Ewen

[Ewen]

Seiko Kinetic 5M62..Hello,

I bought this not working and have replaced the 'capacitor' with a seiko kit(surely it's a rechargeable battery).

The battery was showing approx 1.3v when I put it in and the watch did not start working. Surely this means it's an electrical fault, maybe with the circuit board. I've seen that video of the stripdown where the watch does not work and the guy goes on to diagnose a problem with the winding wheel. However, if the new battery/accumulator/'capacitor' was charged when put in, it should work straight away (no 'winding' required) and the fault is almost certainly electrical. Any suggestions for common electrical problems with these watches. The contacts are definitely correctly aligned. Any help much appreciated.

[jdm]

33 minutes ago, Ewen said:

The battery was showing approx 1.3v when I put it in and the watch did not start working. 

There is no guarantee that the rechargeable battery replacement comes fully charged. So you will have to find a way to charge it, wired or by induction. You can also test or even run permanently run the quartz module using a common SR battery. 

[watchweasol]

Hi As jdm remarked there is no guarantee   That the capacitor comes fully charged  or has not been degraded when fitting. I have attached the tech sheets for the seiko and also capacitor information.    To check out the watch either  fit it on a winder  or an induction charger .      An electronic tooth brush charger with a foam collar on the point has been known to charge capacitors (induction).    

Seiko 5M62, 5M63A.pdf Batteries - Seiko Capacitors (1).pdf

[Marc]

1 hour ago, Ewen said:

The battery was showing approx 1.3v when I put it in

I believe that this is an MT920S, which is simply an MT920 Lithium rechargeable with tags to fit Seiko (hence the "S").

The nominal operating voltage for an MT920 is 1.5V, so if yours was reading 1.3V it was not properly charged.

[Ewen]

Thanks to all three of you for all this advice.

I have stripped it down to and removed the circuit board. I cannot see anything wrong with the contacts or the condition of the board. However, I'll try putting a 1.5v battery in to test. I shook it 250 times and it didn't start but I'll try some of the tests given on the data sheet.

Thanks again to all of you, much appreciated.

[Ewen]

Hello again, Ewen with the 5M62 Kinetic.

I've tried charging it by induction using an electric toothbrush unit and it remains completely dead. I've also tried rotating it 250 times and there is no apparent electrical activity at all. The mechanical parts all seem to move freely. The battery charge remains at 1.3v. On the data sheet it states that the operating voltage is between 0.45v and 1.5v, so surely 1.3 v would be enough to get it moving?

Since charging remotely works  by induction (ie via the coils in the watch) I am thinking the next logical thing to do is test the coils, or at least see if the stated resistance agrees with the values in the data sheet. I cannot see any breaks or marks on the circuit board to suggest that it has been disassembled carelessly in the past. Any thoughts?

[watchweasol]

Hi  I would have thought  according to the values on the data sheet it would start, If the voltage was on the low side the sweep hand jumps in 2 sec leaps but as it is dead I would go through the basic checks.