This is great - my thanks to Hanno and everyone for adding information to this thread. I too had no idea there were 3 main variants of the 1602 module. I'd just assumed that any Digital 1/TC3 with a bar display had a swapped module. Carrying-back new boards at service is something I had overlooked.
I guess that means all Digital 2/TC4
must have originally had an alpha-numeric bar display type module installed at the factory, because of the Dow function which I guess is referenced in the instructions? (I haven't seen a Digital 2/TC4 instruction card)
charger105 wrote:All Omega Frontier modules used QCs with SSIH printed on top.
If it's been replaced by Omega with an 'updated' module it should have SSIH written on the crystal.
If it's been fitted with a standard Frontier module from another watch, then it won't have this type of QC (unless the swapper swapped the crystal too).
Also differences in the style of timing trimmer?
The two Omega boards I've seen have a trimmer head designed for adjustment with a flat-blade screwdriver, whereas "standard" Frontier boards seem to have a recessed small square drive type trimmer.
Whatever the answer, it wouldn't stop me using a dot type board in a Ditgital 2/TC4 case.... but that's a bit off original topic.