Coil for old Seiko Credor -- 4002920

[Kkramme]

Hello All.

FYI, I clumsily damaged a coil on a pristine Seiko Credor -- coil number 4002920

My watch repair guy is having difficulty sourcing this (or a substitute/replacement one)?  Can anyone help, please?  Thanks!

[Kkramme]

Any other thoughts on how I can get a replacement coil? Any “hidden” or unknown physical shops (in Australia or elsewhere) that might have them in stock (but not always online)?

[Waggy]

Probably easier to get a complete new movement - but CousinsUK list it as discontinued. Maybe someone on here knows a substitute movement ?

[Neverenoughwatches]

On 4/24/2024 at 2:17 AM, Kkramme said:

Hello All.

FYI, I clumsily damaged a coil on a pristine Seiko Credor -- coil number 4002920

My watch repair guy is having difficulty sourcing this (or a substitute/replacement one)?  Can anyone help, please?  Thanks!

 There are some parts on Ebay for the seiko 6020A, it may just be a waiting game for someone to strip one down, NOS will be more scarce . K would strip your movement down to the module then start looking at other seiko movement to see if that coil is used, then seek out a seiko part dealer. Also Retrowatches youtube owner Mike may give you some advice try him on his site . He also hangs around amateur watchmaking groups.

[Kkramme]

On 4/26/2024 at 3:08 PM, Waggy said:

Probably easier to get a complete new movement - but CousinsUK list it as discontinued. Maybe someone on here knows a substitute movement ?

Good question!! Anyone know of a substitute movement??!!

[Melt]

Seiko watches that use the same coil as 9020A. Borels gives different part number to the one you say......

COIL BLOCK 4002855

 SEK 5C20A QUARTZ ANALOG DSS ALARM CALD DAY-DATE

 SEK 5C22A QUARTZ ANALOGY DSS ALARM CALD

 SEK 5C23A QUARTZ ANALOG DSS ALARM CALD

 SEK 5C59A QUARTZ ANALOG 5 JL DSS CALD ALARM

 SEK 9020A QUARTZ ANALOG

 SEK 9021A QUARTZ ANALOG W/BRTY LIFE INDICATOR DSS

 SEK 9022A QUARTZ ANALOG DSS CALD

 SEK 9023A 

 SEK 9029A QUARTZ ANALOG CALD

 SEK 9521A 

 SEK 9522A 

 SEK 9533B 

 SEK 9550A QUARTZ ANALOG 7 JLS

 SEK 9552A QUARTZ ANALOG 7JLS CALD W/CORR DSS

 SEK 9559A 

 SEK 9570A 

 SEK 9571A 

 SEK 9572A 

 SEK 9581A 

 SEK 9587A 

[AndyGSi]

@Melt It's a 6020A and the Coil is a 4002920 which was only used on the 6020A & B

[Melt]

Oops Early morning misread apologies but this may help....my bodge for coils...

Then if tiny coil wire connected to the pad is damaged from the top of the windings...usual. Take a small strand of copper wire then solder both ends. Solder one end of the wire to anywhere on the coil and then to the pad for the top winding, but not to close to the end or the circuit board because it won't screw down properly. Hopefully you now have a working coil. Your looking for 3k ohms plus or minus 200 ohms with a multimeter. Some coils vary in resistance. If if doesn't work don't blame me at least you tried, maybe even try to resolder again and again.

If the coil wire is damaged from the the bottom of the windings this won't work.

 

[AndyGSi]

Literature shows coil between 1.5k & 3.5k