IBM 5160 PSU 240V

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For more information, see this article's corresponding Wikipedia page: IBM Personal Computer XT.

Released as the IBM Personal Computer XT, or PC/XT, the 5160 is based around Intel's 8088 processor featuring 8-bit ISA slots for expansion cards. It came with one 5.25" floppy drive, and one 5.25" full height HDD most commonly 10MB. The PC/XT used a 130W power supply.

IBM Personal Computer XT (PC/XT)
Preliminary Information
Release Year 1983
Leak Risk Low
Batteries None
Capacitor Types Aluminium Electrolytic, Tantalum, Ceramic
Destructive Entry No

Known Issues

No Power

Power supply will not turn on.

Causes Solutions
1 No load. Power supply must have a load on it to activate. See https://minuszerodegrees.net/5150_5160/MDC/minimum_diag_config.htm for details, or build a test harness that loads the +5V and +12V outputs before assuming the PSU is itself at fault. See https://www.minuszerodegrees.net/5160/psu/5160_psu_line_ratings.htm for guidance on maximum loads.
2 The PSU has inbuilt protections to disable its LV outputs if the downstream boards are shorted. Check the downstream boards for shorts. There's plenty of info about the tantalum caps on the XT motherboard being a major cause of this. See https://minuszerodegrees.net
3 Electrolytic caps failing/failed. Recap the electrolytics using the parts list below
4 RIFA caps failed. Some PSU variations used RIFA caps at C1 and C2 on the AC input board which will fail rather aggressively. Always replace if present, failed or not.

Disassembly Notes

External Casing:

  • The external casing of the PC is held in place by five 1/4" hexagonal screws on the back plate. One in each corner and one in the top centre.
  • The external casing must be tilted up when pulled all the way forward to release.
  • Watch out for the speaker on the left side when sliding the casing.
  • The centre screw tab may catch on the PSU and cable (lift rear of case when sliding avoid).

PSU Removal and access:

  • PSU is held by four 1/4" hex screws to rear of PC case and two slides on bottom of PC case and needs to be slid toward front of PC to release.
  • The PSU case has two Torx T15H security screws in addition to the standard 1/4" hex screws.
  • When connecting the PSU back to the system the mother board power connectors P8 and P9 should have the black wires next to each other.

PSU internal disassembly:

  • Once the PSU is opened, there are four 1/4" hex screws that need to be undone to fully remove the main board, in addition to an earth wire and connector from the AC input board.
  • There are three sub-boards attached to the main PSU board that generally do not need to be disassembled to access all the electrolytic caps.
  • If there are RIFAs on the AC input board then that will also need to be removed from the main PSU case.

Original Parts

130W Power Supply Main Board

204-1071-03

  • PSU example 1

    PSU example 1

  • PSU example 1 board identifiers

    PSU example 1 board identifiers

  • Decapped PSU example 1

    Decapped PSU example 1

  • C3 on overcurrent sub-board (reversed polarity?). See note 2.

    C3 on overcurrent sub-board (reversed polarity?). See note 2.

  • PSU example 2

    PSU example 2

Notes:

