Cisco 1802 Router Damaged by Lightning

[ant3202]

Hi All

I need some help.

I had one unit of Cisco 1802 which was damaged by lightning.
As attached you can see that the capacitor has been charred / burnt out.





The Fuse has been tested with a DMM and it was found to be open.

I know that getting cisco schematics are difficult.

Looking for values for C260 and C261

and curious on what is CR20 and CR22, which I believe is a protection diode.
Just wanna check how it is tested, made by ST ML16 C723

Thanks in advance.

[jiroy]

Re: Cisco 1802 Router Damaged by Lightning

Hi All

I need some help.

I had one unit of Cisco 1802 which was damaged by lightning.
As attached you can see that the capacitor has been charred / burnt out.





The Fuse has been tested with a DMM and it was found to be open.

I know that getting cisco schematics are difficult.

Looking for values for C260 and C261

and curious on what is CR20 and CR22, which I believe is a protection diode.
Just wanna check how it is tested, made by ST ML16 C723

Thanks in advance.

I noticed that cr usually do not refer to a diode . You can affirm that if there isn't an anode bar on it .. I think they are some capacitance resistance like their abbreviation say .

[stj]

Re: Cisco 1802 Router Damaged by Lightning

cr look like some type of diode - maybe a zener surge protector.

i would meter them, and the windings on that coil

[jiroy]

Re: Cisco 1802 Router Damaged by Lightning

cr look like some type of diode - maybe a zener surge protector.

i would meter them, and the windings on that coil

Somehow yes .. Looking at older routers reveal that this piece is a surge protector , but it's not a diode , or at least in testing purposes .

[stj]

Re: Cisco 1802 Router Damaged by Lightning

no, but it shouldnt look shorted

[stj]

Re: Cisco 1802 Router Damaged by Lightning

found it.
smp100mc-160 Trisil

[ant3202]

Re: Cisco 1802 Router Damaged by Lightning

found it.
smp100mc-160 Trisil

this is good info...... appreciate it.

[ant3202]

Re: Cisco 1802 Router Damaged by Lightning

update....

the bad smd had been removed...
does anyone has a clue on those two values?



many thanks

[stj]

Re: Cisco 1802 Router Damaged by Lightning

connected to ground from a data line - very low - probably in the pF's but high voltage to survive spikes.

you find stuff like that in modems and old set-top boxes with a fone connection.