[Sathimas]

Hello,

I just finished my AMB M³ and have the following problem:
The DC offset between IG and OR measures ~ 5,3Volts - much to high.

I already posted this over at headwize, maybe somebody here
had a similar problem and could give me some advice what problem
to search for - a short or whatever?

Thanks
Sathimas

 

[FallenAngel]

1) Is anything getting hot?
2) Look for cold joints and/or solder bridges
3) Swap opamps from left to right and see if that moves offset
4) Visually inspect parts to make sure they are in their correct position.

You're also supposed to measure offset between OR and OG (not IG).

If none of the above, take high quality photos of the top and bottom of the board and post them.

 

[Sathimas]

1. temperatures seem ok
2. already searching but cannot find anything yet
3. Switching OPamps didn't "switch" the problem, offset stays too high on right channel
4. all parts are in their correct position

IG/OG offset to OR give the same value - 5,3Volts

 

[FallenAngel]

Photos

 

[Sathimas]

Problem is solved - I found no cold solderjoint - but there must have been one
since reflowing all joints for the right circuit helped ...

So Photos are no longer necessary