7548 coils - Seiko & Citizen Watch Forum – Japanese Watch Reviews, Discussion & Trading
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Unread 11-25-2019, 09:06 AM   #1 (permalink)
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Default 7548 coils

I am in need of a couple coils for my 7548 that have been sitting or about 5 years. can anyone help me, thanks, marks...
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Unread 11-25-2019, 09:47 AM   #2 (permalink)
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You won't find any old stock from cousins JBorels etc but can find used 7545 and 7546 watches on ebay and there is a pulsar not sure of the number ( 5y13 maybe?) that have the same coil.

Last edited by melt; 11-25-2019 at 09:50 AM.
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Unread 11-25-2019, 12:06 PM   #3 (permalink)
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Originally Posted by melt View Post
You won't find any old stock from cousins JBorels etc but can find used 7545 and 7546 watches on ebay and there is a pulsar not sure of the number ( 5y13 maybe?) that have the same coil.
Y512 and Y513
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Unread 11-25-2019, 01:13 PM   #4 (permalink)
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Quote:
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You won't find any old stock from cousins JBorels etc but can find used 7545 and 7546 watches on ebay and there is a pulsar not sure of the number ( 5y13 maybe?) that have the same coil.

+1 That's what I recommend. Find an old, beat-up, but running 7546 dress watch and scavenge for movement parts. I like finding ones with really worn gold plate cases - never feel bad about chucking the worn cases in the trash after I've got the movement out.
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Unread 11-25-2019, 07:55 PM   #5 (permalink)
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General plea to the group at large: don’t throw out open coils- they can often be repaired with silver conductive epoxy. The number of coils in circulation is only decreasing, so conservation will be key going forward.
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Unread 11-25-2019, 07:59 PM   #6 (permalink)
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anyone have any for sale or swap, heck I would swap my 99 year old mother-in-law for a couple...
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Unread 11-25-2019, 09:15 PM   #7 (permalink)
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Originally Posted by rileynp View Post
General plea to the group at large: don’t throw out open coils- they can often be repaired with silver conductive epoxy. The number of coils in circulation is only decreasing, so conservation will be key going forward.
Thanks for the Very Useful information. I never knew 7548 coils could be repaired? I have been throwing away non-working coils for many years now. After a coil swap I keep the rest of the 7548 movement including circuit block but have been tossing out the coils assuming they were useless
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Unread 11-25-2019, 09:32 PM   #8 (permalink)
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Unread 11-25-2019, 09:53 PM   #9 (permalink)
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Be careful going down the 7546 rabbit hole. Those watches grow on you and you find them hard to part out. 5 so far and counting.



2 for 2 fixing coils with conductive glue. Depends on where the break is. Screw driver slip, most common, easy. Single wire to terminal, not so easy. Had one that looked perfect until I looked at it under a stereo microscope. Surgical cut to one of the wires. Only visible with microscope. Could not see it with a 5x loupe.
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Unread 11-25-2019, 10:35 PM   #10 (permalink)
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Any parts material house should have the coil repair kit. Usually called “circuit maker” or “circuit repair “.


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Unread 11-26-2019, 01:10 AM   #11 (permalink)
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Quote:
Originally Posted by bigbluekyle View Post
Thanks for the Very Useful information. I never knew 7548 coils could be repaired? I have been throwing away non-working coils for many years now. After a coil swap I keep the rest of the 7548 movement including circuit block but have been tossing out the coils assuming they were useless
Tomorrow is a new day, let’s not dwell on the mistakes of yesterday. Perhaps I should also mention, please save those “unsalvageable” 613x chronograph wheels, there are fewer and fewer in the world every day! I’ve considered buying the broken ones to attempt to save, both coils and chrono wheels. Who wants to make some money on their garbage?
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Unread 11-26-2019, 01:21 AM   #12 (permalink)
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Tomorrow is a new day, let’s not dwell on the mistakes of yesterday. Perhaps I should also mention, please save those “unsalvageable” 613x chronograph wheels, there are fewer and fewer in the world every day! I’ve considered buying the broken ones to attempt to save, both coils and chrono wheels. Who wants to make some money on their garbage?





Agreed re chrono wheels;

I took one out of a 6139 on the weekend. I had to replace it with one out of a good movement of mine


I'll try and repair it in time.
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Unread 11-26-2019, 02:36 AM   #13 (permalink)
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Is conductive glue on a non-working coil a permanent fix or does the glue weaken and lose its effectiveness over time.
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Unread 11-26-2019, 09:32 AM   #14 (permalink)
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Well being a fairly typical English bloke I never chuck anything away, it all gets put in little labelled pots. Now I feel a bit better about it!


