Galaxy 2100 frequency counter problem

[Gman]

My prized Galaxy 2100 frequency counter went out. Radio works fine though. I replaced all electrolytics, even scraped out the dried up glue. The rest of the radio also had all the electrolytics replaced. Freq counter board # EPT210010A. Radio stamped Taiwan. On the counter board, 3.2768mhz xtal and 10.6975 mhz xtal oscillating. 8 volt regulator good. Tuning the coil next to the 10.6975 xtal displays (on the freq counter) either 10.695, 21.390, or 32.085. Where do I go from here? Per the schematic, looks like there is 1 wire on the counter that takes input from the main board. Anyone know what that signal is?
Thank you.

 

[Gman]

Found some things on Secret CB #26 Im going thru now too.

 

[nomadradio]

That counter can be a hair-puller when it breaks. It takes the 8 Volt regulator output and passes it through a 3-Volt zener diode to supply the 5-Volt chips. We got in the habit of taking a 3-terminal TO-220 7805T regulator and placing it face down with the input and output pins in the holes where the zener had gone. Needed a wire on the center leg for its ground connection. Never did have one of them break down, but that zener could cause headaches. Probing the 5-Volt side of the zener with a 'scope will reveal if you have noise spikes riding on the 5-Volt DC supply. That can cause quirky issues. I was immensely relieved when RCI stopped making that counter module in 1995 and went to the surface-mount counter module. Couldn't be serviced if it broke, but it was a lot more reliable.

Checking the 5-Volt supply may help to explain the gremlins.

73

 

[Gman]

Thank you sir. Im on it.