You thought you’d never see the day, but here it is. I’m servicing a Quartz watch 😉
I got myself a proper quartz watch tester, as you have to be able to measure the average consumption, something you can’t do with a run-of-the-mill multimeter.
Not that I am a great fan of Quartz watches, but Seiko at least builds proper movements, and not the throw-away plastic trash that others put in their watches…
This watch was sent in by Torsten from Hong Kong, and it stops from time to time, and needs a service. I measure a power consumption of 2.9 micro-amperes and that’s too much. Everything below 2.5 is fine, so there is too much dirt.
The wheel bridge actually has 2 jewels in it – that warms my heart a bit.
The gasket for the crown is almost completely dissolved – time to order a new one.
Bilingual day wheel.
For a quartz movement, this is as good a build quality as it gets.
Set and clutch lever assembly.
Bottom plate cleared.
On the top plate, I start by taking off the circuit board.
And here it is with its four screws.
This is a very sizeable motor coil indeed – no wonder the movement consumes over 2 micro-amperes.
With the gear bridge removed, you can see the wheels of the gear train.
Everything ready for the cleaning machine.
Reassembly starts off with the gear train.
I put the circuit back in, and test the movement. Power consumption is down to 2.1 micro-amperes, and I’m happy with that.
Now I can put the bottom plate back together.
The dial and hands go back on.
And I can case the movement.
Back together and ticking.
Hi good article, could you tell me where you obtained the gasket set, and if it has a part number please. I currently have the same movement on my bench for a service..
Try ebay.
I do have a Seiko Quartz Sport 100 it stopped and i don’t get someone to repair it for me i think it need a new coil and i need help i’m from South Africa
I do have a Seiko Quartz Sport 100 it stopped and i don’t get someone to repair it for me i think it need a new coil and i need help
Do you have a Seiko coil 7546A for sale? I’m in Canada.
No, all the watches on my blog belong to my customers.
Surprised that ‘two jewels in the wheel bridge’ warmed your heart, as that tells me that despite having a 7548 circuit board, the movement in that watch is really a 7546, a 7548 has actually got three jewels in the wheel bridge….
I know I should have paid more attention in GCSE Electronics but whats the copper capacitor\resistor for? I know some of the more expensive quartz watches have a sweeping movement on the seconds hand, is it anything to do with that?
If you are referring to the huge copper coil, that is the motor coil. It drives a little permanent magnet rotor, which drives the gear train to make the second hand move every second – so no sweeping second here. It’s the biggest mother of all motor coils that I’ve ever seen, so you have to be careful or the second hand will chop your finger off 😉
Oh I see interesting! Thanx for the info Christian 🙂
Welcome to the dark side 🙂
Indeed! I still don’t like the price <-> build quality relation found in quartz watches. In the end, as with most watches, you pay for the case and bracelet, but that is just more pronounced in quartz watches.
Nothing like taking apart a well built mechanical movement and admiring the build quality. Still waiting for that to happen with a quartz movement. This one is ok, but it doesn’t swipe me off my feet. Does Breguet do quartz movements? 😉