Just dumpster dived this thing (1991 vintage 100 kHz audio FFT analyzer with built-in signal generator), and am in need of a service manual/schematics to try to bring it back to life. When powered up, it lights EVERY front panel light and emits a continuous BEEP. That's it. All the internal LEDs on the PSU board light, so presumably all the power rails are OK, and the CRT filament lights up.
After much digging, I was able to find a Japanese language .PDF of the operators manual, but nothing as far as repair/troubleshooting. I tried all the obvious stuff like reseating boards, looking for burned/damage parts, etc. Anyone out there able to help with this one? It appears that Zonic went bankrupt a few years back, and these products were absorbed into IOTech, then into National Instruments, who no longer offer any support.