Amp problem - I'm stumped . . .

CaughtLikeFire

CaughtLikeFire

New member
so my Laney LC15 suddenly decided that it doesn't want to power up. LED doesn't light up, no juice.

fuses are good and the amp worked great 3 days ago. No weird noises, drops in volume, anything since I replaced the OT (about a week after I bought it). the amp hasn't been dropped or banged around and it hasn't been touched since I last used it 3 days ago.

anybody know where I should start troubleshooting?
 
Re: Amp problem - I'm stumped . . .

Sounds like the power supply has no power.

Start with the power cord, then the mains switch, then the rectifier...ect....
 
Re: Amp problem - I'm stumped . . .

I don't know specifically about that Laney, but many amps have internal fuses in addition to the fuses visible on the panel (although since you've been inside, I'd imagine you're well aware of that).
A few other things you can try: leave it on for a half hour or so, and then feel the power transfrmr... if it's cold, it could either be bad or somehow AC isn't getting to it (maybe a fuse looks good, but really isn't).
Measure AC volts at the power switch when it's on... you could have a bad power cord, or a bad power switch.
 
Re: Amp problem - I'm stumped . . .

The power on LEDs in that amp are on the filiment supply and are before the inline fuses that protect the filiments. If your mains fuse (500 mA) is not blown, I would suspect a loose connection, either at the primary, secondary filiment supply or at the mains switch. This should be easy to chase down...remember, the problem is an AC one and your meter needs to be set for this. Don't bother probing anything DC, the problem isn't there.
 
Re: Amp problem - I'm stumped . . .

glassman said:
The power on LEDs in that amp are on the filiment supply and are before the inline fuses that protect the filiments. If your mains fuse (500 mA) is not blown, I would suspect a loose connection, either at the primary, secondary filiment supply or at the mains switch. This should be easy to chase down...remember, the problem is an AC one and your meter needs to be set for this. Don't bother probing anything DC, the problem isn't there.
Click to expand...

GM, thanks again for your help :usa2:

I'll pull the chassis tomorrow after work, get out the multimeter, and see what I can find.
 
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