The PCB wouldnt have been touched....... the chassis wouldnt even have to come out. But i get what you're saying.
30% off all Honey Amp kits, check it out at https://store.ssguitar.com !
This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.
Show posts MenuQuote from: DrGonz78 on September 10, 2016, 03:39:18 PMfixed it! After more inspecting, i found a loose wire. Resoldered and its up and running! Thanks
Yeah don't replace those Output transistors now. Maybe later if they prove to be faulty but only then. You have already narrowed the problem to being on the preamp side of the amp. Perhaps there is a problem on the output side too, but there is DEFINITELY a problem that needs to be fixed on the preamp. Signal tracing and voltage readings will be your best friend right now. Hey you might end up fixing the preamp to find the amp working normal again. Don't shot gun this thing seriously.
Quote from: J M Fahey on September 10, 2016, 11:06:08 AMNothing on the PCB will be touched...the output transistors 2sd425s located on the bottom outside of the chassis, simply unscrew pull out and replace. I AM recieving very low audio output from the speakers when i have my phone plugged in, but there does not seem to be any amplification. This is the one "shotgun" troubleshooting step, that should not harm the amp. No soldering, or tampering with anything on the PCB. Identify the base of the transistor with a DMM and install. Let me know if im incorrect?QuoteSo now i get an initial surgenof volume, then it drops down to faint again. Transistors?Quotewhat makes you think you have bad transistors?
No sound from secondary Amp when running from jc120 line out to input jack. I think im going to purchase some new transistors.
What tests did you do to reach that conclusion?
I suggest you do not start "shotgunning", meaning replacing parts at random with no clue, hoping to solve the problem; all you´ll get is messing/destroying the PCB from repeated soldering/pulling/resoldering ... and then you´ll end with a 60 lb doorstop or night table.
Can you recognize and find physical parts based on a schematic?
Can you measure and post voltages and follow PCB traces?
You will need those skills to start troubleshooting, only valid repair path.
Plain guessing (gambling) is disappointing, to say the least, and in that case you will be better off sending it to some experienced Tech.
Quote from: phatt on September 10, 2016, 03:30:03 AM
Ok good you have a *line out*
If you have another amplifier then Use the line out and take the signal to another amplifier.
If the signal is strong then you know that the preamp section is working and that helps to narrow down the problem.
Also there might be a broken solder pad and something has lost contact.
A good thump with your fist might even get it working again, that tells you the problem is a mechanical issue and then you unplug and go on a big search of the circuit to find the break.
Phil.