Nikon charger MH-24 transformer replacement

[sdancer75]

Hi


Is there any replacement part for the transformer (mark code OR20A153)  shown at the attached pictures?The part is from a Nikon charger MH-24. Anyway, how can I possibly know if the two parts are matched? ie, the same primary and secondary resistance?

PS : After a fall, the lead conductor is torn apart from it's pin base. I tried to find the edge to reconnect it but I couldn't despite my efforts with my microscope. Anyway, I am thinking to replace it but I don't know the type.

Can someone help with this?

[Uunoctium]

looks very close to Eaton ECMT-R Common Mode Chokes
Example from Mouser:
https://www.mouser.de/ProductDetail/Bussmann-Eaton/ECMT1V2429S-5R0-R?qs=TCDPyi3sCW1elWL00jyiFA%3D%3D

[Zoli]

Hi


Is there any replacement part for the transformer (mark code OR20A153)  shown at the attached pictures?The part is from a Nikon charger MH-24. Anyway, how can I possibly know if the two parts are matched? ie, the same primary and secondary resistance?

PS : After a fall, the lead conductor is torn apart from it's pin base. I tried to find the edge to reconnect it but I couldn't despite my efforts with my microscope. Anyway, I am thinking to replace it but I don't know the type.

Can someone help with this?

Looks like is the 15mH one(153 printed on the top).

[mariush]

If it's a common mode choke, you could just replace it with two jumper wires. The part is there to filter/reduce the "noise" sent back into the AC grid.  Without it, maybe an AM radio would not work as well, or something like that, but otherwise it would be perfectly safe.

If you look at the traces on the circuit board it would be something like this 

---- ac ~ ---- ~                        + ------ +----- +            + -----  +------ +
                        bridge rectifier         cap (c1)      choke         cap (c2)         DC-DC converter chip (U2)
---- ac ~ ---- ~                        - ------  -  ----  -            - ------  - ------ -

Between the two + of the choke you'd have a coil , and between the two minuses of the choke you'd have a coil  ... so you could replace with two wires , one between the two + of the choke, one between the two - of the choke

[sdancer75]

Yes, my mistake, it is an inductor. I measured about 10mH. The rated current of the inductor should be output current of the charger?

Thanks

[sdancer75]

looks very close to Eaton ECMT-R Common Mode Chokes
Example from Mouser:
https://www.mouser.de/ProductDetail/Bussmann-Eaton/ECMT1V2429S-5R0-R?qs=TCDPyi3sCW1elWL00jyiFA%3D%3D

yes that's true, my mistake.

[sdancer75]

If it's a common mode choke, you could just replace it with two jumper wires. The part is there to filter/reduce the "noise" sent back into the AC grid.  Without it, maybe an AM radio would not work as well, or something like that, but otherwise it would be perfectly safe.

If you look at the traces on the circuit board it would be something like this 

---- ac ~ ---- ~                        + ------ +----- +            + -----  +------ +
                        bridge rectifier         cap (c1)      choke         cap (c2)         DC-DC converter chip (U2)
---- ac ~ ---- ~                        - ------  -  ----  -            - ------  - ------ -

Between the two + of the choke you'd have a coil , and between the two minuses of the choke you'd have a coil  ... so you could replace with two wires , one between the two + of the choke, one between the two - of the choke

Yes, I found out that it is indeed an EMI filter choke. I will try to replace it with a 10mH/1.2A choke but if I don't find one I will short the pins.

Thanks,

[abdulbadii]

Not transformer, it's common or differential choke, Imo need a schematic

[tunk]

The rated current of the inductor should be output current of the charger?

No expert, but this is on the high voltage side, so I don't think it needs to.
Again no expert, maybe something like this (0.7=70% efficency):
8.4V/230V * 1.2A / 0.7 = 0.063A