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Old 01-07-2022, 07:57 PM   #8
R_J
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Join Date: Jun 2012
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Default Re: Need some help with Epson Printer Power Supply.

The voltage measure across C12 is wrong, it is obvious you used the secondary ground and not the hot ground. 165 volts across C12 would mean the cap and the ic would be in orbit.
Yes you have a short on the +42 volts. Is this short only when the main board is connected? because if it is I am supposed that the fuse F51 didn't open.

If you look at the primary side, C11 negative is HOT or PRIMARY ground. it is not connected to the secondary ground. So when checking voltages in the primary side of T1 you must use hot ground.
Is there a schematic for the main board?

Last edited by R_J; 01-07-2022 at 08:04 PM..
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