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 Sympto Condition Cause Check point Solution Unit Repair Power Supply BoardRepair of the Power Supply Board Repair of the Control Board Repair of the Control BoardEpson Stylus Photo Revision a 10. Repair of the Printer Mechanism Symptom Condition Cause Check Point SolutionUnit Repair 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 Name Supplier Parts No Phillips Screw Driver PrecautionsTools Classifi Check Point Status Cation Work Completion CheckCheck List 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 Adjustment„ Do not scratch special coated surface of the PF AdjustmentPaper Gap Adjustment Epson Stylus Photo Revision B How to use the Adjustment Program Adjustment by Adjustment ProgramAdjustment 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 headU Preventing from the CR motor fall into the non Magnetized condition when the printer has been leftAdjustment, the following screen will be appeared Alone more then 5 minutes in the Head AngulerBi-D Adjustment Bi-D Adjustment Pattern SampleHead Cleaning Initial Ink Charge Protect Counter Value Protect Counter ResetCounter Value for Ink Absorber Maintenance „ Never use chemical solvents, such as thinner, to CleaningService Maintenance Lubrication Point Lubrication„ Never use oil and the grease other than those 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 CN4 Connector SummaryConnector Summary for C259Main Major Component UnitConnector CN7 Connector CN5Connector CN6 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