Testing a TOP switch ic power regulator & MUR1620CT switch power diode

[aventy28]

Hi , I need help in testing wether these 2 components are in good working condition or not with a multimeter, these are:

1. A top switch ic power component (TOP249Y)

2. MUR1620CT (3 pin diode that is screwed to a heat sink with some transistors)

Please help.

 

[Harald Kapp]

1. Can't be tested by a multimeter alone. You'll have to rig up a test circuit and check the IC for correct operation. Test circuits are usually shown in the datasheet (see page 39). Or build a simple circuit and see whether the chip works.
2. Test as diodes from pins 1-2 and from pins 3-2, see datasheet.

 

[aventy28]

1. Can't be tested by a multimeter alone. You'll have to rig up a test circuit and check the IC for correct operation. Test circuits are usually shown in the datasheet (see page 39). Or build a simple circuit and see whether the chip works.
2. Test as diodes from pins 1-2 and from pins 3-2, see datasheet.

Thanks for the helpful info, oh and just one last thing... I have this cracked ceramic capacitor (yellow disc shape, with 102K on it and a B on top of it) because I was trying to remove a bad capacitor behind it from this yellow adhesive glue but I didn't know it was sticked together and i was trying to remove the bad capacitor using a screw driver and I accidentally damaged this ceramic capacitor with it.

My question is , I was planning to replace it, but the only electronics shop in my area has the 102 ceramic capacitor with the K and the B. Would that be ok to replace the 102K B type, this is on a switch power board to my radio HiFi system.

 

[aventy28]

Correction: with the K and B not written on it, just 102

 

[Harald Kapp]

102K is 1000 pF or 1nF, 10% tolerance.
I have no idea what the B means. Do you have a picture?

 

[aventy28]

102K is 1000 pF or 1nF, 10% tolerance.
I have no idea what the B means. Do you have a picture?

I couldn't take a photo of it because my camera won't focus, but it is a bit similar to this picture below. The K is beside the 102 but the B is on top of it, I am currently looking for the schematic to see it's value recommendations

 

[aventy28]

Just found the schematic, however I matched it with this damaged ceramic capacitor according to its related circuit it connects to, but it just say 102 .....and that's it,

Does that mean I can just replace it with a 102 ceramic capacitor (the one without the K tolerance and B written on it, because that's the only one available in where I live)?

Back to the schematic circuit diagram there was no note whatsoever related to this ceramic capacitor in particular, and even in the electrical components parts list it just says: ceramic capacitor: 102 and that's it.

 

[Harald Kapp]

Does that mean I can just replace it with a 102 ceramic capacitor

Obviously yes.