Electrical Circuit Operating Principles | Epson C40UX instruction

Stylus C40UX/C40SX/C20UX/C20SX

Revision A

2.2 Electrical Circuit Operating Principles

The electric circuit of the Stylus C40UX/C40SX/C20UX/C20SX consists of the following boards.

Main board:	C413 MAIN (USB)
	C413	MAIN-B (Parallel)
Power supply board:	C417	PSB/PSE Board

NOTE: The C413MAIN/-B board is used for the product in the first mass production and it will be changed to C413MAIN-C/-D board at an early date. The major difference is that a single chip which integrates the ASIC, CPU and PROM is used on the C413MAIN-C/-D board.

C413 MAIN-C (USB)

C413 MAIN-B (Parallel)

This section provides operating principles of C413 MAIN/B Board and C417 PSB/PSE Board. Refer to Figure 2-19 for the major connection of the each boards and their roles.

2.2.1 C417 PSB/PSE board

The power supply boards of Stylus C40UX/C40SX/C20UX/C20SX use a RCC (Ringing Chalk Converter) circuit, which generates +36VDC for drive line and +5VDC for logic line to drive the printer. The application of the output voltage is described below.

Table 2-7. Application of the DC Voltages

Voltage		Application

	• Motors (CR Motor, PF Motor)
+36VDC	•	Printhead common voltage
	•	Printhead nozzle selector 36V drive voltage

AC voltage input from AC inlet first goes through filter circuit that removes high frequency components and is then converted to DC voltage via the rectifier circuit and the smoothing circuit. DC voltage is then lead to the switching circuit and FET Q1 preforms the switching operation. By the switching operation of the primary circuit, +36VDC is generated and stabilized at the secondary circuit.

C413 MAIN-A/B Board

+5VDC

+36VDC

C417 PSB/PSE

Board

Printer Mechanism

CR Motor

PF Motor

Print Head

HP/PE/IC Sensor

Figure 2-19. Electric Circuit

Operating Principles

Electrical Circuit Operating Principles

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Image 41

Epson C40UX service manual Electrical Circuit Operating Principles, 1 C417 PSB/PSE board, Application of the DC Voltages

