Electronic – AC-DC Adapter – Output lower than rating and what’s this ‘cont’ output for

ac-dcadaptervoltage

I have a Canon AC adapter, Model K30321, that I'd like to use in a project. I'm attempting to test the adapter for correct voltage output.

Adapter specs:

Input Voltage: 100 - 240VAC ~ 50/60Hz 60VA 0.65A
Output: 24V === 1A
Connector: 3 pin rectangle white flat 1 [ ■ ■ ■ ] 3
(from Left to right)
Pin1 = + 24v
Pin2 = Cont
Pin3 = GND

When I connect my multimeter to pin 1 and pin3, I see only about 8V DC.
I also see the same voltage between pin 2 and pin 3.

After some experimentation, I've learned that applying a constant 3.3V DC to the control pin causes the pin 1 voltage to rise and fall periodically between ~19V DC and ~21V DC. I can also hear a clicking sound coming from the adapter when doing this.

Questions:
I'm wondering if the control pin needs a PWM applied to it to function, or maybe it's expecting something else?

Thanks for all the advice!

Best Answer

Probably a control input to put the adapter into standby mode so the printer uses less total power when in standby.

You might be able to coerce the adapter into giving you 24V by grounding the CONT line (use a few K resistor in series, just in case).

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