Aiwa MX-Z3000MK

[quiggy]

I have a problem with an amplifier, when turned on the display won't come on, the led on the volume lights up and if connected to the rest of the seperates those power on too. The amplifier also locks up, if I keep turning it on and off, the display with eventually come on by slowly brightening up but it's still locked up and only displaying what it would at the very start when it's turned on.

I applied a heat gun near some capacitors, diodes, resistors and a transistor, after heats applied the unit functions correctly unless it's left to cool down. I thought it might be a cap issue so I replaced 3 of those but the problem persists.

To me it's like something is slowly building up to the point where it's at the right value to function. Could it be the transistor?

I'll take a picture shortly.

[quiggy]

Re: Aiwa MX-Z3000MK

I changed the 2 larger capacitors and the smaller black one near the larger one.

Sorry the quality of pictures are not very good, I'm having to use another camera.

[quiggy]

Re: Aiwa MX-Z3000MK

On second thoughts the heat applied might have been coincidence, when I turn it on the display is dark but if I just leave it, it slowly lights up.

[SteveNielsen]

Re: Aiwa MX-Z3000MK

Components warm up when energized so your initial assessment is still valid. It might be easier to find with some freeze spray and approach it from the opposite direction; if a part works when heated, when cooled it would stop working. It could be a bad solder joint expanding and making contact when heated too.

[quiggy]

Re: Aiwa MX-Z3000MK

I too thought it may have been a bad joint but I couldn't find anything and I did re-do all the ones in the area I suspected it to be. I don't have any freeze spray but I'll be purchasing some as it's not the first time it would have come in handy.

Could the actual power supply be at fault? it wouldn't make sense for it to be at fault to me but I quite well be wrong, when all the separates are connected they light up, even when the amp has no display and function correctly so surely that's an indication if the power supply being perfectly fine?

What other components would work once they've heated up?

[SteveNielsen]

Re: Aiwa MX-Z3000MK

It could be anything. Any component can have temperature related problems. That's why you need the freeze spray. You were heating up the power supply section so yeah, I would suspect it's something there.

[quiggy]

Re: Aiwa MX-Z3000MK

I meant the transformer itself, it wouldn't be that would it?

[CapLeaker]

Re: Aiwa MX-Z3000MK

nope

[budm]

Re: Aiwa MX-Z3000MK

You can use canned airduster upside down as for cold spray.

[quiggy]

Re: Aiwa MX-Z3000MK

I'll pick some up today and hopefully it will help me figure out what's at fault. Should I use it while the units powered on? or turn it off, spray and turn it back on?