Contents

Stylus C40UX/C40SX/C20UX/C20SX General Notice Precautions About This Manual Revision Status Contents Disassembly Adjustment Product Description Eeprom 29 H bit 0 value Model Delay time during printing Delay of oparationDifferences between the Stylus C20 and the Stylus C40 Throughput Horizontal Printable area Available dot CR Speed Physical SpecificationPrinting Specification Paper Feeding Electrical specificationInput Data Buffer Feed condition Time Speed Envirormental Condition Safety ApprovalsReliability Acoustic Noise Parallel Interface Forward Channel Signal name In/Out Function descriptionUSB Interface Parameter Parallel I/F mode Typical time of tackParameter Minimum Maximum Parallel Interface Reverse Channel Pin No Signal Name ReturnG Functional description Prevention Hosts from Data Transfer Time-out IEEE1284.4 Protocol Control Panel Operate SwitchPanel Functions Printer Condition and Panel Status Printer Initialization Errors Paper Handling Paper Specification Printable Area for Cut Sheet Printing Area Size Paper LMLeft RMRight TMTop Black BM Color BMMargin Color Ink Cartridge Black Ink Cartridge Operating Principles Printer Mechanism Overview Printhead Sectional Drawing Printhead Ejecting State Normal StateInk Path Ink Cavity Items Specifications Carriage Motor SpecificationCarriage Mechanism Detection position I/C change position † PF motor drive transmission path PF Motor SpecificationsPaper Feeding Mechanism Paper Loading Mechanism ASF Unit † Switch the PF motor drive to ASF unit side † Clutch Mechanism ASF unit function & PF Motor rotational direction† Transfer the PF motor drive to LD roller † Paper Return Plate Pad holder 11. Disengage & Clutch mechanism 13. ASF Paper Loading Sequence PF motor rotational direction & Ink System Mechanism Ink System Mechanism Wiper with the cap unit 16. Cap Mechanism 18. non porous pad in cap Stylus C40/C20 Non porous pad in cap † Timer Cleaning † Manual CleaningInk Sequence † Initial ink charge † Flashing Printing mode for Black mode Printing modePrinting mode for Color mode Application of the DC Voltages Electrical Circuit Operating Principles1 C417 PSB/PSE board TRANST1 Main Elements 2 C413 MAIN/B Board Troubleshooting Motor Location Check Point Resistance Sensor Name Check Point Signal Level Switch ModeSensor Check Point Error Indicator of Operation Panel Troubleshooting with LED Error IndicationsError Condition and possible cause Printer Status Indicators Priority Power Error Step Detail phenomenon Check point Remedy Paper out error indication Spur gear 35.2 is Rotating If it is no problem, proceed Paper jam error indication 11. Paper Jam Error indication 10. Paper jam error indication12. Ink Out error indication Detail phenomenon Check point Remedy 14. Paper is always loaded without any print job 15. Fatal Error indication13. Multiple papers are always loaded 17. Dot missing occur and it is not recovered with CL 19. Dot missing occur and it is not recovered with CL 18. Dot missing occur and it is not recovered with CL 21. Print quality is not good 20. Print quality is not good 22. Print quality is not good Disassembly and Assembly Printer Precautions Et que le cordon d’alimentation soit debranche Tools Name and Specification Outward FormScrews Name Supplier Parts No Work Completion Check Work Completion CheckClassifi Check Point Status Cation Classifi Check Point Status Disassembling Flowchart Disassembly Edge guide Upper housing removalUpper housing CBP 3⋅ CBS P2 3⋅ ASF unit removal Tube stopper Waste ink pad „ Waste ink counter reset operation. Refer to SectionWaste ink pad removal „ Tightening Torque for screw +/-1 kgf.cm PS unit removalCN2 PS unit S 3⋅ P 3⋅ Protrusion Paper eject roller removalCBS 3⋅ Front Frame Gear Paper Eject roller USB Type CBS 3⋅ Parallel Type F.S-Tite 3⋅ Switch cover HooksMain board removal 22. Removing the Main board 21. Disconnecting the connectors CR motor removal Carriage unit Printhead unit removalCarriage cover Printhead unit 30. Disconnecting the FFC LD unit Cables LD unit removal Printer mechanism removal Adjustment Performance Priority Required AdjustmentRequired Adjustment Adjustment Program Initial Setting menu Main Menu Service Adjustment Program featureBasic adjustment items Feed command until the paper is set in the ASF Bi-d adjustment even if the paper is out in the ASF. When Head ID Eeprom initial setting Read out the Head ID from the Eeprom Bi-D 10. Choose the Bi-d adjustment USB ID 13. Bi-d adjustment input menu 15. Choose the USB ID input menu 16. Choose the Top margin menu Top margin For the initial ink charge operation is so large Head cleaningInitial ink charge 21. Choose the Refurbishment for DOA menu Refurbishment for DOA Check the present counter value Protection counter check Excepting ESP Clear the present counter value 26. Eeprom check function Eepron check Eeprom back up data 29. Eeprom backup data 31. A4 Check pattern 15 A4 pattern will print 32. A4 Check pattern Maintenance Cleaning † Head Cleaning Service Maintenance† Maintenance Error Clear Lubrication Lubrication Type/Point Remarks Lubrication Type/PointMain frame Right side view 200mm Appendix Major Component Unit Connector Summary Pin CN9-Printhead Eeprom Address Map Address Explanation SettingEeprom Address Map Factory Appendix Eeprom Address Map 103 Appendix Eeprom Address Map 104 Market Eeprom address Eeprom setting Bit7 Bit6 Name modeBit3 Bit2 D4mode Bit1 Bit0 D4mode C413MAIN component layout Component Layout Appendix Component Layout 107 Ref No Description Parts ListParts list Stylus C40UX/C40SX/C20UX/C20SX Exploded Diagram Exploded Diagram Appendix Exploded Diagram 110 Appendix Exploded Diagram 111 Stylus C40UX/C40SX/C20UX/C20SXRevision a Appendix Exploded Diagram 113 Appendix Exploded Diagram 114 Electrical Circuits Page Page Page Page