Search found 6 matches

by nightcheese
Mon Sep 16, 2019 8:12 am
Forum: HELP!
Topic: JX3P just plays single repeating tone and some of the buttons change it?
Replies: 12
Views: 3639

Re: JX3P just plays single repeating tone and some of the buttons change it?

Again I'm not too sure how I'm supposed to read this logic probe so this is the state of each LED on the probe for each pin: pin | high | low | pulse 11: solid | solid | blink 12: solid | solid | blink 13: solid | solid | blink 14: solid | blink | blink 15: solid | solid | blink 16: solid | blink | ...
by nightcheese
Sat Sep 14, 2019 3:52 am
Forum: HELP!
Topic: JX3P just plays single repeating tone and some of the buttons change it?
Replies: 12
Views: 3639

Re: JX3P just plays single repeating tone and some of the buttons change it?

Thanks, that's super useful! I love how relatively simple these machines are, almost crudely simple compared to a modern computer, to the point that I feel like I could actually understand what it's doing. PIN 1 (DIRECTION) = HIGH* PIN 2~9 (A1~A8) = UNIFORMLY HIGH PIN 10 (VSS) = LOW* PIN 11~18 (B1~B...
by nightcheese
Sun Sep 08, 2019 1:06 am
Forum: HELP!
Topic: JX3P just plays single repeating tone and some of the buttons change it?
Replies: 12
Views: 3639

Re: JX3P just plays single repeating tone and some of the buttons change it?

I've finally gotten a logic probe! Had to order one from China since they were discontinued at the local electronic store... Row SW0 (IC46 pin 2) = 1 and 9 Row SW1 (IC46 pin 3) = 2 and 10 Row SW2 (IC46 pin 4) = 3 and 11 Row SW3 (IC46 pin 5) = 4 and 12 Row SW4 (IC46 pin 6) = 5 and 13 Row SW5 (IC46 pi...
by nightcheese
Sat Aug 17, 2019 1:15 am
Forum: HELP!
Topic: JX3P just plays single repeating tone and some of the buttons change it?
Replies: 12
Views: 3639

Re: JX3P just plays single repeating tone and some of the buttons change it?

Thanks for your help, that sounds like a really good avenue for investigation. Just to verify it's not a power thing I measured the voltages across the PSU rails by sticking a multimeter over D1 and D2 and D3 (I'd only measured the 5v on the mainboard) and both the 15v and 5v rails were right +- lik...
by nightcheese
Sun Aug 11, 2019 6:34 am
Forum: HELP!
Topic: JX3P just plays single repeating tone and some of the buttons change it?
Replies: 12
Views: 3639

Re: JX3P just plays single repeating tone and some of the buttons change it?

Hmm okay, disconnecting any combination of CN10 and CN6 doesn't change anything. With just CN6 and no CN10 the same lights are lit but the buttons don't do anything, and it makes the same sound... I guess that eliminates the front panel from causing the issue? Unless it requires a certain signal fro...
by nightcheese
Sat Aug 10, 2019 6:25 am
Forum: HELP!
Topic: JX3P just plays single repeating tone and some of the buttons change it?
Replies: 12
Views: 3639

JX3P just plays single repeating tone and some of the buttons change it?

So I've literally been trying to fix this issue for years with no luck and figured as a last ditch effort I'd ask the experts... My JX3P was working just fine until one day when I accidentally left it on for a few hours and when I came back it was just doing this. Now this is all it ever does: https...