  1. In the two PSU examples shown here, the three sub-boards extending towards the camera are left Voltage Windows, centre Overcurrent Monitor, right Inrush Limiter
  2. The polarity of the C3 cap on the Overcurrent sub-board appears to be marked incorrectly on the board. See picture above. Check and confirm before removing/replacing. Presumably the PSU functioned correctly for most of its life and the manufacturer knew to ignore the polarity marking for this cap.
  3. Capacitor designations are repeated on the sub-boards. i.e. there are multiple capacitors with a C1 designation printed on the different boards in the PSU etc.
Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Mount Diameter/Size Height Lead Spacing Temp Type Brand Series
C1 Inrush Limiter sub-board 1 100 µF 25V Through hole (radial) 7mm 12mm 3mm 105C Electrolytic Marcon CE-US (4WC?)
C2 Inrush Limiter sub-board 1 3.3µF 25V Through hole (radial) 5mm 12mm 2mm 105C Electrolytic Nichicon M
C2, C3 (see note 2 above) Overcurrent sub-board 2 1 µF 50V Through hole (radial) 5mm 12mm 2mm 105C Electrolytic KML
C3001 Voltage Window sub-board 1 47 µF 16V Through hole (radial) 6mm 12mm 3mm 105C Electrolytic Nichicon M
C25 1 2.2 µF 50V Through hole (radial) 5mm 12mm 2mm 105C Electrolytic Marcon CE-US (3VC?)
C10, C29 2 10 µF 16V Through hole (radial) 5mm 12mm 2mm 105C Electrolytic Nichicon M
C16, C17 2 10 µF 25V Through hole (radial) 5mm 12mm 2mm 105C Electrolytic Marcon CE-US (3XC?)
C27 1 22 µF 16V Through hole (radial) 5mm 12mm 2mm 105C Electrolytic Marcon CE-US (3YC?)
C5, C6 2 330 µF 16V Through hole (radial) 10mm 16mm 5mm 105C Electrolytic Marcon CL-US (4WB?)
C21 1 470 µF 25V Through hole (radial) 13mm 20mm 5mm 105C Electrolytic Nichicon M
C14, C15 2 470 µF 200V Through hole (radial, snap) 25mm 40mm 10mm 85C Electrolytic Matsushita CE
C9 1 1000 µF 25V Through hole (radial) 16mm 25mm 8mm 105C Electrolytic KML M(?)
C7, C8 2 2200 µF 10V Through hole (radial) 16mm 25mm 8mm 105C Electrolytic Matsushita CE GM
C11 1 4700 µF 16V Through hole (radial) 18mm 35mm 8mm 105C Electrolytic Marcon CE-US (4PB?)
C1, C2 - AC input board 2 0.1uF ? ? ? ? RIFA paper ...any...

Replacement Parts

130W Power Supply Main Board

Element14 is the Australian distributor previously known as Farnell.

Important Note: I put this list together using the local Element14 website for Australia however after ordering I rapidly become aware they don't have a lot of local stock. Despite selecting the option for the shipment to be delivered as a single package once they had received the overseas components, Element14 shipped the Australian, US and UK stocked items separately, thereby tripling the postage. In addition, they didn't have one item that was listed as stocked thereby forcing me to source from another outlet thus incurring even more postage. Their after-sales service sent me emails that were demonstrably untrue and they ignored my repeated request to consolidate the remaining two packages after the first one had shipped with a single $1 cap. I ended up paying around $60 postage for $37 worth of caps. I suspect their business model is to make money on postage as the margins on caps must be pretty thin. I can not recommend them as a source of caps in Australia.

Capacitors
RefDes Qty Compatible Part Number Order Links
C1 Inrush Limiter sub-board 1 PANASONIC  EEUFM1H101BJ DigiKey Mouser Element14
C2 Inrush Limiter sub-board 1 PANASONIC EEUEB1H3R3S DigiKey Mouser Element14
C2, C3 Overcurrent sub-board 2 RUBYCON 50YXF1MEFC5X11 DigiKey Mouser Element14
C3001 Voltage Limiter sub-board 1 PANASONIC ECA1CHG470 DigiKey Mouser Element14
C25 1 PANASONIC EEUEB1H2R2S DigiKey Mouser Element14
C10, C29, C16, C17 4 PANASONIC EEAFC1E100 DigiKey Mouser RS Online
C27 1 PANASONIC ECA1CHG220 DigiKey Mouser Element14
C5, C6 2 PANASONIC EEUFC1E331B DigiKey Mouser Element14
C21 1 PANASONIC EEUEB1H471 DigiKey Mouser Element14
C14, C15 2 Nichicon LLS2D471MELZ DigiKey Mouser Element14
C9 1 PANASONIC EEUFC1E102SB DigiKey Mouser Element14
C7, C8 2 PANASONIC EEUFK1C222S DigiKey Mouser Element14
C11 1 PANASONIC EEUFK1C472S DigiKey Mouser Element14
C1, C2 - AC Inpout board 2 ? ?

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.

Related Links

See https://minuszerodegrees.net/5160/psu/5160_psu.htm for additional information

See https://minuszerodegrees.net/5150_5160/MDC/minimum_diag_config.htm for how to confirm faulty PSU

See https://slx-online.biz/hursley/docs/5155_psu.pdf by Dr H.Holden for a comprehensive breakdown of a 5155 PSU that is very similar. This is absolute gold.

References

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