[HR][/HR]About a year ago I spotted a Craigslist ad for 2 MCS 3275's and 1 MCS 3125
non working for $100. Driving the round trip of 100 miles, I ended up with
all 3.
Cleaning the Dolby switch on one of the 3275's I sold it on Ebay for $300
plus shipping. The other 3275 was missing a couple of knobs and the Alps
volume pot was trashed. I decided to part out this unit and selling parts
to date have realized $175 and made more than a dozen 3275 owners very happy.
With my Guru electronics tech and Master solderer brother in law I decided
to restore the MCS 3125.
The 3125 was locked in protection, the digital FM readout was not working.
On internal exam the first thing noticed was the filter caps were leaking.
We replaced these with 4 Cornell Dubilier 10,000 uf 105 C capacitors.
With the amp still locked in protection we noticed what appeared to be a replaced
capacitor in the protection circuit board. It was brown and all the others were blue.
On closer inspection we discovered it was originally blue and after replacing the amp works.
In order to repair the digital FM readout after a lot of testing we discovered
that the Integrated circuit was bad. My brother in law removed it and installed
a 40 pin IC socket, popped in a new IC and now the readout works perfect.
We had a lot of problems with the push buttons on the unit, so I was able to
un hook the equalizer circuit board from the faceplate, flip it over and now
had access to all of the switches. I took apart all the switches, cleaned them with de-oxit and reassembled them.
(If you attempt this, be very careful with the miniature springs as they have a tendency during reassembly to shoot all over the room)
A little touch up and spray painting the case cover my 3125 is now near mint
and working perfectly.
non working for $100. Driving the round trip of 100 miles, I ended up with
all 3.
Cleaning the Dolby switch on one of the 3275's I sold it on Ebay for $300
plus shipping. The other 3275 was missing a couple of knobs and the Alps
volume pot was trashed. I decided to part out this unit and selling parts
to date have realized $175 and made more than a dozen 3275 owners very happy.
With my Guru electronics tech and Master solderer brother in law I decided
to restore the MCS 3125.
The 3125 was locked in protection, the digital FM readout was not working.
On internal exam the first thing noticed was the filter caps were leaking.
We replaced these with 4 Cornell Dubilier 10,000 uf 105 C capacitors.
With the amp still locked in protection we noticed what appeared to be a replaced
capacitor in the protection circuit board. It was brown and all the others were blue.
On closer inspection we discovered it was originally blue and after replacing the amp works.
In order to repair the digital FM readout after a lot of testing we discovered
that the Integrated circuit was bad. My brother in law removed it and installed
a 40 pin IC socket, popped in a new IC and now the readout works perfect.
We had a lot of problems with the push buttons on the unit, so I was able to
un hook the equalizer circuit board from the faceplate, flip it over and now
had access to all of the switches. I took apart all the switches, cleaned them with de-oxit and reassembled them.
(If you attempt this, be very careful with the miniature springs as they have a tendency during reassembly to shoot all over the room)
A little touch up and spray painting the case cover my 3125 is now near mint
and working perfectly.
