mescalinum Posted January 30, 2010 Report Share Posted January 30, 2010 hi I'm finishing a modular MBSID. actually I've done 1 CORE_V3, 1 SID_V2, 1 LCD 16x2 and works like a charm. I wanted to add banksticks. I made a little two-socket on veroboard (see attached image) (I used eagle cause it helped me to cross the less wires while working on a single layer) anyway, the bankstick appears dead, I double-double-checked solderings, wiring, checked for shorts. I also checked that I have the two air-wires on the core (J4:SC->pin28 and J10:PWM->pin17). the symptom is: when I send program change, it says <No Bankstick>. I'm stuck, I don't know what to troubleshoot further any help would be appreciated, thank you EDIT: oops, it seems the attached image never got here. here it is: Quote Link to comment Share on other sites More sharing options...
nILS Posted January 30, 2010 Report Share Posted January 30, 2010 The schem is correct. A picture of the veroboard might help :) Some shots in the dark: - R2/R12 on the core not mounted/wrong value - Cable between core and bankstick is the wrong way around or broken - You made a mistake in the eagle->veroboard process Quote Link to comment Share on other sites More sharing options...
mescalinum Posted January 30, 2010 Author Report Share Posted January 30, 2010 thanks for your interest The schem is correct. A picture of the veroboard might help :) Some shots in the dark: sorry, I do not have a camera that can take decent photos, so I toke a couple, and added visual hints to one, in case you can't see every spot (click to enlarge) by the way, here are some test I made: (I'm repeating test now, just before hitting SEND) with the bankstick circuit unplugged and ICs unmounted(looking at the schematic I made in eagle), using OHM-Meter: - every IC pin that should be connected to GND, it is in connection with GND pin. every other: not. - every IC pin that should be connected to +5V, it is in connection with +5V pin. every other: not. - the 2 wire data bus does not touch +5V neither GND - the 2 wire data bus is consistent (J4:2 touches only IC1:6 and IC2:6, J4:3 touches only IC1:5 and IC2:5) with the bankstick attached to core, and core powered on, I can measure 5V between GND and 5v on every IC that should exclude problems in the bankstick circuit itself - R2/R12 on the core not mounted/wrong value R2: ok (brown,black,red,gold = 10*100 = 1k) R12: ok 1k too - Cable between core and bankstick is the wrong way around or broken as I said (text in the photo), I refer to red wire on ribbon cable as GND, and I measured +5V between GND and +5V on the bankstick circuit - You made a mistake in the eagle->veroboard process given the tests I made above, it should be very unlikely. unfortunately I don't have access to a logic probe or an oscilloscope... I don't know what to do then. every other part is functional (sid functions, audio output, midi io, etc..) Quote Link to comment Share on other sites More sharing options...
mescalinum Posted January 30, 2010 Author Report Share Posted January 30, 2010 I tried also 24LC256 ICs (always from Microchip) but same result <No BankStick> this should exclude a fried IC. the only thing I couldn't check now is the 2 wire IIC bus... later I'll dismount the core module again and do some more tests... btw, I remember having tested with OHMmeter every single wire after etching CORE, prior to begin soldering Quote Link to comment Share on other sites More sharing options...
mescalinum Posted February 9, 2010 Author Report Share Posted February 9, 2010 damn! :D i got some time to unmount and check CORE module: air-wire from IIC pin to R12 was soldered to the wrong node so I fixed it, and the midibox started to see external banks :) sorry for the fuss (I don't know how to put [sOLVED] in the subject so that this can be helpful to someone...) cheers! Quote Link to comment Share on other sites More sharing options...
mescalinum Posted February 9, 2010 Author Report Share Posted February 9, 2010 p.s. here a couple of shots of the unfinished boy - I steel need to make the panel, I can't find detended encoders through local shop (they have gray code rotary encoders at 5 bits only), I'll have to search on internet shops Quote Link to comment Share on other sites More sharing options...
nILS Posted February 9, 2010 Report Share Posted February 9, 2010 Looking good! I changed the subject for you. You can do that by editing the 1st post and clicking "Use Full Editor". Quote Link to comment Share on other sites More sharing options...
jbartee Posted February 9, 2010 Report Share Posted February 9, 2010 This looks great! What did you use to cut the case like that? That's a very precise, tight seam. Quote Link to comment Share on other sites More sharing options...
mescalinum Posted February 9, 2010 Author Report Share Posted February 9, 2010 This looks great! What did you use to cut the case like that? That's a very precise, tight seam. I first used a manual iron saw (30-40cm blade). Then I smoothed the cut with a belt sander, and then used fine-grain sandpaper - sticked on a very straight plane - to refinish by hand. If you do not have belt sander you can just do papersand by hand... it's just a bit more work. Quote Link to comment Share on other sites More sharing options...
jbartee Posted February 9, 2010 Report Share Posted February 9, 2010 I first used a manual iron saw (30-40cm blade). Then I smoothed the cut with a belt sander, and then used fine-grain sandpaper - sticked on a very straight plane - to refinish by hand. If you do not have belt sander you can just do papersand by hand... it's just a bit more work. Well, that sure beats the hell out of the dremel I've been using for my plastic cuts. A saw like that is a little out of my price range, but it's hard to argue with your results. Beautiful work! Quote Link to comment Share on other sites More sharing options...
nILS Posted February 9, 2010 Report Share Posted February 9, 2010 That's what I use for stuff like that: A bit of a pain with bigger stuff but definitely affordable @ ~15eur Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.