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

[@looseunit1615]

This is a great video. I have a Seiko 7548 700B dive watch. It is 35 years old. I had a watch guy put a new battery into it after it sat idle for 15 years. And away it went. I bought it new in 1985. It went through 12 years in the NZ Army with me and I took it on over 200 dives. An awesome watch. Keeping perfect time and it has been a week since putting in the new battery.

[@hal0eight]

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

[@wings4victory]

Flipping amazing. I have new respect for SEIKO

[@winstonlanda7731]

I literally just ebay'd an '86 7548-7000 and it arrives from Japan in a week. I cannot contain my excitement. Thank you for your informative video.

[@fairfaxa]

Fantastic Video Adrian, I just bought an 81 JDM 7548 today and am stoked by your commentary. I really wanted the 7c43, but lack of parts is a real worry there: I also love your Seiko watch, Camry and Cockroach post apocalyptic analogy too… SO TRUE!! Cheers

[@IBNR1]

I've just gotten into these 754x movements, my first real foray into working on quartz movements, and this video is extremely helpful - thank you!

[@hal0eight]

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.

[@IBNR1]

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

[@leonardohunter1636]

Great video and thanks for the interesting facts about the compatibility between the Seiko 6309 and Seiko 7548 movement, wonderful, good job.

[@hal0eight]

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

[@johnno_oz5587]

Very informative. I am starting watch basics have been practicing using a "junk" 7546. Also have a 7548 and almost managed to lose one of the battery clamp screws. Thanks for the tips and a bit of Seiko engineering background.

[@cristobalosuna3106]

Great video with lots of interesting advice! thank you for sharing.

[@hal0eight]

No worries, glad it was useful for you

[@aflatminor]

Hi, Smashing video! Can parts for the 7549 and 7546 movements be had ok in Oz, They seem difficult to find in the UK

[@mg2612]

Hi Will the 7548 movement fit the skx007 case? If not, is there a workaround how it will fit? TIA

[@jjjensn]

Very informative. thx Can you tell me what that brass screw on the back, with the arrow "back and forth" sign next to it is for. I'm hoping it is for adjusting the movement

[@hal0eight]

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

[@jjjensn]

@@hal0eight Tank you. Might give it a go

[@billytscherne4643]

How long can quartz movement last ?

[@hal0eight]

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

[@blakefrost8303]

Hey there, when using the trimmer is it clockwise to speed up the movement and anticlockwise to slow it down? I have a 7546.

[@hal0eight]

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.

[@watchnut5305]

Did the coil still work after you slipped and hit it in the video?

[@hal0eight]

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.

[@watchnut5305]

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

[@hal0eight]

@@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.

[@JasonBlank]

Lovely vid other than that coil bump. Lol, silly sausage.

[@Erzbergersteuern]

i change the coil, circuit blook and i clean the parts (battery leak) but it doesn't work. any clue why the watch doesn't work? Best regards Simon

[@hal0eight]

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.