HP integral : schematics / pinouts sought...

I have all three of the service manuals for the IPC and the Service ROM. According to the manual, when you turn the IPC on the yellow light on the printer reset button should flash twice and then go out. Then the print head should move to the right and then return home. Next the red lite on the disk drive should light momentarily and the drive should click. About three seconds later the display should light up and display "Executing the RAM, MMU, and the short keyboard test, please stand by". Are you getting any of those? The manual is quite clear that the most likely fault that prevents turn on is a power supply fault. It doesn't give any information about the display itself except for a general description (512 x256 pixels) and that it uses 180 to 200 volts to operate and that the HV drivers are on the driver bvoard attached to the screen. There is a description and schematic of the Logic Board B that interfaces to the display. Mostly it just converts the display data to a serial format and the data is sent into the display serially and there is some fancy timing to reverse the polarity of the high voltage on alternate screen cycles to prevent degrading the screen. Joe Ij:09 AM 3/10/05 +0100, you wrote: ----------------- ------------------