Then it's almost certainly the headphone switches causing the problem. This is hardly the first time.
Try shooting some cleaner in there, deOxit or alcohol. Nothing that would gunk it up, though.
The switches are inside, and are an integral part of, the headphone jack. This is a common arrangement.
You cannot open the jack up, it's sealed. Either shoot in some cleaner, or replace it if possible.
You cannot open the jack up, it's sealed. Either shoot in some cleaner, or replace it if possible.
If there's no distortion in the headphones, and both channels distort on the speakers, and the distortion goes down with level, that's a clear indication it's the speakers.
Try to get nother pair of speakers to make sure.
Jan
Try to get nother pair of speakers to make sure.
Jan
Yup, that's the only way into there. Give it a 1 second spray, and then plug in the phones a few times. Then test the speakers.
Repeat if necessary, the cleaner has to migrate around into the switch contacts and may take a few tries to work.
I've tested on two sets of speakers and results are the same. It's only the positive right amp terminal.
Ordering some electrical contact cleaner now and will try tomorrow! Hopefully it works.
Ordering some electrical contact cleaner now and will try tomorrow! Hopefully it works.
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So I did a spray with the contact cleaner...
Headphones now sound distorted, the bad terminal sounds even worse, and the other terminals now intermittently distort.
Any ideas?
Headphones now sound distorted, the bad terminal sounds even worse, and the other terminals now intermittently distort.
Any ideas?
Interesting note, now when I play audio through my phone using the bad terminals, playback randomly stops? Audio doesn't just cut out but the actual song playing pauses on my phone.
Nope. I did try powering the speaker by touching the wire to the point of the bad terminal on the PCB though, but there was still distortion.
It's still dirty, you just moved the dirt around. Spray it some more. Did you plug and unplug the phones
several times to give the solvent a chance to get into the switch contacts? That's necessary to do.
But the headphone connections are all soldered, so that's not from dirt.
I've now sprayed the jack several times, each time inserting the headphone jack several times. No improvement yet, how much can I spray this without harming it?
I don't see how it can get any worse that it already is.
Try spraying the phones' headphone plug near the end of the plug, and then insert and twist it several times.
Of course, if the jack is badly corroded, the cleaning won't help.
Try spraying the phones' headphone plug near the end of the plug, and then insert and twist it several times.
Of course, if the jack is badly corroded, the cleaning won't help.
Have tried all the possible ways of cleaning out the headphone jack but unfortunately nothing has worked. What's my best course of action now?
I'd be happy trying this but may need some help finding the correct places on the pcb.
Might be tricky finding the right points to connect on that small board. The documentation is poor on this.
If you can find the amplifier output inductors elsewhere in the amp, for each channel connect its output directly to the red speaker terminal with a reasonable wire, say #20.
If you can find the amplifier output inductors elsewhere in the amp, for each channel connect its output directly to the red speaker terminal with a reasonable wire, say #20.
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https://shop.rall-online.net/Switching-1/4-Stereo-Jack-DPDT
With some effort tracing the circuit, you can solder the 7 wires of the ribbon cable directly to the 9-pin switching headphone jack.