How is the power supply? All rails ok? Input/output capacitors not bulged nor leaked?
2016-11-11 21:36 GMT-02:00 Michael Newton <michael.new...@gmail.com>: > I acquired a working HP Draftmaster RX (HP part # 7596B). > > An awesome machine, 36" roll feed and 8 pens, complete with several pen > carousels, user manual, and hundreds of working pens. > > I was very excited to make a splash in the art world with this thing. I did > get it to perfectly draw a 3 color demo page from the front panel. > > Thereafter it started displaying errors on the display such as "200" which > means it needs "mechanical calibration". > > Thanks to hpmuseum.net I acquired the service manual > <http://www.hpmuseum.net/document.php?hwfile=1292>, which catalogs many > calibrations and self-tests to run from the front panel, including the > aforementioned "mechanical calibration". > > So I power up with the appropriate front panel keys depressed to run this > calibration. The paper drive motor starts making noise, but the paper > rollers aren't turning, and the LCD display is blank. > > Since that moment, the LCD display is always blank so it is currently a > boat anchor. > > It's a terribly sad state of affairs. I have basic electronics and > mechanical skills and an oscilloscope so following the troubleshooting > procedures in the manual I might be able to identify a part to replace. But > of course, parts for sale online are are rare, expensive, used and probably > untested. > > Probably better would be lower-level repair of whatever parts are faulty > but that's probably more than I can manage at my skill level. > > I'm in Seattle, WA. Is there anyone alive in the pacific NW who will pay a > visit and help me fix this thing? (The only company I found that admits to > working on pen plotters is 360tech in Austin, TX.) > > Or someone elsewhere I could ship electronics parts to for test and repair? > Or provide guidance, or help in any form at all? > > thanks > M. >
