Can newbie repair an Amplifier

topdecko

hi all, have a yamaha DSP-AX757SE that i got for a bargain.

was working great for 8 months and then something crackled and popped one night. Was plugged in and one of the resistors fried.

I have taken top off and can see evidence fire near where the power cord goes into back of the machine. Looks like one of the components fried. Can i replace this myself or have to get shop to do it. Just don't want to chuck a machine that was great when one small part gone.

thanks for any advice. - have no experience with electronics apart from messing round with computers - replace SSID/ update RAM etc. nothing involving boards etc.

Danzy

Know a lad in Sligo fixes them. Rumble studios.

He told me about a fellow who tried to fix one himself. Miracle he didn't fry himself.

WebDevSean

The short answer is yes… with an *

*may cause shock, serious injury or death.

The longer answer is - with the right tools.

As a minimum:

1. a multi meter
2. soldering iron/hot air station
3. flux
4. solder wick/solder sucker
5. solder
6. tweezers
7. replacement part(s)

A mag glass or microscope would usually help too but looks like you might not need it based on the pic.

Two Words Of Caution! - Capacitors can kill! They can store serious amounts of electricity and should be discharged first and amps usually have serious capacitors. Also Electrolytic Capacitors like to pop when heated so be careful.

I'd bite the bullet and pay someone the circa €50 plus parts if you have no experience with micro electronics, but tis up to you. Just remember, the resistor may not have been the original issue either, it may just be the result of another problem.

I have a little experience here: see pic