EPSON Stylus Color 900

Revision C

2.3 Electrical Circuit Operation Principles

The Stylus Color 900 consists of the following circuit boards:

C265 main board

￿C265 PSB/PSE board

C265 Panel Board

2.3.1 C265 PSB/PSE Power Supply Board

This section explains the operating principles of the C265 PSB/PSE board, in order.

AC power supply voltage is supplied from the AC power socket. Then the fuse (F1) limits the incoming current of the AC voltage to avoid damaging the C265 main board and C265 PSB/PSE board. On the other hand, TH1 and TH2 serve to convert surplus input voltage into heat energy.

The input voltage is next input to the RLC parallel circuit (a filter circuit), for higher harmonics absorption. This operation keeps the higher harmonics in the AC power out of the printer, and also prevents leakage of higher harmonics generated in the printer.

After noise is removed, the AC voltage goes through the full-wave rectification circuit. The minus component of the alternate wave is eliminated as the result.

Then the voltage is smoothed by the electrolysis condenser (C11) for stabilized DC voltage, and the current is applied to the primary side of the transformer (T1).

The current, however, does not flow into the primary side of the transformer (T1) if the main switching FET (Q1) located in the primary side is off. The Q1 comes on when the voltage is applied to the gate through the R28, a starting resistor, when the printer is turned on. While the Q1 is on, current does not flow into the secondary side; because a reverse-characteristics diode is used to connect to the secondary side.

The transformer (T1) is gradually charged with the current. When it is full and not charged any more, the gate voltage of the Q1 starts going down gradually. At this point, C13 abruptly pulls in the gate voltage of the Q1 to turn the Q1 off.

Operating Principles

Electrical Circuit Operation Principles

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Epson SEIJ98006 manual Electrical Circuit Operation Principles, 1 C265 PSB/PSE Power Supply Board

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