modessitt
Volunteer: Encyclopedia Submission Moderator
So, I started with a working K4900. Installed a cap kit. Powered it up and about 5 seconds later - BOOM - C702 literally explodes! Nothing but a bunch of shredded stuff and a little black piece still attached to the two legs. Although it's not something I do often, I wonder if perhaps I put it in backwards during the rebuild. I replace it - making sure it is in properly - and power it up and nothing explodes this time, making me think I must have put it in backwards.
Except now I have a rolling pic that won't lock in. I find that the 175v I should have on the positive side of C702 is only 111v. I find the R702 (2.2-ohm 1/2-watt) is bad. I replace it with a 1-watt version I have handy, power it up - and 5 seconds later - BOOM! C702 is again blown to smithereens.
When I was checking voltages before I replaced R702, I found I had proper +130 coming out of the flyback.
So, anyone have this happen before? According to my manual and what was in there, C702 should be a 10uF 100v cap, right?
Except now I have a rolling pic that won't lock in. I find that the 175v I should have on the positive side of C702 is only 111v. I find the R702 (2.2-ohm 1/2-watt) is bad. I replace it with a 1-watt version I have handy, power it up - and 5 seconds later - BOOM! C702 is again blown to smithereens.
When I was checking voltages before I replaced R702, I found I had proper +130 coming out of the flyback.
So, anyone have this happen before? According to my manual and what was in there, C702 should be a 10uF 100v cap, right?



