Hi! I purchased a BK Precision 1788 broken off ebay about 4 months ago with hopes of repairing it back to life.
When I originally got the unit, it showed a bunch of garbage on the display (1st image). I took the PSU apart and visually inspected it. Interestingly enough, I was the first one in. The board showed no signs of 3rd party rework, as all the connectors had silastic compound on them. I did notice that one of the rectifiers on the heatsink was manually resoldered by hand and that a mosfet on the opposite side of the heatsink was reworked. That's about it. This must have been done at the assembly plant because in order to replace either of those components, you would need to remove the (2) large filter caps and then re-apply the silastic compound around the base of the caps.
The 1788 is part of the 1785B series. Another eevblog post mentions that the 1785/1786/1787/1788 may use the same service manual.
http://www.bkprecision.com/products/power-supplies/1788-0-32vdc-0-6a-digital-readout-dc-power-supply-w-rs232-intfc.htmlAfter resoldering some of the main PCB solder joints, touching up some of the VFD solder joints and reassembly, the PSU now displays a solid "Error data" on the VFD. The VFD also flashes all of its indicator lights about every second during operation.
I checked the 1788 instruction manual and it does not specifically mention "Error Data." The manual, here:
https://bkpmedia.s3.amazonaws.com/downloads/manuals/en-us/178xB_manual.pdfmentions only "ERROR CAL" and "ERR EEPROM"
I am wondering if anyone knows what the "Error Data" error code means and if there is any way to get past that error flag.
Also, if anyone knows where to find a 1785/1786/1787/1788 service manual, that would be fantastic.
Thanks a ton guys!