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ICOM AD-55 power supply output voltage adjustment

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alpard:
Hi All

I checked my ICOM AD-55 output voltage, and it is 20V.
This is too abnormally high voltage I thought.

Is there ways to lower the voltage on the AD-55?

ThaDood:
Wow... Somethin' ain't right there. Well, open that up and look for, either an adjustment POT, or for cold solder joints by a Zener Diode, or an LM78##-like Voltage Regulator. Just for the heck of it, have you put it to a load, like a 12VDC light bulb, and measured the voltage under load? Not having that power supply myself, I'm just speculating, but hopefully enough to help.

alpard:
 I will open up the AD-55E, and see if I could see the voltage adjustment pot.

alpard:

--- Quote from: ThaDood on October 14, 2020, 1851 UTC ---Wow... Somethin' ain't right there. Well, open that up and look for, either an adjustment POT, or for cold solder joints by a Zener Diode, or an LM78##-like Voltage Regulator. Just for the heck of it, have you put it to a load, like a 12VDC light bulb, and measured the voltage under load? Not having that power supply myself, I'm just speculating, but hopefully enough to help.

--- End quote ---

Thank you for your advice.  I have opened up the AD-55E, and there was no pot to adjust the voltage. 

ChrisSmolinski:
Did you measure the AD-55 voltage under a load?

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