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
(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
Something is likely shorted to the case.
Have fun finding it since taking the boards out is going to clear the short..
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...
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.
Check all the pins where the cables are attached. May be bent into a short somewhere if there was tugging at them.
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.
I'm looking at the tpa3118 as replacement.
So its just a power supply thing to deal with.
Kinda want to keep the original power section? Loved how it sounded before it went sideways. Thank you for the suggestion!
Thanks! Yeah, I checked the transistors, and some went bad... Have spares on hand, and they test fine!
Thanks. Thats what I was thinking also. Just worried I may have more than one "issue"