First of all, hi everybody, while it's been a while following this forum this is kinda my first post, and sadly for a troubleshooting advice.
Actually the trouble is with a gamma1 full, originally to be paired to a gamma2 once working, but the original thread on headwize, as the whole forum, is currently under maintenance and in read only mode.
So, hoping I can still pose my technical question here in the meanwhile (lot of photos for a reward
)... I built a gamma1 full, tested voltages and shortcircuits as standard initial testing showed, checked for cold joints with a lens and so on, then I turned it on, connecting to USB for both power and data.
The DAC sounded very well, tested it on a pair of AKG KSC-75, just some little scratches and noise at the maximum iTunes volume, but seemed to dissipate in a few seconds at least for the most. The switch light also lit red to become green when audio was playing to blink red then green again while playing. Then I tried to move the input switch, which of course silenced the headphones, yet, and there it is the problem, when switched back to USB it barely stayed green for a few moments then turned red and no more sound from it from then, like there was no data input. I of course disconnected and reconnected the USB cable, just to be sure restarted the mac, reflowed nearly all SMD components on board, checked again for burned components or toasted smell (both none), cold joints (seems none) and wrong parts (seems none too).
I have to say that I have some experience in SMT soldering and one source of the problem MAY be that I cleaned in isopropolic alcohol spray the boards, which there MAY have been some slight residues under some chip, maybe shortcircuiting it.
I'd hope you can help me at least restrict the possible broken or malfunctioning part with your experience, I followed that schematics and tried to check or reflow anything that may be part, but before replacing al of the components I'd like to have at least a few to try first.
I repeat that voltages where, while powered from USB, perfect from both boards and when mated togheter and sadly I'm not able right now to both try to power the gamma1 from a wall plugged transformer, nor to check for any other input (optical or coaxial), the latter I may be able to try tomorrow.
As this little jewel is surely form a very good pair with my PPAv2 I hope to get it back working again very soon... can't actually wait for it to blossom to a full gamma2 too eh eh...
Thanks anyway for any help, sorry again for not posting in the most right topic, yet can't find or use one more specific.
Ric