Still working on Seiko 7T34

[Jakson]

Morning all-Could anyone confirm for me that when you have an open-cicuit coil on one of these Seiko watches it only affects the rotor that the coil is working with or does it stop all functions? I have one of the smaller coils failed on my watch-any advice greatfully received, Kind Regards.

[watchweasol]

Hi Jackson  As a rule they are all separate functions driven from a single source namley the circuit block which sorts out all the various functions. If one coil breaks down one would suppose the remaining functions would operate as usual. The fact that none of the functions work it would suggest that what ever did the coil in had an effect on the block. One could remove the block assy and test it for functionality before going any further. hope that helps a bit. 

[Jakson]

Hi Watchweasol and thankyou for your reply confirming my thoughts,iv gone around things the other way but still no luck-by which i mean i took the circuit board out first and it was damaged,iv managed to get another that visualy looks good-no burn or acid damage? Fitted it-no luck so then checked the coils and found one of the smaller ones open circuit, thats where i am now-maybe iv still got a bad pcb?

[watchweasol]

Hi Jackson  It is possible you got a duff block it is possible to check the block on its own with the right tools look up Israel Angeles (in the phillipines)  a very talented chap who runs a watch repair school and has made some tools for quartz repair ( I use one) very useful

[Jakson]

Hi Watchweasol and thankyou for your reply confirming my thoughts,iv gone around things the other way but still no luck-by which i mean i took the circuit board out first and it was damaged,iv managed to get another that visualy looks good-no burn or acid damage? Fitted it-no luck so then checked the coils and found one of the smaller ones open circuit, thats where i am now-maybe iv still got a bad pcb?

[Jakson]

Hi Watchweasol and thank-you again that sounds very interesting? i will certainly take a look with great interest,i didnt realy think you could test the ic without specialist equipment but did wonder if the crystal may have stopped oscillating-that i imagine would stop everything, probably not a common fault but possible?