JCM 800 Died HELP!!!

[Mxzx]

Was playing it yesterday and it sounded better than ever, today, no lights or anything. It is a channel switching amp, and nothing on the front works and no tube glowing in back. The fuses are good, and the wall outlet has power.

Any idea where to start?

TIA

 

[stryker59]

sounds like somethin fried on the board, see if the board smells like smoke and check all the components to see if anything is fried....

 

[Adwex]

Obviously an issue in the power supply section. Are you 100% sure of that fuse? Hope it's not a bad power transformer. Could be the power switch, the fuse holder, or something simple. Follow the incoming power with a voltmeter...
are you getting power to the on/off switch...
is power coming out of the switch...
is power getting to the power transformer...
is power getting to the standby switch...
is power coming out of the standby switch...
etc.

 

[Mxzx]

Yeah, I am going to get in there with a meter and see what's going on!

 

[Mxzx]

Turns out it was the 3 amp fuse, looked good but no continuity.

 

[stryker59]

Turns out it was the 3 amp fuse, looked good but no continuity.

cool!!! glad it wasnt anything serious! so all is well?

 

[bigragu63]

In case you replace the fuse and it blows again... My JCM800 was blowing the 3 amp fuse before, and it ended up being a bad power tube.

Good luck!