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Marantz 2220B

S

speakerguy72

New Member
:music:I juts purchased my first (of many i hope) Marantz receiver and its in very nice condition cosmetically but im having a problem with the FM. It doesnt seem to receive FM Stereo. It brings in stations very well and the stereo light does not come on. It flickered for a micro second one time so i know the light does work. . Ive got pretty good ears and am very sure it is not in stereo by listening to it. I took it to a local repair shop and they want Nearly $30 to just diagnose what the problem is. I was wondering if there is anything i can check or adjust before i spend more than the receiver is probably worth to get it fixed. I cleaned all the pots and buttons as per advice from everyone here and everything else seems to work very nicely. Thank you in advance for any help!
 
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The Stereo indicator is also used to tell you the unit is in stereo mode (as opposed to mono). Does the Stereo indicator illuminate if you set the function switch to Aux and have the mono switch out (not depressed)? If not, it may be that the lamp is burned out.
 
$ 30.00 not a bad price for a quote ...
Remember you are paying for what they know not what they do .

Try cleaning it and moving the antenna around some first .

Good luck


Barney
 
Im just afraid they are going to tell me it needs $100 worth of work in which case ill have nearly $200 in to it. which is the very high end of what its worth. If careful i could have picked up a 2230 of 2220 w wood for that. I make stupid mistakes all the time lol. I did check to see that the Stereo light comes on in Aux. mode and it does. In fact it sounds very good with some old erasure tunes. Thanks everyone!:beerchug:
 
speakerguy72 said:
Im just afraid they are going to tell me it needs $100 worth of work in which case ill have nearly $200 in to it. which is the very high end of what its worth. If careful i could have picked up a 2230 of 2220 w wood for that. I make stupid mistakes all the time lol. I did check to see that the Stereo light comes on in Aux. mode and it does. In fact it sounds very good with some old erasure tunes. Thanks everyone!:beerchug:
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When you're in this business of picking up units here and there as you come across them, some choices will pan out like gangbusters and others will just be so-so. Any Marantz receiver is worth the gamble, most any of us veterans would probably have not resisted that purchase either.

Anyway, get yourself a schematic and start poking around. There are some techs on this board that might point you in the right direction. Sometimes specific models have recurring problems and are easily pinpointed. I fixed a problem similar to yours on another unit by checking the transistors in the FM IF section.

If you can't fix it, no worries. In 2 or 3 years when FM is dead, you won't care.
 
Make sure you're using a good extrernal antennae and not in the basement!! :nono:
 
**If you can't fix it, no worries. In 2 or 3 years when FM is dead, you won't care.**


Sorry, FM died when all of the big companies took over and jocks could no longer play what they wanted.

I worked at a small AM/FM station from 1984-1986 and it was FUN. There is no way I would work in radio today.

dgarlits
KPSO AM 1260 - FM 106.3
 
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Open the hood of your receiver.
Can you tell us what are the part numbers of all the IC on the tuner board?

I will try to post a schematic and adjustment instructions for similar tuner section from others Marantz receiver or tuner. I don't have the schematic for your particular receiver, but you should know that many boards are common with others members of the Marantz family.
 
Your receiver use the HA1156 MPX chip.

You will find in the middle of the receiver, close to front area, the multiplex (stereo) board. This is the P300 board, as you can see in the attached file.

You will need to readjust the R304 trim pot, identified as 19kHz or VCO or simply R304.

Before doing any change in the trim pot, mark the actual position of the pot. Sharp colour nail varnish applied with sharp toothpick (just a small dot) is very useful for this because it dries quickly. With a mark, you can put the trim pot to his initial position if the adjustment does nothing.

Select a strong radio station, that you should receive in stereo. If you adjust R304, you should be able to fix your problem. Usually it works.

Once you have a stereo signal, you can repeat the procedure with a weaker station.

Don't touch R303. This one is for the separation adjustment (leakage from left to right and from right to left).
 

Attachments

Sorry i havent been on here (or my computer for that matter) thank you for the help. Im of tomorow and ill give this a try....Thank you again ill be excited if it works.
:music:
 
Thanks a bunch !

ecluser said:
Your receiver use the HA1156 MPX chip.

You will find in the middle of the receiver, close to front area, the multiplex (stereo) board. This is the P300 board, as you can see in the attached file.

You will need to readjust the R304 trim pot, identified as 19kHz or VCO or simply R304.

Before doing any change in the trim pot, mark the actual position of the pot. Sharp colour nail varnish applied with sharp toothpick (just a small dot) is very useful for this because it dries quickly. With a mark, you can put the trim pot to his initial position if the adjustment does nothing.

Select a strong radio station, that you should receive in stereo. If you adjust R304, you should be able to fix your problem. Usually it works.

Once you have a stereo signal, you can repeat the procedure with a weaker station.

Don't touch R303. This one is for the separation adjustment (leakage from left to right and from right to left).
Click to expand...

I remembered this post and finally got my 2220B off the shelf to check it. I bought the unit new in 1975, my son took it to college in 1985 and he used it several years. Still sounds great but the FM was a little weak. Did the adjustment on R304 and presto, FM locks in perfectly strong now. It is destined to go in my grandson's bedroom. :music:
 
Very nice... from Dad to Son to Grandson.....you got to love it....


jk


Hepcat said:
I remembered this post and finally got my 2220B off the shelf to check it. I bought the unit new in 1975, my son took it to college in 1985 and he used it several years. Still sounds great but the FM was a little weak. Did the adjustment on R304 and presto, FM locks in perfectly strong now. It is destined to go in my grandson's bedroom. :music:
Click to expand...
 
Timely thread! I have two 2220B "parts machines" that I am trying to cobble together to make one and the FM stereo is a problem.
 
SoCal Sam said:
Timely thread! I have two 2220B "parts machines" that I am trying to cobble together to make one and the FM stereo is a problem.
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I dunno, I have 2220 here that I should part out, no FM at all, major hum in one channel, sorry shape overall, but I'm still gonna fix it. After it's done, I'll post a thread about what was wrong and what I did to rectify the problems.
 
tarior said:
I dunno, I have 2220 here that I should part out, no FM at all, major hum in one channel, sorry shape overall, but I'm still gonna fix it. After it's done, I'll post a thread about what was wrong and what I did to rectify the problems.
Click to expand...

If you have a HA1156 IC in your receiver, you must be sure the current from the stereo lamp is not too large, or this will kill that MPX demodulator. Consult the datasheet here

http://www.datasheetarchive.com/preview/1521197.html
 
ecluser said:
If you have a HA1156 IC in your receiver, you must be sure the current from the stereo lamp is not too large, or this will kill that MPX demodulator. Consult the datasheet here

http://www.datasheetarchive.com/preview/1521197.html
Click to expand...

Thanks for the info. I haven't even gotten the schematic and verified that the tuner is getting the proper voltage. I suspect that it isn't. This receiver is a back burner project right now.
 
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