Adrianmsmith One thing i cant remember @DavecUK some time ago there was talk of removing cap c4 from the gicar but cant remember why and if it was only for a certain version of the gicar ….
IIRC, it was only in the case of machines shipped until the 3Q of 2021 of Evo 1.
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Here is the background
… a “pump heartbeat” every 1.7s….
C4 is used for the optional 230V Vostok external pump, when left on the board it forms a timing circuit as it charges and discharges, which fires one of the SSRs controlling the pump.
Symptom
You “might” hear your pump pulsing every 3-4 seconds, it’s very quiet, though. If you do, and want to stop it because it’s irritating (it won’t actually cause any damage), follow the procedure below. If you can’t hear a thing….don’t bother, especially as it won’t damage anything….you will simply get a tiny flux in the pump winding occasionally.
The offending capacitor at C4 is identified with the arrow.
