[TECH] - SEIKO 7548 Quartz MOVEMENT - How GOOD Is It? 

They're an indestructible movement. They don't even use a PCB, which is great as it's one less point of failure.

That's easy, the entire calendar side interchanges, that's it.

They're a really rewarding movement to work on. I recommend them to people wanting to get into tinkering as they are relatively simple, cheap, you still get a complex calendar, and if you can handle that, a 6309 or similar won't be a massive step forward. There's also parts around and if you can't find the parts, you can usually get another movement. Pulsar made a copy of it as well which is 100% interchangeable, I forget the caliber number, I'm sure someone will chime in with it.

@@hal0eight I think it might be the Pulsar Y513/Y514 series but I'm not sure.

No worries, glad it was useful for you

Trimmer, gain or loss on the timing. Tricky to adjust accurately without a quartz timing machine though

@@hal0eight Tank you. Might give it a go

It really depends where the trimmer is set to already. I don't remember which direction it is because I always do it on a Flashtest or QT-77. As the trimmer is so sensitive and just takes a whisker to change, I wouldn't try it without diagnostic equipment.

Until the quartz crystal cracks. That could be 10 years, it could be 2000.

Yes. In any case, this was a scrap movement so I wasn't terribly careful. But a good example of how careful you need to be around coils.

@@hal0eight I'm glad it was a scrap movement. I cringed when it happened, lol.

@@watchnut5305 Except for the rare stuff I pull apart here, everything else is scrap movements, which is why the rarer stuff is done a bit slower.

Good question. First step would be to get the movement on a pulse checker and make sure you get a pulse and to check the coil for resistance and continuity. You probably have 2 bad parts.