Mitsubishi Delica Owners Club UK™

[Derek]

I need advice on replacing a capacitor on my monito'rs power board.
About six months ago the screen suddenly went blank even though all the indications were that it was "communicating" with the PC as normal.
I swapped in a spare monitor and everything was fine.
I was suspicious when I stripped down the monitor and saw what looked like a burnt out component so bought a new power board.
The monitor came back to life with the new power board and worked fine for a couple of months until the same thing happened.
I got a replacement board FOC from the supplier and everything is again working.

Checking out the "dead" board I immediately saw the same burnt out component, a ceramic capacitor -


I'd like to replace the capacitor so I've got a spare board. I'm hoping it was a duff capacitor and not something else causing it to burn out.
What've found out is -
"
That is a ceramic capacitor. As you surmise, the value is 12 pF and rated at 3000 volts. U2 is a temperature coefficient. In this case, it stands for N750, which is a pretty loose spec, +/-120ppm over the range, -20 - +85 deg. C. For reference here are the codes for your capacitor and those with tighter specs:

C0 = NP0, +/-30 ppm
S1 = N33, +/-30 ppm
U1 = N75, +/-30 ppm
P2 = N150, +/-30 ppm
R2 = N220, +/-30 ppm
S2 = N330, +/-60 ppm
T2 = N470, +/-60 ppm
U2 = N750, +/-120 ppm

If you can't find the exact value, you could probably use a 15 pF cap without any problem. You could use any cap with a better tempco.

The highest voltage on any supply is +/- 12 volts, and even allowing for very high spikes, any voltage rating greater than 500 volts should work well.

From the pic, it looks like the lead spacing is 0.238", which is a standard size.
"

Maplin have one -
"
Metallised Ceramic Plate 15pF Capacitor

A miniature ceramic capacitor with a cement-coated case. It is suitable for temperature compensation in tuned circuits where low losses, close tolerance and high stability are required.
Specifications:Tolerance: ±5%Working voltage: 100VdcInsulation resistance: >1000MΩTemperature coefficient: ZeroPower factor: <10x10<+>4Dimensions:Thickness of body: 2.25mm max.Lead spacing: 5mmLead length: 25mmCase Diameters: 5mm
"
Is this one okay?
If not can anyone recommend somewhere to get the correct one?

Cheers
_________________
1996  PE8W, 1994 PF8W*2, Gilera Fuoco, and a Smart Electric Drive.

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