Re: Honeywell quartz clock component
I have a very similar timer module in a Honeywell Chronotherm thermostat. My 2/3AAA solder-tab battery was also dead, but it caused the timer to stop. I tried a test with a AA alkaline battery, but 1.5 volts caused it to run fast. A NiMH AA battery worked great as a temporary fix. I simply used a heavy rubber-band to hold the leads onto the battery. That was the good news. The bad is that an hour ago I went to solder in a std AAA battery holder so I could use a std AAA NiMh and screwed up! I neglected to remove the thermostat before soldering and the grounded tip of the iron drew a spark when it touched the battery wire. Now the clock is dead. I'm just beginning debug. Any suggestions? I'm a retired EE, but don't have a scope handy. I also neglected to recall which battery lead I had touched with the iron. I would love qualified suggestions!
By the way, the other number on your Eurosil 1115A, 1585, should be a date code of the 15th week of 1985 (mine is 4887 or 48th wk of 1987). That should help you date your unit. My thermostat was installed in 1989.
I have a very similar timer module in a Honeywell Chronotherm thermostat. My 2/3AAA solder-tab battery was also dead, but it caused the timer to stop. I tried a test with a AA alkaline battery, but 1.5 volts caused it to run fast. A NiMH AA battery worked great as a temporary fix. I simply used a heavy rubber-band to hold the leads onto the battery. That was the good news. The bad is that an hour ago I went to solder in a std AAA battery holder so I could use a std AAA NiMh and screwed up! I neglected to remove the thermostat before soldering and the grounded tip of the iron drew a spark when it touched the battery wire. Now the clock is dead. I'm just beginning debug. Any suggestions? I'm a retired EE, but don't have a scope handy. I also neglected to recall which battery lead I had touched with the iron. I would love qualified suggestions!
By the way, the other number on your Eurosil 1115A, 1585, should be a date code of the 15th week of 1985 (mine is 4887 or 48th wk of 1987). That should help you date your unit. My thermostat was installed in 1989.
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