Thanks so much, guys. I figure ask twice and solder once before removing the DX7’s motherboard!?
The 6.2v Zener diode for location ZD1 has arrived (in a kit), but I don’t have the other?OA95?diode yet for location D4 (or a spare kicking around, unfortunately).
1) Can I test either diode on the motherboard with my rudimentary multimedia without removing or unsoldering anything first? Also, I’m assuming it would be tested while it’s powered on? It would be great to be able to successfully test it. Plus, if the one that’s still in there is good, I can just return this kit.
2) Which would you check/replace first? The Zener diode at ZD1, or the OA95 diode at D1?
3) As you said: ?"It's unlikely to be a supply voltage issue, but you can check. If you attach a DVM to the RAM power pins (24/12) you can see if the voltage is dropping too low when powered off. If the diode from the battery (D4) is good you should still have around 3V there.”?
I’ll definitely check this…you’re saying that if the voltage drops when it’s off - that Zener diode is shot? I remember briefly testing the voltages and things seemed a bit squirrelly...
4) BTW - Maybe I’m missing something, but I couldn't see the ?attached photo from the last message. As I’ve worked with diodes before, thankfully I’m good per orientation - as that’s really important. :)
Thanks again! - Seth
