Apple IIe Aftermarket PSU (Delta Electronics)
- For more information, see this article's corresponding Wikipedia page: Device.
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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 Line, Neutral, and Ground wires from NEMA plug connection to separate board from case completely.
Original Parts
Power Supply PCB
Underside stamped with "MW 302 AP". "Delta Electronics" name found on back of NEMA plug.
Table Notes
- Capactiances are in microfarads (µF) unless otherwise noted
- Dimensions are in millimeters (mm)
- Temperatures are in degrees Celsius (°C)
| RefDes | Qty | Capacitance | Voltage | Diameter/Size | Height | Lead Spacing | Temp | Type | Brand |
|---|---|---|---|---|---|---|---|---|---|
| C! | 1 | 0.1 | 250VAC | 17.8 | 12.5 | 15.6 | 0 | Film (PP) - X2 | ISKRA |
| C2, C3 | 2 | 4700 pF | 250VAC | 13 | 11 | 10.5 | 0 | Film (PP) - Y | ISKRA |
| C4, C5 | 2 | 100 | 200 | 16.2 | 33 | 7.8 | 85 | Electrolytic | Jamicon |
| C6 | 1 | 100 | 25 | 6.6 | 11.6 | 3.4 | 85 | Electrolytic | N/A |
| C7, C8, C12 | 3 | 10 | 63 | 5.2 | 11.2 | 2.9 | 85 | Electrolyitic | N/A |
| C13, C14, C15, C16, C17 | 5 | 1000 | 16 | 13 | 25.8 | 5.8 | 105 | Electrolytic | N/A |
| C18, C20, C21 | 3 | 220 | 16 | 8.3 | 12 | 3.5 | 85 | Electrolytic | N/A |
| C19 | 1 | 470 | 16 | 10 | 15 | 5.4 | 105 | Electrolytic | N/A |
Replacement Parts
Power Supply PCB
Replace original parts in kind. See Digikey BOM in Kits section for an example list.
Recommendations
- Maintain lead spacing
- Maintain / reduce diameter
- Prefer 105 °C or greater temperature ratings.
- Prefer low ESR caps for DC voltage output (C16, C17, C20, C21)
Basic PCB Name
| RefDes | Qty | Compatible Part Number | Order Links |
|---|---|---|---|
| C! | 1 | 890324025017CS / MP2104K27D2R8LC | DigiKey Mouser LCSC |
| C2, C3 | 2 | CMPPAC310V472K10S5 / MP2472K27C2R6LC | DigiKey LCSC |
| C4, C5 | 2 | EKXJ251ELL101ML20S | DigiKey Mouser |
| C6 | 1 | 25ZL100MEFCT16.3X11 | DigiKey Mouser |
| C7, C8, C12 | 3 | ECA-1JHG100I | DigiKey Mouser |
| C13, C14, C15, C16, C17 | 5 | 16YXJ1000MT810X16 | DigiKey Mouser |
| C18, C20, C21 | 3 | 860010373010 | DigiKey Mouser |
| C19 | 1 | 16YXF470MEFCT810X12.5 | DigiKey Mouser |
Kits
- Digikey BOM: https://www.digikey.com/short/22pwn3bz