Another "no sound after boxing up the circuit" thread

[Widows]

Hi folks,

I recently built a Rat on a GGG board (see schem here: http://www.generalguitargadgets.com/pdf/ggg_rodent_sc.pdf?phpMyAdmin=78482479fd7e7fc3768044a841b3e85a),
I know the circuit works fine as i tested it hooked up to a breakout box to make sure it was working before boxing it up.

I've followed the wiring diagram (http://www.generalguitargadgets.com/pdf/ggg_rodent_lo.pdf?phpMyAdmin=78482479fd7e7fc3768044a841b3e85a) and as far as I can see everything is wired correctly although I must be doing something wrong, obviously, or it'd be working.

Clean sound when bypassed, click the switch and LED lights up but no sound.

As I mentioned before, I've made sure the board works beforehand. Bearing in mind the info above, what could I be missing here??

Can't provide any pics right now as my camera is dead. I should have it charged by morning though.

Any advice would be a great help. Cheers

[Ice-9]

You probs just have a shorting wire or break in a wire after stuffing into the enclosure. If it was working fine before boxing then just check for that.

[LucifersTrip]

I know the circuit works fine as i tested it hooked up to a breakout box to make sure it was working before boxing it up.

The trick is to take voltages when working so if it ever fails, you can get back to where it was much easier.

regardless, you need to check voltages now...

[Mark Hammer]

The debugging page is a little generic.  I wonder if it might be useful to have a special sticky for "used to work but doesn't work when boxed up".  This particular subset of troubleshooting tips and stereotypic causes of trouble is useful on its own.

1) Things shorting out against: exposed leads from vertically-mounted resistors, solder lugs or chassis of nearby pots or toggles, lugs of open phone jacks.

2) Wires that get fractured during the struggle to seat components into the chassis, especially when tightening nuts on the outside.

3) Inadvertently melting the grease inside the stompswitch with too much heat during soldering, causing it to flow and coat the cotacts inside.

4) Miswired input jacks or external power jacks that result in no power getting applied to the board or the battery remaining on even after you unplug.

[Widows]

Thanks folks. Yeah I woke up this morning n instantly thought "best check the top of the pots aren't shorting against the inside of the enclosure. Pulled em out, ran a length of insulation tape along the bottom of the pot holes, reassembled n hey presto.

This is why you don't debug after midnight, people ;-)

One, two, three....Hurrr Derrrrrrrrr!

Here's a pic of the finished beast, ooh she's sexy: http://imagizer.imageshack.us/v2/640x480q90/199/oa64.jpg
The guy on the pedal is Fabio Testi, apparently.

[duck_arse]

add to mark's list

5) are the led leads completely insulated?

6) have you used a metal dc jack?

wasn't fabio "I can't believe it's not butter"? (don't add that to the list.)