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Unread 11-26-2019, 09:38 AM   #15 (permalink)
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I’ve only had experience with the more expensive Zantech two-part silver conductive epoxy, so I can’t speak to all products, but I’ve know watchmakers who have seen decades-long results with it in their own personal watch. I’ve had a family member wearing a 7548 as a daily wear for several years now that has a repaired coil inside. I’m a little more worried about the Sun swallowing the Earth than this stuff weakening, but that’s just where my head’s at. The break must be prepped to accept the silver epoxy, and not all damage is repairable, but it’s worth a try.
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Last edited by rileynp; 11-26-2019 at 10:09 AM. Reason: Proof-read
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Unread 11-26-2019, 12:06 PM   #16 (permalink)
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Quote:
Originally Posted by bk_lake View Post
Be careful going down the 7546 rabbit hole. Those watches grow on you and you find them hard to part out. 5 so far and counting..........
Funny you should say that...Some of the 7546's that were bought for spares but resurrected instead...
Especially fond of this one, with it's 6105esq dial...
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Unread 11-26-2019, 01:01 PM   #17 (permalink)
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Quote:
Originally Posted by rileynp View Post
I’ve only had experience with the more expensive Zantech two-part silver conductive epoxy, so I can’t speak to all products, but I’ve know watchmakers who have seen decades-long results with it in their own personal watch. I’ve had a family member wearing a 7548 as a daily wear for several years now that has a repaired coil inside. I’m a little more worried about the Sun swallowing the Earth than this stuff weakening, but that’s just where my head’s at. The break must be prepped to accept the silver epoxy, and not all damage is repairable, but it’s worth a try.

I've got a couple broken ones that I'd love to try this on, but the Zantech stuff is about $60. I see a couple of alternative options discussed in the thread below. Any experience with them?
https://www.thewatchsite.com/34-watc...coil-wire.html
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Unread 11-26-2019, 01:55 PM   #18 (permalink)
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Originally Posted by twall3 View Post
I've got a couple broken ones that I'd love to try this on, but the Zantech stuff is about $60. I see a couple of alternative options discussed in the thread below. Any experience with them?
https://www.thewatchsite.com/34-watc...coil-wire.html
How much would a couple of coils cost Tom ?
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Unread 11-26-2019, 02:30 PM   #19 (permalink)
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https://www.amazon.com/Permatex-0911.../dp/B000ALBZJY

I've saved many coils with this stuff.
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Unread 11-26-2019, 03:51 PM   #20 (permalink)
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How much would a couple of coils cost Tom ?

A fair point, John . The answer is 4! With my recent luck on Ebay, I've been getting junky (but running!) 7546 dress watches for around $15 each. Regardless of cost, I always love to repair instead of replace, when it's an option.
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Unread 11-29-2019, 12:28 PM   #21 (permalink)
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Here is a challenge. Anyone want to rewire one? The wire size is known. The resistance value is known. How hard can it be?



I don't have the electrical experience to figure the details but I'm sure someone out there does. I did a senior project for an electrical company in college. They made specialty coils and transformers. The transformers were the size of my car but the mechanics of winding them are the same. I was on the business side of things not engineering. Not much more to offer here except I saw it done.

Last edited by bk_lake; 11-29-2019 at 10:14 PM. Reason: spelling
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Unread 11-29-2019, 02:44 PM   #22 (permalink)
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Originally Posted by bk_lake View Post
How hard can it be?
Spoken like a true non-engineer! ;-)
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Unread 11-29-2019, 03:00 PM   #23 (permalink)
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Seiko's patented coil wrapper
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Unread 11-29-2019, 03:42 PM   #24 (permalink)
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Quote:
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Spoken like a true non-engineer! ;-)
Sounds like my daughter when she starts a conversation with "Dad, how hard would it be to......." Which usually ends up with me with a major problem to solve...
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Unread 01-23-2020, 08:43 AM   #25 (permalink)
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Just an update on fixing coils.

There is a silver conductive paste that comes in a syringe, very cheap from China.

I have a 7548 coil that I had written off as it was so badly damaged the loose copper wires were hanging off the coil.

I smoothed the loose wires down and applied the paste all the way around the section of the coil.

Let it dry for 24hrs and to my pleasant surprise, the coil worked when I tested it.

You can still see some of the loose wires under the silver paste coating in the attached photo.

I've since repaired another 7548 coil and a coil from a Swiss quartz movement with the same silver paste.

A quick google search will turn it up for those of you who are interested.
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