7549 - Random ticking issue - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 10-04-2019, 02:26 AM   #1 (permalink)
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Default 7549 - Random ticking issue

So I serviced my 7549-7000 a while ago and initially I didn't notice any issues. Now I'm noticing some weird issues with the ticking second hand. Sometimes there might be a long (1.5x) tick followed by a short tick (0.5x). At other times there will be a series of "bouncy" ticks where instead of ticking properly you get this real bounce in the second hand.
Now this one arrived non-running. I fitted a new battery but it was flat in a month. Figuring it might need a service I stripped it down and serviced it.
Has anyone seen this sort of behaviour from a 754x watch before? None of my other ones (including a couple I have serviced) exhibit this sort of behaviour.
Is it likely to be an issue with the circuit, coil, rotor, or perhaps a worn or not properly cleaned wheel?
I'd just switch out the circuit and coil to test first, but being a front loader this is quite a process.


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Old 10-04-2019, 03:13 AM   #2 (permalink)
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not an expert on these but could it be a loose seconds hand?
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Old 10-04-2019, 03:22 AM   #3 (permalink)
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I made a post about this a while ago same issue on my 7548-7010. Maybe you'll find answers there? One thing Id like to point out is that despite this issue the watch is still keeping time perfectly well. Which leads me to believe that it is a mechanical issue rather than electrical.

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Old 10-04-2019, 06:19 AM   #4 (permalink)
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Thanks for the link @borgsause. I'm guess then that you didn't get to the bottom of the problem? Yes, sometimes my issue is similar to yours. At others it's something else. I guess I'm going to have to crack the case again and start investigating. First take a close look at the second hand before moving onto the electrical parts. Last option is to pull down the gear train and examining/replacing wheels.
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Old 10-04-2019, 06:54 AM   #5 (permalink)
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I had something similar on a CO22- it would keep perfect time but it would not tick 60 times per minute- never got to the bottom of the problem
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Old 10-04-2019, 06:57 AM   #6 (permalink)
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Possibly hand issue, possibly circuit issue. But could also be worth checking the regulator of the circuit is intact and then the magnetic rotor is in good condition. If it were me I'd swap circuit first as it is easy. Then check hand if still an issue. And if not change the stator.
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Old 10-04-2019, 08:16 AM   #7 (permalink)
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Quote:
Originally Posted by tritto View Post
So I serviced my 7549-7000 a while ago and initially I didn't notice any issues. Now I'm noticing some weird issues with the ticking second hand. Sometimes there might be a long (1.5x) tick followed by a short tick (0.5x). At other times there will be a series of "bouncy" ticks where instead of ticking properly you get this real bounce in the second hand.
Now this one arrived non-running. I fitted a new battery but it was flat in a month. Figuring it might need a service I stripped it down and serviced it.
Has anyone seen this sort of behaviour from a 754x watch before? None of my other ones (including a couple I have serviced) exhibit this sort of behaviour.
Is it likely to be an issue with the circuit, coil, rotor, or perhaps a worn or not properly cleaned wheel?
I'd just switch out the circuit and coil to test first, but being a front loader this is quite a process.


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Could you perhaps drop the movement into a spare 7548/6309 case and then easier to change a part, test and so on until you find the problem ?
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Old 10-04-2019, 08:19 AM   #8 (permalink)
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Quote:
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Could you perhaps drop the movement into a spare 7548/6309 case and then easier to change a part, test and so on until you find the problem ?


Yes, I think that's what I'll do, John. That way I can at least swap out and test the circuit and coil and check the tube on the second hand. If that doesn't solve it then I'll need to do another tear down and service - probably switching out the rotor while I go.


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Old 10-04-2019, 11:29 AM   #9 (permalink)
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The step rotor is always my concern when working 7546/7548. Being magnetic it can easily pick up a bit of swarf from anywhere.
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