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So I’ve soldered everything (from what I can tell) needed to get the Polysex mod going. But right now my Polysix is only making strange noises, and not on all keys, with most controls on the keyboard (from Polysex mod or otherwise) not doing much (and it worked fine before starting the mod). I’m guessing more than one thing is wrong, but not sure what. I’m a very beginner solderer, but I did check for continuity, and most of my links seem good.
Here are my questions:
1) I ‘think’ I have the new board model, but if not, that would explain the problem. There is a small board connected to my 366, but it doesn’t say 396 anywhere on it, and from what I can tell the connections look different from that shown in the picture of 396 in the Tubbutec construction manual. I don’t think I messed this up, but if I did it would explain a lot.2) I had a lot of difficulty soldering to the IC 30 chip, and had to redo it several times because the solder smeared along all many of the top connections (I need a smaller soldering iron) and I worry if I may have fried the chip (or another component along the way). How would I know?
3) any ideas on how to track down what I’m doing wrong? I’m thinking to start to double check I didn’t wire any of my connections wrong, but this sort of large scale problem seems more than just one wire in the wrong place, no? I’ll try to post pictures in a followup post.
here’s some pics. please excuse my terrible soldering!
whole board
as messy as the solder joints look, they don’t touch, I made sure with the cutter blade.
I fixed the missing connections at the bottom of the pitch section after this pic was taken, and the audio after that was what I checked and it didn’t work.
doggie hair got on the lens in this pic, please ignore.
another angle
tried doing this without a dremel tool cause it was like 100 to buy one at the hardware store and I was running low on cash. Lesson learned, do NOT try doing this without a dremel tool or it will get messy!
another angle, probably clearest.
showing how it’s wired to the rest of the board.
doggie toy visible in the background.
cosmetically it came out nicely, only some scratches cause I didn’t use a dremel and slipped a few times with the metal shears.
from top.
Hi I took a look at your pictures. Very hard to tell if there is a wrong connection or not. But even harder to tell – if not impossible – if there are not any shorts between the pins. The soldering looks a bit suboptimal as far as I can tell.
Take a multimeter and check all the connections for continuity and make sure adjacent pins are not connected. If necessary use a solder pump to remove all the solder and start again. There seems to be quite a bit too much solder on the pins.From what you describe there might be a fundamental problem. Check all the voltages (-5, +5, -15 and +15). Are the LEDs and buttons on the front panel working?
puggle wrote:
I’m a very beginner solderer, but I did check for continuity, and most of my links seem good.Please make sure all of the connections are good..
puggle wrote:
Here are my questions:
1) I ‘think’ I have the new board model, but if not, that would explain the problem. There is a small board connected to my 366, but it doesn’t say 396 anywhere on it, and from what I can tell the connections look different from that shown in the picture of 396 in the Tubbutec construction manual. I don’t think I messed this up, but if I did it would explain a lot.It seems to be the new board model. The additional board is probably a midi retrofit, maybe the CHD?
puggle wrote:
2) I had a lot of difficulty soldering to the IC 30 chip, and had to redo it several times because the solder smeared along all many of the top connections (I need a smaller soldering iron) and I worry if I may have fried the chip (or another component along the way). How would I know?
Hard to tell from pictures alone. You’d probably need an oscilloscope to see if the chip is still working correctly.
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