Marantz Model 240 Amp

[Shaun b]

I picked up a Marantz Model 240 last week. It blows the main fuse as soon as it is powered on. I have replaced the OT;s already but I get varying voltages when testing them. Does anyone know what they should be or have a copy of the service manuel where the photos are not blacked out ? All the copies I found were unreadable. Thanks

 

[airtime]

Try HifiEngine.com

https://www.hifiengine.com/manual_library/marantz/240.shtml

Did I read that right that you replaced the output transformer? Or is that output transistors?

 

[quadmatrix82]

The filter caps and rectifiers on these are known to fail highly recommend you replace them..

 

[Shaun b]

Try HifiEngine.com

https://www.hifiengine.com/manual_library/marantz/240.shtml

Did I read that right that you replaced the output transformer? Or is that output transistors?

transistors. auto-correct my bad

 

[dr*audio]

Test the transistors. Start from the output and work back toward the input until you stop finding bad transistors. Then test the bias transistors.

 

[rickl]

I don't have the same experience as most here but my 250 had most of the transistors blown. Outputs, drivers, and more.

If possible, I'd test all of the transistors. Like Dr Audio suggests, start at the outputs and work back.