Epson 2200 Service Manual - Page 67
Power Supply Circuit Operating Principle - parts diagram
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UPC - 010343841840
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EPSON Stylus PHOTO 2100/2200 2.3.1 Power Supply Circuit Operating Principle The power supply circuit board of this product is the C387 PSB/PSE. The basic structure of the circuit uses the RCC switching regulator method and +42VDC and +5DVC are supplied to the printer mechanism and control boards. The following indicates the applications of the voltages generated in this power supply circuit. Table 2-15. Supplied Power Voltage Applications +42 +/- 2VDC Rated output current: 0.5A +5 +/- 0.25VDC Rated output current: 0.6A • CR motor • ASF/Pump motor • PF motor • Head drive voltage • Logic sensor circuit • Panel LED • Nozzle selection circuit (above Printhead) • Interface control circuit • Ink cartridge sensor • PE sensor • ASF sensor • Cutter HP sensors (left, right) Note: +5VDC applies to only the parts and areas in the above table. 3.3V/2.5V drive components are used as most logic chips (CPU, P-ROM, SDRAM) on the C387MAIN board. Hence, they do not operate at the +5VDC regulator DC generated by the C387PSB/PSE. Each 3.3V/2.5V drive chip operates at 3.3V/2.5V reduced by the 3.3V/ 2.5V generating regulator on the MAIN board circuit. The following is the block diagram of the power supply circuit. Revision B Figure 2-18. Power Supply Circuit Block Diagram OPERATING PRINCIPLES Electrical Circuitry Operating Principles 67
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