IBM PS/2 P70 PSU

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

Preliminary Information
Leak Risk	High
Batteries	None
Destructive Entry	No

Known Issues

Symptom or Problem Encountered

Causes

• Computer powers up normally and POSTs when turned on after being off for a period of time. If it is turned off and turned on again in short time frame, screen and power light blinks for a second and goes off. No shorts seen on motherboard or through power supply connector

Solutions

• Full recap of power supply solved this issue and computer starts normally every time. Notably there were no visually obvious bad caps.

Disassembly Notes

- Rivets will need to be drilled out

Rivet locations pictured; two on either end, and one near the fan mount. Five 1/8" diameter rivets are needed.

Rivet Locations, rivet closest to the switch has a spacer.

Original Parts

Basic PCB Name

Capacitor Specifications and Footprint Information

RefDes	Capacitance	Voltage	Mount	Diameter/Size	Height	Lead Spacing	Temp	Type	Brand	Series
C009	2.2 µF	400V
C014	47 µF	50V
C016	390 µF	250V
C017	390 µF	250V
C021	2.2 µF	50V
C023	33 µF	25V
C024	1 µF	50V
C103	330 µF	35V
C104	1800 µF	10V
C105	33 µF	250V
C106	1800 µF	10V
C109	1800 µF	10V
C111	47 µF	35V
C112	100 µF	25V
C113	470 µF	16V
C114	1800 µF	10V
C118	10 µF	50V
C120	10 µF	50V
C121	10 µF	50V
C122	2.2 µF	50V
C123	330 µF	25V
C124	2.2 µF	50V
C128	470 µF	16V
C137	10 µF	250V
C204	2.2 µF	50V

Replacement Parts

Basic PCB Name

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.