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  1. 31-07-2010 #11
    irving2008's Avatar
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    irving2008
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    Right, decimated the board lol

    Attached is circuit diagram for the wiring to the daughter board. Q1/Q2 are the opto, the 6-way connector to the top left is the connection to the output connector. Also attached are pics of daughter board, will start tracing that through later this evening/weekend, and main board after decimation.

    On the 6way, pin 1 is the control volts Ucr, pin 2 is SYSOUT, pin 3 is the 50v rail internal to the PSU (via temp compensation so can be used to control output voltage on load in a system), pin 4 and 5 I suspect are +/- voltages to the control board and pin 6 is common.

    It is likely as ecat says that R11/R12 and R33/34 are the dividers providing upper and lower voltage control limits, why there are two isn't clear. Adjusting either R11 or R33 may not change the output voltage, but merely adjust the levels at which the SYSOUT function changes state... some experimentation needed there... but getting closer...
    Attached Thumbnails Attached Thumbnails Click image for larger version.  Name: 50v PSU output wiring.gif  Views: 322  Size: 30.5 KB  ID: 2488   Click image for larger version.  Name: DSCN1886.JPG  Views: 324  Size: 391.2 KB  ID: 2487   Click image for larger version.  Name: DSCN1885.JPG  Views: 269  Size: 379.0 KB  ID: 2486   Click image for larger version.  Name: DSCN1884.JPG  Views: 285  Size: 410.8 KB  ID: 2485  
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