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Thread ID: 117146	2011-04-04 12:50:00	Canon PIXMA iP4000 - no power-on light	Robin S_ (86)	Press F1

Post ID	Timestamp	Content	User
1191965	2011-04-19 13:38:00	Thanks Agent. I too consider the switch a possibility, especially as I could detect only 1 live terminal on it regardless of the switch position. The logic board is also a "person of interest". The service manual I have is rather once-over-lightly and doesn't include a wiring diagram or any details of voltages at terminals. I have only had the covers off so far but will disassemble it further when I get the chance.	Robin S_ (86)
1191966	2011-05-20 03:45:00	I managed to figure out how to get the cover off today, also managed to get the damn PSU open as well. Everything looks great, no burnt ICs, bloated capacitors etc... and the capacitors are high quality too. Then, after looking again for a service manual I found this post: From reading other posts it seems that a bad head can kill the logic board. But I wanted to first check the supply and took it out of the instrument. The connector has 5 pins, the 2 black are GND, 2 of the others are 24V and 32V and the one on the end toward the edge of the board is Sense. It is NOT the same as an ip4200. AND you will see 7.5V and 10V until the sense line is active, the sense sits near GND if the AC adaptor is taken out of the printer. The sense line goes through a 1k resistor and to the base of an NPN transistor on the power board. I couldn't find a Serv. Manual online so I just figured it out myself. Anyway, I put 3.3V on the sense pin (almost anything will work because of the 1k resistor) and GND on one of the GND pins. That made the other two pins go from 7.5V/10V to 24V/32V. So apparently there is a low power mode and normal power mode. So, if this is happening to you then you have some choices: 1) Assume that some head sensor is saying the head is bad and so the printer won't turn on. However, I have read that if the head goes it can kill the logic board. So if you put in a new head, the bad logic board can kill a good printer head. Take your chances. 2) Spend the money and buy a ip4300 service manual (or try to debug using the ip4200 service manual) and figure out why the sense pin isn't being driven by the logic board and fix the problem. Good luck (www.copytechnet.com) This confirms what I suspected about the PSU, so likely the PSU in mine is OK as well. (By the way, Blue and Red are Power, Black is ground and Yellow is Sense\Startup) - although that probably won't help you as you've got a different model printer :( Probably the logic board isn't giving the power up signal to the PSU for some reason. Perhaps due to the print head issue as described by the person who posted the above information. Without a schematic it's hard to think about... and everything is pretty much done in some BGA ASIC anyway, and if that's blown it's a lost cause. Maybe I will try some things... we shall see.	Agent_24 (57)
1191967	2011-05-20 04:19:00	Well this is interesting... Just tried checking the startup wire voltage, got 3 volts OK then noticed a light was flashing... the orange light flashes 10 times, pauses, then repeats over. Apparently 10 orange flashes means "VH monitor error" and THAT apparently means a problem with the print head voltage. Solution (from manual) : replace print head\replace logic board...	Agent_24 (57)
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