Apple IIe Aftermarket PSU (Delta Electronics): Difference between revisions

From Caps Wiki
Jump to navigation Jump to search
VisualWikitext
Line 17: Line 17:


==Disassembly Notes==
==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.  
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==
==Original Parts==
Line 23: Line 25:
''Underside stamped with "MW 302 AP".  "Delta Electronics" name found on back of NEMA plug.''
''Underside stamped with "MW 302 AP".  "Delta Electronics" name found on back of NEMA plug.''


Capactiances are in microfarads (µF) '''''unless otherwise noted'''''
'''Table Notes'''


Dimensions are in millimeters (mm)
* Capactiances are in microfarads (µF) '''''unless otherwise noted'''''
 
* Dimensions are in millimeters (mm)
Temperatures are in degrees Celsius (°C)  
* Temperatures are in degrees Celsius (°C)  
{| class="wikitable sortable"
{| class="wikitable sortable"
|+Capacitor [[Capacitor Specifications|Specifications]] and  [[Part Footprints|Footprint]] Information  
|+Capacitor [[Capacitor Specifications|Specifications]] and  [[Part Footprints|Footprint]] Information  
Line 132: Line 134:
==Replacement Parts==
==Replacement Parts==
===Power Supply PCB===
===Power Supply PCB===
{| class="wikitable sortable"
Replace original parts in kind.  See Digikey BOM in Kits section for an example list. 
|+Capacitors
 
!RefDes
'''''Recommendations'''''
!Qty
 
!Compatible Part Number
* Maintain lead spacing
!Order Links
* Maintain / reduce diameter
|-
* Prefer 105 °C or greater temperature ratings.
|
* Prefer low ESR caps for DC voltage output (C16, C17, C20, C21)
|
|
|[https://www.digikey.com/ Digikey]
|}
''If parts are not available or different selection is preferred, you can use the values in the [[#Original_Parts|Original Parts]] section to perform a parametric search.''


===Kits===
===Kits===
Line 151: Line 148:
==Related Links==
==Related Links==


*[https://www.youtube.com Videos or other things that might be helpful to check out]
*[https://www.youtube.com/watch?app=desktop&v=tNIjMOF5sx4 YouTube - Chris Torrence Assembly Lines #44: Apple II PSU Testing]  


==References==
==References==

Revision as of 15:27, 11 April 2022

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 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)
Capacitor Specifications and Footprint Information
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)

Kits

Related Links

References

Retrieved from "https://caps.wiki/index.php?title=Apple_IIe_Aftermarket_PSU_(Delta_Electronics)&oldid=2327"