Directed 1100 D

[mike49504]

I recieved this amp in for repair. The amp keeps clicking from on to protection mode.

I checked the outputs in circuit all seem to test fine power supply fets also seem to test ok.

Wondering where i begin checking now?

[Perry Babin]

Do you ever see oscillation on the center legs of any output? Set the scope to 50v/div (5v/div with your scope?).

[mike49504]

50 volts/div and do i set the scope to us or ms?

[Perry Babin]

The timebase setting isn't really important at this point. If you set it to ~2mS and it's oscillating, you'll see two horizontal line with 'haze' between them. If you set it to 5uS, you'll see a square wave if it's oscillating and the scope locks on it.

[mike49504]

I dont have 50 volts/div highest setting i have is 20/volts div

[mike49504]

Ok i set my scope forst to 20volts/div then 10volts/div the 5 volts/div

Do not see any oscillation on any of the center legs of outputs.

I did notice R501 gets red hot to the point its almost glowing red though

[Perry Babin]

Do you have significant DC on any of the center legs?

[mike49504]

with black probe on non bridging speaker terminal i have -68.1 volts on all the center legs of the outputs

[Perry Babin]

On ALL of the outputs or only on half of them?

[mike49504]

ON all of them