mb quart 1500

[timwebb]

i have one of these and it plays very faintly. everything seems to be in order. what should i be looking for?

 

[Perry Babin]

Post a photo of the board.

 

[timwebb]

....

 

[Perry Babin]

On the output terminals of the output filter inductor, do you see a larger signal than you do at the speaker terminals?

Is the relay engaging?

 

[timwebb]

yes the signal at the filter inductor is good and larger. the signal at the speaker is very distorted square wave.

 

[Perry Babin]

Is the relay engaging?

 

[timwebb]

yes the relay is engaging. the amp has very little output.

 

[Perry Babin]

If there is good signal on the output filter inductor before the relay but not after the relay and it's engaging, the relay is likely defective or could have a bad solder connection.

 

[timwebb]

ok. breaking it down now.

 

[timwebb]

yes. the relay and the diode had bad joints. plays fine now. thank u mr perry!