seiko 7123 coil wanted or best advise

[waynewinder]

Hello everyone 

i have an old seiko 7123 that needs a coil ,i decided to sort through a box of old watches that ive had lying around for at least 25yrs some ive had longer one or two have memories  which i will keep most i will sell on  i know next to nothing about watches only what ive found on the internet ,if anyone can help in anyway that would be great .

regards wayne 

 

[Melt]

Test your coil with a multimeter it should read 3K ohms plus or minus 0.3 K ohms approx.

If the tiny copper wire to the right hand pad as you look at the watch with the crown on the right is damaged then this might work. If it damaged on the left pad this won't work.

Also try this if both wires to pad look good.....but only solder to right hand pad.

Take a piece of wire and solder both ends.
Now solder the wire to the main body of the coil wires and then hold other end on the right pad to achieve 3k ohms plus or minus 200 ohms with a multimeter. Some coils vary in resistance. Solder to the right hand pad but not to close to the end or the circuit board won't screw on properly. Hopefully you now have a working coil. If if doesn't work don't blame me at least you tried, maybe even try to resolder again and again until.....it works

[AndyGSi]

On 1/11/2025 at 2:27 PM, waynewinder said:

i have an old seiko 7123 that needs a coil

What makes you think it needs a coil?

Here's the details to check.

If it is the coil then here's the movements that use the same one.

[waynewinder]

On 1/12/2025 at 7:37 PM, Melt said:

Test your coil with a multimeter it should read 3K ohms plus or minus 0.3 K ohms approx.

If the tiny copper wire to the right hand pad as you look at the watch with the crown on the right is damaged then this might work. If it damaged on the left pad this won't work.

Also try this if both wires to pad look good.....but only solder to right hand pad.

Take a piece of wire and solder both ends.
Now solder the wire to the main body of the coil wires and then hold other end on the right pad to achieve 3k ohms plus or minus 200 ohms with a multimeter. Some coils vary in resistance. Solder to the right hand pad but not to close to the end or the circuit board won't screw on properly. Hopefully you now have a working coil. If if doesn't work don't blame me at least you tried, maybe even try to resolder again and again until.....it works

Hello ther thanks for your reply 

the coil in my watch  is in mess it looks fluffy with amount of damage broken wires everywhere so maybe to far gone .but thanks anyway 

regards wayne 

[waynewinder]

On 1/12/2025 at 8:23 PM, AndyGSi said:

What makes you think it needs a coil?

Here's the details to check.

If it is the coil then here's the movements that use the same one.

cheers Andy i will start a search try my luck 

regards wayne 

[waynewinder]

On 1/12/2025 at 7:37 PM, Melt said:

Test your coil with a multimeter it should read 3K ohms plus or minus 0.3 K ohms approx.

If the tiny copper wire to the right hand pad as you look at the watch with the crown on the right is damaged then this might work. If it damaged on the left pad this won't work.

Also try this if both wires to pad look good.....but only solder to right hand pad.

Take a piece of wire and solder both ends.
Now solder the wire to the main body of the coil wires and then hold other end on the right pad to achieve 3k ohms plus or minus 200 ohms with a multimeter. Some coils vary in resistance. Solder to the right hand pad but not to close to the end or the circuit board won't screw on properly. Hopefully you now have a working coil. If if doesn't work don't blame me at least you tried, maybe even try to resolder again and again until.....it works

cheers buddy when say take a piece of wire and solder both ends what kind of wire .sorry to sound dumb but i have chemo brain today .

[Melt]

Any small gauge copper wire. Like you might see used in a car or motorcycle. It doesn't have to be thick. I think I just took a strand from a random wire I had. I will try to find a photo if I still have one. 

[waynewinder]

cheers buddy photo would be great 

regards wayne