Marantz 1060 rebuild mess...

[perkri]

Hoping someone can help me solve this...

(have to start off by saying while not a complete newbe, might as well consider me one...)

I’m doing a re-cap/build of a Marantz 1060 for a friend. Had all the parts in, unit was operating beautifully!!!

When I was reassembling it - mounting transistors to heat sink, re-attaching the front and rear panels - something happened.

When I powered it up, it sounded awful. Can not for the life of me figure out what happened?

After much mucking about which caused resistor R739 to flame out, I am back at it.

It is running again, albeit noisy as heck. The noise is in headphone outlet as well as main speakers. The noise is “scuzzy”...

One thing I am curious of right off the bat is when checking RCA inputs (the centers) they are not showing an open circuit?

Please help as I really want to solve this and return the amp in working order to my friend.

Thank you!!!

P

 

[Douglas Blake]

Hoping someone can help me solve this...
I’m doing a re-cap/build of a Marantz 1060 for a friend. Had all the parts in, unit was operating beautifully!!!
When I was reassembling it - mounting transistors to heat sink, re-attaching the front and rear panels - something happened.
When I powered it up, it sounded awful. Can not for the life of me figure out what happened?

Something is likely shorted to the case.
Have fun finding it since taking the boards out is going to clear the short..

 

[perkri]

Thanks! Yeah, thats what I thought. There was some "tugging" on the cables as I was reassembling. I have prepared myself for a slow and somewhat tedious process...

 

[parabolic]

Check the output transistors (lateral mosfets) - they are static sensitive. I rebuilt a 1060 a few weeks back with success - but I´ve managed to wreck mosfets in the past with improper probing and/or handling.

 

[korpberget]

Check all the pins where the cables are attached. May be bent into a short somewhere if there was tugging at them.

 

[jfetter]

I have one too but rather than repairing the power section, have pulled it all out.
I'm looking at the tpa3118 as replacement.
So its just a power supply thing to deal with.

 

[perkri]

Kinda want to keep the original power section? Loved how it sounded before it went sideways. Thank you for the suggestion!

 

[perkri]

Check the output transistors (lateral mosfets) - they are static sensitive. I rebuilt a 1060 a few weeks back with success - but I´ve managed to wreck mosfets in the past with improper probing and/or handling.

Thanks! Yeah, I checked the transistors, and some went bad... Have spares on hand, and they test fine!

 

[perkri]

Check all the pins where the cables are attached. May be bent into a short somewhere if there was tugging at them.

Thanks. Thats what I was thinking also. Just worried I may have more than one "issue"