I thought I'd bring some closure to this thread.

I've been using the amp for over a month now with no issues. I contacted the Orange rep and he shipped me a replacement multi-effect module covered by warranty. I popped that in and I'm back to 100%.

Thanks everyone for troubleshooting and the help understanding transformers.

Okay. I'm gonna leave it running for an hour tonight, then open it up and check for heat. Anything else I should look for while its popped open?

Okay; Painstakingly transferred the 3 pole connector. Plugged in and....

It works!

The Multieffects Unit doesn't seem to be functioning properly, I think its stuck making a mild tremolo, but the Tuner is still in good shape.

I'm very happy. Thank you all for the lesson.

Okay. The Radio Shack Manager tried to sell me an 18v wall wart... I went over to Fry's Electronics and bought a proper replacement: http://www.frys.com/product/6148309?source=googleps&gclid=CJiZ0-nJk70CFYZAMgodCC8AKA

The Primary Stage reads 34.5ohms on the input. It looks ready to go.

Is there anything I should check before I wire this up? Is there a high risk that the fuse will blow in the new one?

Excellent. Thank you very much.

I have an Open Circuit at the Primary Stage, and very low resistance (~3ohms) between the wires at the Secondary Stage.

The Transformer Reads:

I/P: AC115V 50/60hz
O/P: AC18V*2/1A

Thermal Cuttoffs 130*C/2A

I called Radioshack, they have a AC120V-AC18V for about $20, but it was only rated at 1 Amp. About $22. My least favorite place to buy parts, but I'd like to spend my time this weekend getting the amp running.

Any tips on where to find or order a replacement?

Quote from: Roly on March 14, 2014, 08:27:19 AM
18VAC each side of the centre tap less a diode drop of around 0.7V is 18 - 0.7 = 17.3.  When rectified this will give an unloaded voltage of root(2) times, or 17.3 * 1.414 = 24.5VDC (roughly, a bit less depending on the idle current drawn by the amp).

Wow. I didn't realize that rectification increased voltage. Makes sense though. I'm not very mathematically inclined; how did you get 1.414?

Quote from: Roly on March 14, 2014, 08:27:19 AMThese two observations appear to be contradictory.

I was referring to the switch. When the Switch is on I read 19ohms resistance. Maybe that's enough to drop the 120v down to 119.3v that I'm reading at the switch terminal. Either way, it doesn't seem to be a problem. - I'm sorry for the confusion.

I'm really struggling to understand what I should be checking to determine if I need to replace the transformer.

1.) How can I check the wires for continuity? - One side of each wire terminates inside the transformer which is wrapped in tape.

2.)What resistances should I be reading between the wires?

Okay, I'm certain the mains switch is fine. I've also tried 2 other power plugs.

When it's plugged in and off, I read 0 Volts (negative clipped to chassis ground) on the brown wire terminal, when it's plugged in and on, I read 119.3v.

When unplugged and off I read an infinite resistance, and when unplugged and switched on I read 19ohms resistance.

Sorry about the crappy picture; the 2 unplugged connectors go to the speaker, they are still zip tied to the other wires but I should have moved them out of the way.

However: I measure Infinite Resistance (at the 2mega-ohm setting) between the positive and negative wire of the transformers input. Do you call the Transformers Input the Primary and the Transformers Output the Secondary? Do I have a bad 'primary'?

Okay! Interesting discovery: No Voltage at the Transformers Output.







There are 3 wires on the connector, 2 blue AC wires and 1 black Ground. I get 0v AC whether the connector is plugged into the board or disconnected or whether the power switch is on or off.

Roly,

The Switch and the Fuse have both been checked with a multimeter, and they appear to be fine.

I've also tested the Diodes in the Rectifier section on the Diode Test setting of the Multimeter, and I couldn't find any problems. - However I did this while the amp was unplugged.

I understand you right, I should have the amp plugged in and test that the Transformer Output is around AC18v as the sticker on it says it should be. Then I should check the Output of the Rectifier, so see if I get the same Voltage, minus several volts to account for the voltage drop across the diodes; I'm gonna guess I'm looking for about 15v?

I'll look around for some schematics, but I doubt it will be an easy find. The only one I can find is for the Crush 15r which has been posted here before.

I had the guitar plugged in, on its stand. The amp was set to a pretty low-medium volume. Left it for about 5 minutes, came back thinking I must have accidentally turned it off.

Amp died on me while I was in the bathroom. No LED Power, no Sound.

Outlet - Check
Cable - Check
Fuse - Check
I/O Switch - Check
Wires - Check
Connectors - Check

Diodes Near Rectifier - Check

What should I check next?

I can bring some close to this thread.

I had the same problem. Turns out you have to remove the handle.

Thanks J M Fahey.