This is a dead WS-C1924C-EN 24 port switch with optical uplink do dahs!
The PSU is gubbed.
Whereas the O/P filter has 4 of Nichicon PL 2200uF 10V C22, C15, C14 and C17, the ESR of these
all appear within advertised values, that is 0.01 - 0.04 on my ESR meter.
In the primary, the main cap is Nichicon LX rated at 100uF 400V
C4 ESR reads 0.9. This is ok
However, two of three remaining caps, namely;
C20 220uF 35V Nichicon VX and C5 Nichicon PF 47uF 35V
reads nil and 21.0 respectively on my ESR meter.
These require replacement.
I've never has a nil reading on my ESR meter before.
The other Nichicon 47uF 35V PF reads an ESR of 3.0
Two of the pins have cold joints on the main transformer.
This may de due to the track lifting (easy to repair) and such like.
I will check the insulation as well here.
This should be a quick fix bearing in mind I will require to test
the rest of the supply
Both of the caps on the main pcb are 1000uF 10V UCC LXF.
Were these replaced with LXY?
I'll get to these in due course for a check.
As most of these series are now dated, what have they been
relpaced with? I known PM replaced PL
What of the others?
Any help appreciated
The PSU is gubbed.
Whereas the O/P filter has 4 of Nichicon PL 2200uF 10V C22, C15, C14 and C17, the ESR of these
all appear within advertised values, that is 0.01 - 0.04 on my ESR meter.
In the primary, the main cap is Nichicon LX rated at 100uF 400V
C4 ESR reads 0.9. This is ok
However, two of three remaining caps, namely;
C20 220uF 35V Nichicon VX and C5 Nichicon PF 47uF 35V
reads nil and 21.0 respectively on my ESR meter.
These require replacement.
I've never has a nil reading on my ESR meter before.
The other Nichicon 47uF 35V PF reads an ESR of 3.0
Two of the pins have cold joints on the main transformer.
This may de due to the track lifting (easy to repair) and such like.
I will check the insulation as well here.
This should be a quick fix bearing in mind I will require to test
the rest of the supply
Both of the caps on the main pcb are 1000uF 10V UCC LXF.
Were these replaced with LXY?
I'll get to these in due course for a check.
As most of these series are now dated, what have they been
relpaced with? I known PM replaced PL
What of the others?
Any help appreciated
