Re: Looking for Schematic for Intermatic E1210 Countdown Timers
Having trouble sourcing an X2 10% Cap that will fit where the original cap sits. It can be 25x11 mm at the very max. There is no extra room inside the case. Most X2's at Digikey etc., are 26.5mm--and I also need long leads to finagle a large cap in there.
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Re: Looking for Schematic for Intermatic E1210 Countdown Timers
Intermatic no help on board schematic. Bought identical unit from ebay. Definitely designed to default to constant-on load when the circuit under discussion goes open. Soldered in a 2.2k resistor (original calls for 2k; did not have). Timer controls unresponsive, but resister got pretty hot in short order. Removed resister and and tested for kicks; yep, constant-on load. Resistor shows 50v (!), against leg of 1uF cap, with slight variation on either side. Need to understand how the capacitative dropper works. Also,...
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Re: Looking for Schematic for Intermatic E1210 Countdown Timers
Resistor died open, as expected. Duh. Zener seems functional w/continuity test. My guess now is that the chip contains a normally closed circuit that's kept open by low power (until user selection). Maybe it's designed to go constant on if low power fails, as an alert that something's amiss.
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Re: Looking for Schematic for Intermatic E1210 Countdown Timers
Thanks stj and redwire for your kind responses. I'll start with the suggestion by stj, to check the cap. I just now installed a replacement timer from Amazon in the master bath ([url]https://www.amazon.com/dp/B00TSUJ5EU[/url]). I ordered it right away when the master bath died. I might be a little slow to respond to the thread. I had cataract surgery last May/June, and they're not finished with me yet! Anyway, that slows me down on [I]everything[/I]. I have to work extra to make out solder joints, etc.Re: Looking for...
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Looking for Schematic for Intermatic E1210 Countdown Timers
Both of the Intermatic E1210 countdown timers in our house just went bad within two weeks of each other. I suppose I installed them 15-20 years ago (for bathroom exhaust fans). They both came on without assistance and remained stuck on--no response to user controls. I reset the household circuit for the first, and then for the second, without success. Stuck on. Opened each. Both show failure in same area of board: a zener, a resistor, and two shottkes. The resistor has a pink band. I don't know if that's original or heat-generated. Anyway, it's only a guess, but if the resistor broke down that...
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Re: New Members - please post your introductions here
Hi! I'm Mark from the Twin Cities, Minnesota. I'm a librarian, registrar, and instructor (New Testament Greek). I play guitar and like to fix things of all kinds, including electronics. I joined today because I'm looking for a schematic that I cannot seem to find.
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