Apple IIe Aftermarket PSU (Delta Electronics)

For more information, see this article's corresponding Wikipedia page: Device.

Delta Electronics Apple IIe power supply (external)

This is the page for the Delta Electronics MW 302 AP aftermarket power supply for the Apple IIe

Power supply should normally output voltages specified on outer casing (+/-5VDC and +/-12VDC) in an unloaded condition.

Known Issues

Non functional / clicking when powered on

NOTE: Many Apple IIe power supplies (Astec branded) "click" when powered on if they're disconnected from the motherboard and will not provide proper output voltages when unloaded. Some, however, provide constant output regardless. Limited experience with aftermarket PSU's suggest a constant output is to be expected.

Causes

• Blown / failed electrolytic capacitors

Solutions

• Replace electrolytic capacitors

Disassembly Notes

Seven screws to disassemble case. Will need to remove power switch from end to remove board from enclosure. Desolder wires from NEMA plug connection to separate completely.

Original Parts

Power Supply PCB

Underside stamped with "MW 302 AP". "Delta Electronics" name found on back of NEMA plug

Capacitor Specifications and Footprint Information µF 85 °C

RefDes	Qty	Capacitance	Voltage	Diameter/Size	Height	Lead Spacing	Temp	Type	Brand
C!	1	0.1 µF	250VAC	17.8mm	12.5mm	15.6mm	0 °C	Film	ISKRA
C2, C3	2	4700 pF	250VAC	13mm	11mm	10.5mm	0 °C	Film	ISKRA
C4, C5	2	100 µF	200V	16.2mm	33mm	7.8mm	85 °C	Electrolytic	Jamicon
C6	1	100 µF	25V	6.6mm	11.6mm	3.4mm	85 °C	Electrolytic	N/A
C7, C8, C12	3	10 µF	63V	5.2mm	11.2mm	2.9mm	85 °C	Electrolyitic	N/a

Replacement Parts

Power Supply PCB

Capacitors

RefDes	Qty	Compatible Part Number	Order Links
			Digikey

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.

Kits

• Digikey BOM: https://www.digikey.com/

Related Links

• Videos or other things that might be helpful to check out