The Apple IIc external power supply (A2M4017) doesn't have a non-destructive way of being taken apart, so if it dies a replacement is likely needed.
Here is a guide on how to make a replacement power supply.
The Apple IIc manual states that it operates at 12v~15v. Maximum power consumption is listed at 25w. My recommendation is to use a 12v 3A power supply.
For the plug you will need a female DIN 7 pin socket connector.
If your power supply has a ferrite bead as in the above picture, be sure to cut off the connector after the bead, the bead helps reduce noise.
Use an exacto knife to cut the plastic cover back about 10mm, as shown here:
One issue I came across is that the pins on the IIc are thicker then average, so you will very likely have issues with getting the plug in and out.
To fix this we need make the pin spacing in the female DIN wider before soldering the wires.
Take out all the pins from the female connecter. User a screwdriver to widen the spacing on four pins, as shown in the image. Place the four pins back in as shown in image, don't put the other three back in, they're not needed. Test it in your IIc to make sure you can slide the plug in and out with ease.
Lastly, solder the power cable. The +12 get connected to two pins and ground gets connected to the other 2 pins, as shown in image below.
Here is your final product:
Here is a guide on how to make a replacement power supply.
The Apple IIc manual states that it operates at 12v~15v. Maximum power consumption is listed at 25w. My recommendation is to use a 12v 3A power supply.
For the plug you will need a female DIN 7 pin socket connector.
If your power supply has a ferrite bead as in the above picture, be sure to cut off the connector after the bead, the bead helps reduce noise.
Use an exacto knife to cut the plastic cover back about 10mm, as shown here:
One issue I came across is that the pins on the IIc are thicker then average, so you will very likely have issues with getting the plug in and out.
To fix this we need make the pin spacing in the female DIN wider before soldering the wires.
Take out all the pins from the female connecter. User a screwdriver to widen the spacing on four pins, as shown in the image. Place the four pins back in as shown in image, don't put the other three back in, they're not needed. Test it in your IIc to make sure you can slide the plug in and out with ease.
Lastly, solder the power cable. The +12 get connected to two pins and ground gets connected to the other 2 pins, as shown in image below.
Here is your final product:
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