replying to timnels, Kenny wrote:
I don't know what sort of timer is a T103. But I have a very old (but
excellently designed) Oasis Dundee 9 Station irrigation pump controller, which
very recently developed an issue where its digital clock was running too fast.
About an hour later, the clock would be something like 7 minutes or so ahead of
'actual' time of day. My controller doesn't appear to have a 'crystal' component
on the circuit board. But it normally keeps the correct time even when AC power
is switched off, and powered by a back-up battery. So there must be an
oscillator circuit in my board's circuit - somewhere. The beauty of my
particular irrigation controller is that it only has two electrolytic capacitors
in it. I changed the smaller electrolytic capacitor (a 100 microFarad one). No
improvement. I then changed the larger 470 microFarad one, which fixed the
issue. As we know, due to the limits of our technology - electrolytic capacitors
are probably the number 1 cause of electronic circuit failures in circuits.
Since my particular board had only two capacitors, it allowed me to sort things
out fairly quickly. The interesting thing is - the electrolytic capacitors do
not necessarily need to be bulging (or physically broken) when they go bad or
fail. But, they often will have a bulging top if they've failed. So, if your
timer has electrolytic capacitors in it.... check them out.