EPSON Stylus Color 900

Revision C

Whether or not the cooling fan is driven depends on the electrical signals sent from the 2 thermistors (“t1” and “t2” in the figure). The “t1” represents the temperature detected by the thermistor attached to the heat sink on the C265 main board with a screw, while the “t2” represents the one between the printhead pre-driver ICs (IC15 and IC16) on the C265 main board. Table 2-20 shows the thermistor condition and corresponding fan operation.

Table 2-20. Conditions for Driving the Cooling Fan

Thermistor condition

 

Cooling fan:

Cooling fan:

 

 

Operating

Stops operating.

 

 

 

 

 

 

t1 and t2 have detected

t1

≥ °40 C or t2 ≥ 50 °C

t1 ≥ °36 C or t2 ≥ 42 °C

temperatures.

 

 

 

 

 

 

 

Even while the printer is in idle status, the thermistors continue to detect temperatures every 2 seconds for the cooling fan operation. However, 2 error status conditions can be detected in the main routine, since air may not cool down if the fan is defective or the ventilation grill is clogged.

[Error 1]

The printer does not stop printing but continues to print by lowering the drive frequency. For instance, the printer normally prints with the head drive frequency of 14.4 K Hz to perform 1440-dpi print (horizontal) at 200 cps (CR speed). In the error condition, however, the printer can lower the head drive frequency to 7.2 K Hz by reducing CR speed to 100 cpi. Note the printer actually performs printing at 1/3 duty / 1-pass of a normal speed.

[Error 2]

The printer stops printing. In this condition, the temperature at the junction of the power transistor for trapezoidal waveform production and the trapezoid waveform production IC (pre-driver) has risen to the limit (which means the thermistors have detected over 60 °C at both t1 and t2), and the printer generates a fatal error after stopping printing

completely. Therefore, this printer specifically shows a fatal error on the control panel when detecting abnormal temperatures in addition to the following 2 common conditions.

1.Failure in CR home position detection:

This failure can be caused by one of the following 4 reasons:

-CRHP sensor itself is defective.

-There is a deficiency in the circuit.

-Incorrect PG adjustment

-CR motor is defective

2.Failure in ASF home position detection:

This failure can be caused by one of the following reasons:

-ASF sensor itself is defective.

-There is a deficiency in the circuit.

-ASF is damaged.

-Pump/ASF motor is defective.

Operating Principles

Electrical Circuit Operation Principles

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Epson SEIJ98006 manual Conditions for Driving the Cooling Fan, Thermistor condition Cooling fan Operating Stops operating
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SEIJ98006 specifications

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