Bypassing Ultrasonic Cleaner Timer

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>>1226723
Here is the circuit board under the control panel.

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>>1226724
Close up of the chip. It says CD4820

>>1226723
what do the other boards look like?

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>>1226728
This is the only other one. I THINK this board only powers and runs the unit/motor that provides the cleaning itself.

>>1226731
The six pin connector on the 9 o clock position on the edge of the board runs to the control board

CD4820 isnt a standard chip, it's the model number of the device. so, the chip is almost certainly a custom device we have no info about.

given that, the 2 simplest methods i can think of is to (1) add a circuit that simulates the pushing of whatever buttons are needed to restart the unit, or (2) add a switch that turns on the vibrator thingy at will. seems likely it's turned on by relay K1, and that you can force the relay on by applying the appropriate DC voltage across D5. measure voltage across D5 when operating, and then after the timeout, to confirm.

>>1226739
Thank you, I will give (2) a try

>>1226723
measure red/black of control board. probably +/-, probably 5v ish.
unplug from drive board and power on bench. operate while measuring other 4 leads.
construct circuit to simulate output.

also consider it might not be designed to do anything more than 8 minutes. does it let you reset immediately or require cooldown or unplug cycle to restart?

there are two relays, how many ultrasonic drivers are there?

>>1226779
>also consider it might not be designed to do anything more than 8 minutes. does it let you reset immediately or require cooldown or unplug cycle to restart?
OP, run it 8 minutes loaded, then feel what's hot & not on the bottom board

you may find out 10 minutes kills/melts something

>>1226790
It will let you run it immediately after its done a cycle unlike some toasters that pop up early the second or third time. It even lets you reset the time while it's still on. I've let it run for over an hour continuously before to no ill effect