Electronics > Repair
Repair attempt TC-Electronic Nova System: DSP Audio (guitar)
obiwanjacobi:
I was researching where I could buy the chips that were defective. I noticed the DSP chips has on-board ROM and RAM.
So although there is a separate Flash ROM chip on the main board, how can I be sure there is not also some programming in the DSP chip?
So if I pop in a new one - it will not have that programming and the unit will not work - even though the chips are then fixed...
What to do? Abandon the repair or chance it that all the programming is in the external Flash ROM chip?
The three chips that need replacing (at least) will run about $50,= total. For me that is a bit much to gamble with. I could first only buy the DSP (15,= and up) and see if the processor runs again...
Suggestions?
obiwanjacobi:
After careful consideration I have decided to spent another $15,= and try to fit a new DSP chip. Prepped the PCB for its arrival.
howdoesthisthingwork:
Hi guys, sorry for a possible noob hijack of this thread. I have a similar weird problem with a used nova system that worked fine for the first few days but after leaving it on for a few hours it locked up and whatever effects were on at the time stayed on and working. It refused to do anything else. When I powered it off and back on, it booted as normal and worked properly for a few seconds then the same brick thing happened again. I eventually worker out how to get to the factory reset before it bricked, and this did the trick for another day or two before the problem returned. I can boot into the fronttest by holding the boost and delay, and everything works fine. Weirdly, it doesn't freeze while doing this so maybe it's just the DSP that's overheating or something if it's left on. I'm trying to get my money back and get a quote on a repair but I'm definitely considering opening the thing up because I didn't pay a fortune for it. I'd also love to mod it for the 4 cable method. If any of ye have had similar problems any help would be appreciated. Cheers
krivx:
--- Quote from: Zarhi on January 24, 2015, 12:16:11 pm ---Self test menu:
1.Power on while pressing "DELAY" + BOOST".
2.Loop the midi in and midi out.
3.Follow the instructions as shown in the display.
4.Power OFF and ON.
Also there is service note:
If you have a product freezing or rebooting intermittently, especially when performing a drop-test,
you must pay attention to the flatcable.
--- End quote ---
I'm resurrecting this thread as I recently got a used Nova System that I am troubleshooting. My unit will power up and works but freezes after a couple of button presses. It still passes audio, the DSP remains working and the signal is effected but the UI stays frozen until I power cycle. I will reseat the flat cable at bot ends, but I am interesting in your "service note", is that something that came from TC? Is there any documentation that goes with it (service manuals? service bulletins?) Thanks.
obiwanjacobi:
I suspect the smal ATmega in the upper left corner drives that part - since the DSP seems to continue to work.
Check that out, see if there is any change between working state and when it hangs.
Just reseating might not be enough. I would beep-out every wire in that flat cable - just to make absolutely sure.
I have not found any service manuals. tc-electronics is notoriously secretive.
Perhaps PM Zarhi? He seems to know more.
(I abandoned my repair after I found out that also the ROM (on the DSP board) was fried too. I still have the unit though.)
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