Apple IIe Aftermarket PSU (Delta Electronics)

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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

Related Links

References