Please help me repair my Marantz 2230!

[justinfranx]

I found r770 but am unsure of how to test it

J753 0.6v
J754 2v

 

[petehall347]

see if you can voltages both sides of r770 ... dont worry which are which i can work that out .

 

[justinfranx]

62.1v and 62.6v

 

[petehall347]

see if you can get voltages both sides of diode h758

 

[Beau Geste]

http://audiokarma.org/forums/index.php?threads/received-my-fully-restored-marantz-2230-wow.168873/ - http://audiokarma.org/forums/index....-can-someone-help-please-marantz-2230.515109/ There are many thread on Karma about your receiver .I hope help .Sorry iI have not any experience with the Marantz..

 

[justinfranx]

I get 2.5v on both sides of h758

 

[petehall347]

voltages r758 r759 ?

 

[justinfranx]

R758 39.5v and 63v
R759 2.5v and 39.3v

 

[Steven Tate]

I am loving this!

 

[justinfranx]

Me too Steven, I am beyond appreciative for all the help and support so far!

 

[petehall347]

are you sure c757 is in the right way round ? + goes to r764 ..
also unplug the unit from the wall ..set your meter on 10k ohms and check ohms right across r759 .. it should read 3.3k ...3300 ohms ..

 

[petehall347]

I am loving this!

me too ...just need to figure out whats happening to 28v thats not there ... its only 2v ..should be 30v ..

 

[justinfranx]

My meter doesn't have a 10k ohm setting. I used the 20k ohm setting and got a reading of 0.

C757 looks right to me according to the + on the board.

 

[petehall347]

well this is strange .. it looks like its marked c757 but is actually c754 ... negative to r757 2.2k ..
as for the meter reading i am not sure why its reading 0 .. it would be best to unsolder one side and measure its ohms again ..the circuit is maybe affecting the reading ..


c757 is 22uf ..c754 is 47uf

 

[Steven Tate]

If you want a little bit better look at the area around the cap marked C757, there are a couple of pics in this old thread of mine, post #12
http://audiokarma.org/forums/index.php?threads/first-2230-rebuild.722936/

 

[justinfranx]

I will unsolder one side and test r759 again in a bit.

When I did the recap I pulled and replaced one cap at a time, to insure that I put the right caps in the right places.

The spot that is marked c757 on the board is currently a 22uf, c754 is 47uf and there is a matching one right next to it.

 

[justinfranx]

Your numbers are so clear Steve! I can barely make most of mine out haha. Thanks for the help!

 

[justinfranx]

I unsoldered one side of what I believe is r759 (kind of hard with the smudged screenprint numbers), I used the 20k ohm setting and got a reading of 3.75 ohms.

 

[petehall347]

am guessing that is really 3.75 k ohms ..3750 ohms .. could be meter error .. i dont think this is the reason for the massive voltage drop ...
i dont suppose you touched r760 at all ?

 

[justinfranx]

I have not adjusted r760, when I caused all this mess I was trying to get a reading to see if I needed to make an adjustment.

I had been testing the amp extensively after each board was recapped and it seemed to be working and sounding great until I caused the short.