Well i’m switching to a debug phase on my MB-6582 build. This is a kit from smash Rev2 pcb. All components are pluged in and soldered. CS assembled. PSU for 6582 chips. Ran a 5vdc wallwart and a 9vac wallwart into a 7pin din plug. PSU tests out. J3=5.12vdc, J25=10.34vdc, J4(9v peg)=8.97vdc, J1_sid 9v=8.97vdc, pin 28 on sids also =8.97 when jumper is in place. Pin 9 on lcd equals 5.12vdc. Pics from smash with Mios V1.9F. J11 jumper not installed yet, R80 is installed. I am a bit stumped.
When turned on with all ic chips the following occurs: Inital all led’s light for split second, lcd redbacklight lights for a moment, crystals on lcd do a funky dance.
I am a bit lost to what may be next for testing.
Is this normal in a J4 & J3 5vdc - grd continuity check: When i initially touch the testing leads to the 5vdc and grd there is a brief beep then nothing, on all other linked tracks the beep continues. Is this normal?
Some of the ribon cables between the Main PCB and the CS look ugly. I will check these better.
Any ideas on what to check next would be greatly appreciated as I am a newbie noober boob.
What exactly is and isn’t working? I am kinda missing that info in the post
When i initially touch the testing leads to the 5vdc and grd there is a brief beep then nothing, on all other linked tracks the beep continues. Is this normal?
Yes. Your multitmeter charges the caps for a moment, once they’re charged the beep ends.
I am not sure what is supposed to happen on start-up. In the build guide it says to upload the test tone. Is there supposed to be a different reaction at start-up that says ready or something? When the lcd did a little random dance and then nothing I got confused “lack of knowledge” as to what next. Is it time to start the testone then MB-sid upload? I have not done that before or researched how on the forum yet. The pics already have MIOS v1.9 as they came as so from smash.
In checking some of the ribbon cables i did find a couple of linked ribbons that were side by side. I will fix. Thanks for the confirmation on the 5v to grd check figured it was a capacitor thing.
Is there supposed to be a different reaction at start-up that says ready or something?
Yes with the bootloader + MIOS loaded on the PICs (as they shipped from me) the display should show a copyright message then “Ready.”
I suggest starting it up with your meter connected and looking for a drop on the 5v power rail as it lights the LEDs…a working PSU will show little change, but a weak one will often drop below the operational power threshold of the PIC (and other components).
Much thanks for guidance I will play with the PSU. I bought two wallwarts as the c64 powersupply I bought off ebay did not work. the wall warts may be the issue
On the half broken ebay C64 powersource, the 5V side works and the 9vac side doesn’t. I tried it again with soldering in the other 5vdc c64 source (instead of the 5vdc wallwart) and kept the 9vac wallwart for the 9vac pins the same thing occurs (quick flash of all led’s backlight flashes on then only fan noise remains). Through elimination it says that if it’s the PSu its the 9vac side as both 5v sources yield the same result. I tried putting a meter on when i flick the switch on but the meter is slow the led’s flash on and off before the meter gives a good reading. In another post I read that it may be the P2_core trim pots so i tried cranking them and no change. I rechecked the ribbon cable to the lcd and pins 1-16 all have connection. It’s a crystalfontz lcd I matched the pins 1-16 at J15_core1 to the 1-16 pins on the lcd.
i will change and report back. I essentially matched J15 pin 1 to lcd pin1 then j15 pin2 to lcd pin2 etc. Silly me for thinking it was as simple as connect the matching numbers.
Item 2: loopback chec on midi with mios. all cores check out
Item 3: only one pic of the 4 will link to mios,
Item 4: Uploaded MB-6582 setup hex, to the one working pic
Item 4: IT PLAYS NOTES SENT FROM MIOS AND JOMOX WAHOOOOOOOOOOOO!!! but only in core places 2 thru 4
Item 5: When the pic is in core place 1 it just beeps continuously, not notes just beep beep beep beep beep beep,
Item 6: the lcd does not say anything and the buttons and nobs have no affect, when the working pic is in core places 2 thru 4 the lcd does not light up, when it is in place one it lights. all display gibberish
At start up the following happens:LCD is not displaying anything, matrix lights up then has a pattern that flutters while it looks like it is thinking…booting up??? some sid noise are present from each sid (changed headphones to each jack), the buttons & knobs are non responsive and
Again no help from the LCD. not seeing “ready”
Anybody out there? It feels so close now that some sounds are present. It seems like the control surface is not enguaged or configured.
Back at the debug after a dead hard drive BLUE SCREEN OF DEATH!!!
New report:
I REREREREREREREREREREREREREREChecked the LCD wiring, with confidence its good, so it’s being fed garbage is the new theory. Have loaded the lcd interconnection test Hex. and there appears to be a problem. I did also fill in the pads on the bottom of the PCB for 8 bit mode.
When running the test for 5V on the data pins (any of them) D2 & D3 always show up with ~1.6v when they should be 5 or 0 pending the test. All other data pins react as they should.
The solder was removed from the pads on bottom. I also ran the testtone app and it seems to work,quite high pitched. It will also play a midi note when the mb-6582setup hex is installed. My inexperiance is shinning at the moment. When i load up the setupmb6582 hex am i supposed to be changing anything in the code or just a simple upload? When i initially had the LCD hooked up wrong way back earlier in this post could it have buggered up the lcd? It’s lighting up the back light but none of the crystals are doing anything.
If your LCD is still not working, consider the possibility that you cooked it by wiring it up the wrong way. I have cooked multiple LCDs from wiring errors. They seem to be very sensitive. I lost one on the 6582 from wiring and spent a lot of time trying to “troubleshoot” the LCD when there was nothing that could have been done.
I recently had a Sammich LCD die after about, oh, a few hours use. There is no chance of a wiring error with the Sammich due to Wilba’s cool design but the LCD died anyway. This could have been from static electricity as it is rather cold around here at the moment.
The only way to really check these sorts of things is to have a known good LCD that is wired up correctly, and then temporarily transplanting it on to the new unit to see if it works there. I happen to have a 3rd Midibox with a working LCD (but with some horrible noise somewhere that I could not figure out and hence the box was abandoned). This one is my test LCD. It got me through the two troubleshoots above.
new thought… when i pulled the cs ribbon wires earlier in this build off of the cs panel some of the pads came off of the top of the soldering hole this may have goofed up the plane where jd09 5v attaches. if this 5v plane was affected would it bugger th lcd?
I believe that #4 connects to a 5v plane (light purple in this file=> MB-6582_CS_PCB_R2_Color.pdf ). Can someone confirm? Some of the other solder hole pads i am not as concerned about,leds & encoder pts. most can be connected with a jumper as a fix.
