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Brilliant, uniserver! A non polarised replacement! I'm no expert on whether the esr is OK on those, but it does say it's low. I am continually amazed at how technology is advancing. We would never have thought of getting a 47uF capacitor in ceramic just a few years ago. However, it's no...

Uniserver said It's no use me taking a photograph of the board I recapped correctly because I put the tantalums on upside down and soldered fuse wire to the pads. So you can't see the capacitor markings. I do that because I am afraid of shorting the pads to the ground plane. Generally the...

The capacitor is just a smoothing capacitor on the -5V supply. I think the -5V supply is only used for the printer (appletalk) and modem port drivers. Since the aluminium can capacitors which were on the LCIII as they came out of the factory did not cause a failure I wouldn't worry about...

It is a typo on the silkscreen and caps were installed the WRONG way on the two LCIII's we have (by the manufacturer) See attached photo. The meter probes have the red (+ve input to the meter) on the leg of the positive side of the capacitor. You can see it reads -4.96V.

Yes Rick, you are correct. If you are using those orangish tantalums, with the darker orange bar indicating the + side, you need to put that on the ground. So if you look at the photos uniserver posted. The one on the left hand end should face the opposite way from the other two in that row...

Thanks for the photos. I am saying that I am pretty sure that you have the C22 cap, the one on the left in the bottom two photos, round the wrong way. If you put a voltmeter onto either end of C22 the way you have it, you will see that the cap should be round the other way. I know the LCIII...

Hi, Am I the first person to discover this? C22 (the 47uF capacitor in the corner beside the power supply connector) on our LCIII has the + sign on the PCB on the negative capacitor terminal. This capacitor is between -5V and ground. The original C22 electrolytic on this board, and on...