Vox AC30CC2 strange behavior

[rockaffe]

Good evening everyone, I state that I am a rookie in the field and I would like to ask your opinion on a strange behavior of my Vox AC30CC2.
I replaced the filter capacitors today and after reassembling everything and turning on the amplifier the output signal was very very low.
At one point I gave a particularly strong strum on the strings, and the signal became perfect.
What could have caused this behavior?
Thank you very much for any replies.

Cristian

[loudthud]

Check any Effects loop by inserting a cable from Send to Receive.

[Jon Snell]

A bad connection somewhere. Check the wire dressing and make sure everything is looking good as it was.
There are a whole host of interconnectors on these newer Korg amplifiers. Make sure they are OK.

[rockaffe]

Thank you!

[Mick Bailey]

Chopsticking the amp while playing through it may reveal where the fault lies. I use a melamine chopstick with a sharpened point, but any non-conductive material that's long enough to maintain a safe distance should be fine. Sometimes gentle pressure on a component, connector, wiring or circuit board is all that's needed.

[rockaffe]

Chopsticking the amp while playing through it may reveal where the fault lies. I use a melamine chopstick with a sharpened point, but any non-conductive material that's long enough to maintain a safe distance should be fine. Sometimes gentle pressure on a component, connector, wiring or circuit board is all that's needed.

I just remembered that in the past (so before replacing the capacitors) the amp had had the same behavior. Then as now it had been shut down for about two years. I don't know if this could be part of the cause. Anyway, after that hard pick, the amp worked perfectly.

[The Dude]

Do check/clean the insert/effx jacks as loudthud pointed out in post #2. They are often the cause of this symptom.

[Pedro Vecino]

Also inspect the loop bypass slide switch.

[rockaffe]

Hey, thanks again for your replies.
I did some test on your advice and here is the results:

- Nothing happens if I insert a cable on send/return
- Sound disappear if I touch the loop bypass switch (even after the amp works correctly)

Btw the amp stays at very low volume for a couple of minutes and then goes to normal working state.
It is as if something inhibited the start of the power section and then suddenly disappeared.

[Enzo]

So clean that switch.