Some Issues
2014-11-26 by nick.oring@gmail.com
Hey everyone! Having some frustrating issues I can't seem to track, so figured I'd ask here :)
I'll go in chronological order of what's been going on and what I've done.
- Bought the Polysix with the battery replaced, but traces weren't pretty.
- Only things that worked were volume, bend, arp section, and then poly/unison/hold.
- MG LED starting slow on power-up -> constant on
- Repaired the traces and replaced the closest electrolytic and 74LS08.
- Same behavior with the controls from above, but now the patch select, save, etc. was working. MG LED still behaving strangely
- Purchased the clone 367, all new IC's, but salvaged the ROM, thermistor, and Q3 (5-pin transistor?)
- Same original behavior with the patch memory not working again and most controls not functioning.
- Tried calibration procedure, getting correct voltage and was able to jumper with a 56k resistor, adjusted VR1 to get all LED's lit, but once I removed the resistor, program 1 & 5 are only lit (no bank).
- Replaced the 2 4051's on the control panel boards with no change.
I think that about sums it up! I made the two corrections to the 367 clone, but I haven't changed the one capacitor to 10pf. I don't know if this might be causing some of the problems, but it was originally problematic, so not sure.
Any help would be awesome :) Thanks so much!