dot mentions a very real problem that makes it hard to keep watches air and water tight - temperature change. I was just reading about this in a mechnical watch repair book...they did studies and found that a watch on the wrist heats up to 86 degrees (fahrenheit), forcing air out...then when you take it off it cools, creating a vacuum, "inhaling" dirty air or water if the watch is immersed, thru even the smallest cracks. Additionally, the lexan case has a bit of flex to it, so I'm thinking the gel acts like a hydraulic fluid, passing any pressure externally applied to the case, directly to the inner components....and pulling on components during the disassembly process. I would suggest that anyone opening a Synchronar module
consider making a small hole or two in the upper case(hot pin?) to let a little air get in above the solar panel and display, thereby relieving the vacuum created by the gel. And pull it open REALLY SLOWLY to give the gel a chance to seperate from the case.
Sorry I went for that personalized jab in my last post....hard to not get hot when the heat gets turned up.
Gonna try to stick to the subject at hand.
DragonFly: The Synchronar IS a chip on board design...look at pictures I posted. It is actually more of a single chip/circuit device than anything else made around that time - the reed swithces(analgous to contacts), the quartz crystal and a resistor to reduce power from the batteries are the only components NOT consolidated to the "master chip"(excepting the batteries,solar panel and display, of course).
Finally, I STILL think the Synchronar was very well built and designed, for it's time. It was a fledgling industry all the way around.
http://www.retroleds.com -
Sales of vintage LED, LCD, analog watches,
parts and gadgets -
repair tutorials & tips
Nov. 2022 - back in business!! BItter divorce is in home stretch, come grabs some great deals, I had to open the safe . . . damn attorneys. piss.