Hi all,
I've been asked to look at one of these that was dead.
On opening I've found that R21 (1R) was burnt and open cct and IC21 had exploded (TNY280).
The snubber cap (C25) is original and will need upgrading to a 2KV one, as has been suggested by others.
All the main FETs and diodes appear to be OK as does the SMD components. I'm unable to find a schematic for this model to delve any deeper at present. I've removed the high voltage cap and it measures 130uF instead of 150uF although it's ESR is still very low. No bulging or leaking caps are evident but that's no guarantee they are OK of course.
I'm probably going to re-cap it anyway to get rid of all those 'elite' caps.
Does anyone have a schematic so I can investigate why IC21 blew up. I'm not comfortable just swapping parts and crossing fingers.
Cheers
Bob
I've been asked to look at one of these that was dead.
On opening I've found that R21 (1R) was burnt and open cct and IC21 had exploded (TNY280).
The snubber cap (C25) is original and will need upgrading to a 2KV one, as has been suggested by others.
All the main FETs and diodes appear to be OK as does the SMD components. I'm unable to find a schematic for this model to delve any deeper at present. I've removed the high voltage cap and it measures 130uF instead of 150uF although it's ESR is still very low. No bulging or leaking caps are evident but that's no guarantee they are OK of course.
I'm probably going to re-cap it anyway to get rid of all those 'elite' caps.
Does anyone have a schematic so I can investigate why IC21 blew up. I'm not comfortable just swapping parts and crossing fingers.
Cheers
Bob
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