I bought a very dead PM6680 counter real cheap and the switching power supply was badly burned with a number of components damaged beyond repair, like the transformer. The A.C. to D.C. part of the supply is on the motherboard outside the power supply cage so the supply inside the cage is basically a high voltage input D.C.-D.C. converter. I gave up on repairing the supply but came up with a scheme that worked. Where I'm only going to be seeing 120vac input in the U.S., the replacement supplies didn't have to be wide input range and the nice Cosel supplies I used were 85-125vac rated input.
This is where it got tricky because I wanted to use parts I had on hand and not put a lot of money into this project. I needed +5,+15,and -7 volts to run the counter. I wired a +5 Cosel and a -7 volt Cosel for two of the voltages and used a 12 volt input, 15 volt output D.C.-D.C converter for the third. With the 12 volt input of the 15 volt supply wired between the -7 volt to the +5 volt outputs from the two Cosel supplies , I got the 12 volts input I needed for the +15 volt supply and it worked great. All the supplies output more current than I needed so they run nice and cool. Here is a photo of the repair I did.