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G6fylneil · 5th Jan 2022, 8:20 pm

I discovered the same 5V rail sense problem with my 1604. I assumed the PSU had been changed at some time, but I didn't have another 1604 to compare it to. I lifted one end of the resistor (which isn't on the component layout I have), which I assumed was half of a potential divider and jumpered the sense line to the 5V rail. I think my 1604 was built in 1990, I bought it in 1999, and it worked well for many years, but now the little tants keep blowing, the front panel push switches have gone high resistance, and the fumes from the mempaks have stopped the RTC from working, but I don't have the enthusiasm to fix it at the moment.

5th Jan 2022, 8:20 pm	#7
G6fylneil Pentode Join Date: Sep 2011 Location: Coventry, West Midlands, UK. Posts: 210	Re: Gould 1504 repair I discovered the same 5V rail sense problem with my 1604. I assumed the PSU had been changed at some time, but I didn't have another 1604 to compare it to. I lifted one end of the resistor (which isn't on the component layout I have), which I assumed was half of a potential divider and jumpered the sense line to the 5V rail. I think my 1604 was built in 1990, I bought it in 1999, and it worked well for many years, but now the little tants keep blowing, the front panel push switches have gone high resistance, and the fumes from the mempaks have stopped the RTC from working, but I don't have the enthusiasm to fix it at the moment.