Cap upgrade Conion c100f then not working

[caution]

Those are switches inside the power jack that redirect ground depending on if you have AC or DC plugged in.
The upper switch moves when you plug in AC, so it redirects ground from the batteries and DC plug over to the transformer.
The lower switch moves when you insert a DC barrel plug, so it disconnects ground from the batteries.

The AC switch takes precedence over the DC switch, so if you happen to plug both AC and DC in, AC wins.

The AC switch is strictly a switch. The AC plug pushes down on a plastic piece attached to the switch.
The DC switch's moving part (pin 4) has two jobs: it's metallic, and creates the connection to ground against the side of the DC plug.
It also disconnects the ground connection to the batteries.

 

[keeney123]

Those are switches inside the power jack that redirect ground depending on if you have AC or DC plugged in.
The upper switch moves when you plug in AC, so it redirects ground from the batteries and DC plug over to the transformer.
The lower switch moves when you insert a DC barrel plug, so it disconnects ground from the batteries.

The AC switch takes precedence over the DC switch, so if you happen to plug both AC and DC in, AC wins.

The AC switch is strictly a switch. The AC plug pushes down on a plastic piece attached to the switch.
The DC switch's moving part (pin 4) has two jobs: it's metallic, and creates the connection to ground against the side of the DC plug.
It also disconnects the ground connection to the batteries.

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Thank you again Caution. I had no idea that the AC plug had a switch in it. I understood the external dc can have a pressure switch. I just did not expect the AC plug having a switch also. It makes sense now. One has to focus on the AC switch or the pin 1 and 2 connections. If it connects and has a resistance in the connection the return line will drop a voltage at that connection.

 

[keeney123]

I am a little confused. I know the Transformer board is alright. I touched up the solder joints and now get 20.1Volts out of it. I was confused at first on the power board because someone had made the orange wire going to the ground of the battery holder. I just relabeled it as ground. I also know that when I put negative lead of the meter to where the black wire goes and the red lead of the meter where the red wire goes, I get +20 volts.

Here is the problem. With both switches in the off state, I measure in ohms on the lowest scale 1 ohm or less from the red wire that would connect to the power board to where the cathode or the LEDs on the power/ alarm board. Here is the confusion on the power/alarm board the red wire is connected to the J2003 that is listed as r and the black wire is connected to the B. Looking from the back top side of the power/alarm board where the top of the switches is the red wire is on the right-hand side and the black wire is on the left-hand side. Turning the board over one can see that this connects directly to the cathode of the leds. Am I missing something here or is the board marked wrong or are they running ground at -20 Volts DC?