CruzBay
Super Member
Hi folks, I'm not a component level guy yet, but I've been inside these things many times. I've also been in television engineering for some time, so it's unlikely I'll defibrillate myself by accident.
I've got an MC-250 I've had since the late 90's that's recently developed an intermittent humming in the power transformer, and it's heated up some.
I've decided to open the thing up and replace any capacitors in there that need replacing, thinking a recap will fix things.
BTW, the device still plays flawlessly, and has for 18+- years, but the transformer thing has worried me. Serial number 46L44, and I do have a service manual (DOB sent it to me after a clinic)
I'll be going off this parts list: http://www.diyaudio.com/forums/solid-state/250113-mcintosh-mc250-capacitor-replacement.html Credits go to DIYaudio.com, ahankinson
So I'll be replacing 8 caps:
C11, C12
Was: 470µF, 4V
Replacing with: Vishay 470µF 6.3V MAL202133471E3
C51, C52
Was: 100µF, 15V
Replacing with: Nichicon 100µF 25V UKZ1E101MPM
C53, C54
Was: 10µF 25V
Replacing with: Nichicon 10µF 25V UES1E100MDM1TD (Bi-Polar)
C55, C56
Was: 640µF, 25V
Replacing with: Nichicon 1000µF, 25V TVX1E102MCD (Axial)
OR: Nichicon 680µF, 35V UKL1V681MHD1TN
Anyone have another suggestion?
Should I replace the diode bridge while there? The above list seems pretty short.
Ignore this stuff and call someone who can be more comprehensive?
Thanks to everyone in advance.
Mike
I've got an MC-250 I've had since the late 90's that's recently developed an intermittent humming in the power transformer, and it's heated up some.
I've decided to open the thing up and replace any capacitors in there that need replacing, thinking a recap will fix things.
BTW, the device still plays flawlessly, and has for 18+- years, but the transformer thing has worried me. Serial number 46L44, and I do have a service manual (DOB sent it to me after a clinic)
I'll be going off this parts list: http://www.diyaudio.com/forums/solid-state/250113-mcintosh-mc250-capacitor-replacement.html Credits go to DIYaudio.com, ahankinson
So I'll be replacing 8 caps:
C11, C12
Was: 470µF, 4V
Replacing with: Vishay 470µF 6.3V MAL202133471E3
C51, C52
Was: 100µF, 15V
Replacing with: Nichicon 100µF 25V UKZ1E101MPM
C53, C54
Was: 10µF 25V
Replacing with: Nichicon 10µF 25V UES1E100MDM1TD (Bi-Polar)
C55, C56
Was: 640µF, 25V
Replacing with: Nichicon 1000µF, 25V TVX1E102MCD (Axial)
OR: Nichicon 680µF, 35V UKL1V681MHD1TN
Anyone have another suggestion?
Should I replace the diode bridge while there? The above list seems pretty short.
Ignore this stuff and call someone who can be more comprehensive?
Thanks to everyone in advance.
Mike