EPSON Stylus Color 900

Revision C

￿AN7 (Pin 112)

The TH1, located between 2 pre-driver ICs (the head driver ICs; IC15 and IC16) on the main board, monitors temperatures around the board. A Pre-Driver IC is exclusively developed to create intricate trapezoidal waveforms which vary depending on the model. It uses +42 VDC and high frequency to produce trapezoidal waveforms. Therefore, if any relevant trouble has occurred, it is assumed that the driver is overheated. The TH1 works to detect this kind of unexpected rise in temperature at an early stage and stop

￿printing.

AN6 (Pin 111)

Four power transistors (Q3 - Q6) used for trapezoidal waveform production are directly attached with screws to the large heat sink (a radiation plate) on the main board. Since the printhead supported by the Stylus Color 900 supports very high driving frequency (28.8 KHz), higher than ever, and a large amount of PZT, radiation from the discharging transistor used for trapezoidal waveform production is huge. Therefore, the cooling fan on the board forces out heat around the radiation plate. A thermistor fixed on the radiation plate sends signals to the AN6 port of the CPU to allow the CPU to

￿manage the cooling fan’s on/off operation.

AN5 (Pin 110)

The electrical signal input to this port is a temperature signal sent from the thermistor included in the printhead unit. The function of this thermistor is, same as before, to precisely detect temperatures around the printhead and feed back information to the C265 main board. Based on the fed back information, the printer manages subtle change in the voltage level of the head drive trapezoidal waveform, and also can eject the correct amount of ink as it is aimed at any temperature.

￿AN4-ANO (Pins 1, 2, 9, 10, 4)

The nozzle selector IC is attached inside the printhead. It determines which nozzle is used to fire ink according to serial data sent from the ASIC (IC2). A temperature detection circuit included in the nozzle selector detects the temperature of each actuator in the 5-row PZT array. This must be performed to avoid false firing. If the printhead continues the firing motion, but no ink is ejected, the temperature inside the printhead rises to 100 °C and the printhead might be damaged as a result. To prevent this from happening, the abnormal temperature detection circuit is included in the nozzle selector circuit.

The followings are possible reasons for false firing:

1.If an ink cartridge has been removed before its life end and is installed again, the ink consumption counter value is upset, and the counter fails to detect the actual remaining ink level. This wrong operation dangerously causes the printhead to keep firing without any ink remaining in the cartridge.

2.Serious dot missing can also cause false firing. In this case, there is enough ink in the cartridge, but it does not properly flow into the head because of a clogged nozzle(s). If the PZT is driven without any ink flow, heat generated by the nozzle movement can not be released, and this makes the temperature around the head abnormally high.

3.Strong vertical impact applied to the head causes a considerable amount of ink around the nozzle to leak all at once as well as damages meniscus on the head surface. As a result, ink does not properly eject at the next printing and ends up in a false firing status.

Operating Principles

Electrical Circuit Operation Principles

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Epson SEIJ98006 manual Epson Stylus Color Revision C
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SEIJ98006 specifications

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