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You can take the purge unit out as a single asm without take it apart. I believe there is only one screw holding the Purge unit in place, but there are two logic cable that come from the logic card that have to be unplugged and carefully routed through openings to get the purge unit out. One cable is the drive for the purge motor and one is the signal cable from the photosensor.See my post #5. I can see the sensor U shaped with 3 wires. And the blades that move inside it. The blades move full circle. That means that everything works, as far as mechanics are concerned?
Once you get it out you can carefully turn the gear and watch each step of the process. If the locking tab move up and down and the wiper comes forward and back, this is telling you that all the gears are working ok. There are two parts to the photosensor. One is the led that generates the light and the other is the photo sensor. Either one can cause the failure.On my printer the only sensor is U shaped without any LED.
The tab may be moveing up and down but it has to be down at the correct time, else the carriage can't move to the left.No movement of printhead the thing is dead.
The only thing that generates the 5C00 error is the timing from the photocell signal.The tab moves and stops where ever it wants
The voltage to turn the LED on comes from the logic card via the small three wire cable. It could be a bad connector, at either end, or a bad socket on either end, or the LED or the Photocell.Perhaps that's why the tab stops up or down position at random - no signal. But if I disconnect the sensor I get another error don't remember what is was. I taught that means the sensor is OK
The small black "U" shaped unit on the tiny PC card is a combined led, photosensor. You can not buy these as parts from Canon, as they do consider those as replaceable parts, only the entire "FRU" which is the Purge Unit. A FRU is a "Field Replaceable Unit". All FRU's have part numbers. Individual components done have "Published partnumbers"I checked the wires with a multimeter they are OK, did not check the voltage don't know what to look for.
Hi Smile, I just send an email msg to you. If you are going to keep the timing strip, I understand. However, if it's really of no use to you, I hope I can give life to your timing strip by using it on my printer.Trigger 37 said:Smile,..None of the printer manuals since the early i550 listed the value of the purge motor voltage. It is only listed as 4 wires, Phase A-AB-B. It is developed from another voltage through a gated driver. The 4 phases are used to drive it in different direction. It will suck black ink in one direction and colors in the other. You probably need 12 volts across the correct pins. Pins 1 &3 and 2 &4 should be the pairs that drive but only one set at a time. Do 1+3 using +-12 and I bet it will go forward.
I am not very optimistic in what you are trying to do. There would have been much simplier ways. For all the time and parts you've wasted, you could have purchased one of my manuals and had all this infomation up front.