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Hantarex MTC 9000 width problem
CHRIS-F:
Hi,
I removed the old cap, there doesn't seem to be any polarised markings on it. does the NP mean Non Polarised? it does seem to be faulty though as my cheapo transistor tester says its a 842 pico farad cap instead of 4.7uf. what does that marking on the pcb mean I've never seen that type of symbol before, i'm guessing I can't use the 4.7uf cap i bought to replace it as that is a polarized cap.
Thanks again,
Chris.
grantspain:
np is bipolar cap
CHRIS-F:
Hi, just wanted to double check, I have both types of caps bipolar polarised, the old one was a non polarised, but just wondering why the print screen has that big thick line doesn't that denote the negative side? And the MTC 9000 manual shows the top being positive, is there a reason a non polarised cap was used here? Could that be why it's failed and bulged? I know my chassis is a clone and the print screen could be wrong etc, just want to make sure.
Regards,
Chris.
grantspain:
no idea, it just the way they did it- they were always fitted bipolar caps and later were fitted with polypropelene caps. I have worked on hundreds of the 9000 chassis and they have always been like that
they fail because they fail, just a common fault - thats why later models had the polypropelene caps fitted and they never fail. You should get a fair few years of operation with a standard bipolar cap so don't worry too much
CHRIS-F:
--- Quote from: grantspain on July 01, 2022, 04:54:07 am ---no idea, it just the way they did it- they were always fitted bipolar caps and later were fitted with polypropelene caps. I have worked on hundreds of the 9000 chassis and they have always been like that
they fail because they fail, just a common fault - thats why later models had the polypropelene caps fitted and they never fail. You should get a fair few years of operation with a standard bipolar cap so don't worry too much
--- End quote ---
Thanks for the conformation, it's much appreciated, I already discharged the monitor a few days ago and took the cap out, but I ordered a polarised cap by mistake, I ended up putting the old cap back in as my kids have been using the machine a lot lately, the correct NP cap came this morning so I will fit that as soon as i get a chance.
Thanks again :-)
Chris.