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SGI O2+ General Maintenance

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SGI O2+ power supply release (SGI drawing)
Releasing the O2+ power supply: with its bezel off, the yellow lever slides to the right (SGI, O2+ hardware reference guide, Figure 5-38)

Routine care and module procedures for the SGI O2+, from SGI's Silicon Graphics O2+ Workstation Hardware Reference Guide (007-4486-001).[1] The O2+ is built on the O2's chassis, and SGI's note on the model lists only its memory, disk, processor and colour as changes, so the community's O2 maintenance notes on SGI O2 General Maintenance apply to it as well.[2] The procedures below are the ones SGI wrote for the O2+, which cover two versions: RM7000-class and R12000-class.[3]

Siting and cleaning

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SGI's limits for the O2+ are 10 to 35 °C and 10% to 80% relative humidity in use, and −40 to 65 °C and 5% to 90% in storage, non-condensing.[4] The site preparation guide adds a maximum rate of change of 10 °C an hour for a running O2.[5]

  • Keep the ventilation slots and openings clear, and do not place the machine on or near a radiator or heater, or in an enclosed cabinet without ventilation.[6]
  • Unplug the machine before cleaning it. SGI says not to use liquid or aerosol cleaners, only a damp cloth.[6]
  • The power supply holds the machine's fan.[7] Keep its grille free of dust.

Before opening the machine

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  • Switch off with the power button on the front, then unplug the power cable from the back. SGI's caution is always to remove the power cable before taking out the system module.[8]
  • Static builds up when you walk about or stand up, so SGI asks you to stay in one place until the work on the system module is finished.[8]
  • Wear the wrist strap, clipped to the PCI tray or a bare metal part of the chassis.[9]

System module

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The system module is the left-hand module as you face the back of the machine.[8]

  1. Switch off and unplug the power cable.
  2. Pull down the lever on the left side of the module to release it.
  3. Slide the module out of the chassis and lay it on a clean, flat surface. The cables can stay connected if you handle the module carefully, but it is easier to work with them removed.[8]

To refit it, stand it upright, slide it in until the lever engages, and push the lever up to lock it. When it is home, the lever is fully up and the module is flush with the system drive module and the other modules. Reconnect the power cable last.[10]

The circuit board beneath the PCI tray carries a chip holding the workstation's serial number. SGI's procedure for fitting a replacement system module moves the DIMMs and the whole PCI tray, with any PCI board still in it, to the new module.[11]

Memory

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The O2+ has eight DIMM sockets in four banks of two.[9]

  • Sockets 1 and 2 must always be filled; the minimum is two 128 MB DIMMs, 256 MB in all.
  • Put the highest-density DIMMs in the lowest sockets, sockets 1 and 2.
  • Fit DIMMs in pairs of the same capacity, filling banks in order from the lowest open socket. Each bank is either full or empty.[9]

Hold each DIMM over its socket without tilting it and push it straight down until it clicks and the latches at both ends snap up. Then check that every DIMM stands vertical and that the latches sit snugly against it.[12] After refitting the module, check the memory total under System Manager, About This System.[13]

CPU module

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  • RM7000-class: release the PCI tray by pushing up the lever on its side, press down slightly on the rear of the tray and lift it out without removing its board. Remove the two Phillips screws holding the CPU module and rock it out gently by both sides, without bending the pins. A new module clicks into place when pressed down onto its connector.[14]
  • R12000-class: remove the plastic faceplate from the system module, held by five screws on the back and two underneath. Leave the third screw underneath, which holds the lever to the faceplate. Disconnect any cables from the PCI board, release the PCI tray by twisting a screwdriver in the small opening shown in SGI's figure and lift the tray straight up, then remove the four Phillips screws holding the CPU module. Leave the four hex screws, the heat sink and the two screws holding the fan in place.[15]

Drives

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The system disk sits in its own module: pull down the lever on its left side, slide the module out, and lock a replacement in by pushing the lever up.[16] Only the RM7000-class O2+ takes a second internal drive.[17] See also Hard Drive Maintenance and Repair.

If the CD-ROM eject button does not work, a straightened paper clip pushed into the small hole beneath it releases the tray. Replacing the drive means removing the drive's faceplate, the power supply bezel and the outer covers.[18]

Power supply

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Warning: the supply works at mains voltage inside. If you open one, unplug it first and check with a meter that its capacitors have discharged before touching the boards.

  1. Switch off and unplug the power cable.
  2. Press the latch at the top of the power supply bezel; the bezel swings out towards you. Lift it off.
  3. Slide the lever to the right to release the supply.
  4. Pull the supply out by its pull ring.
  5. Slide the replacement in until it stops, push the lever to the left until it clicks, refit the bezel by its bottom tabs and snap it up into place, then reconnect the power cable.[19]

Battery

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The O2+ motherboard carries a lithium battery. SGI's warning is that a wrongly fitted battery can explode, and that it must be replaced only with the same or an equivalent type.[6] An IRIXNet member who rebuilds SGI supplies states that the O2 and the Octane use the same Dallas real-time clock module; see SGI Octane General Maintenance#Real-time clock and identification module for that module.[20]

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References

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  1. ↑ Silicon Graphics, Silicon Graphics O2+ Workstation Hardware Reference Guide, 007-4486-001, January 2002 (File:SGI O2+ Workstation Hardware Reference Guide (007-4486-001).pdf).
  2. ↑ Silicon Graphics, Important Note: Silicon Graphics O2+ Hardware Documentation, 007-4473-001, 2001 (File:SGI O2+ Hardware Documentation Important Note (007-4473-001).pdf).
  3. ↑ SGI, 007-4486-001, pp. 3-4, Figures 1-2 and 1-3. RM7000-class and R12000-class rear views.
  4. ↑ SGI, 007-4486-001, appendix A, Table A-19, p. 208.
  5. ↑ Silicon Graphics, Site Preparation for SGI 2000-Series, Origin Family, Onyx2, Octane, and O2, 007-3452-004, p. 30, Table 3-1 (File:SGI Site Preparation for SGI 2000-Series, Origin, Onyx2, Octane and O2 (007-3452-004).pdf).
  6. ↑ 6.0 6.1 6.2 SGI, 007-4486-001, pp. 183-184. Lithium battery statement and safety instructions.
  7. ↑ SGI, 007-4486-001, glossary, "power supply": it contains the power switch, reset button and fan.
  8. ↑ 8.0 8.1 8.2 8.3 SGI, 007-4486-001, pp. 27-31. Removing the system module.
  9. ↑ 9.0 9.1 9.2 SGI, 007-4486-001, pp. 33-35. Installing memory modules; wrist strap; DIMM rules.
  10. ↑ SGI, 007-4486-001, pp. 69-72. Reinstalling the system module.
  11. ↑ SGI, 007-4486-001, p. 119. Replacing the system module.
  12. ↑ SGI, 007-4486-001, pp. 35-36. Seating and checking DIMMs.
  13. ↑ SGI, 007-4486-001, p. 73. Verifying the hardware installation.
  14. ↑ SGI, 007-4486-001, pp. 120-126. Replacing the RM7000-class CPU module.
  15. ↑ SGI, 007-4486-001, pp. 126-136. Replacing the R12000-class CPU module.
  16. ↑ SGI, 007-4486-001, pp. 137-141. Replacing the system drive.
  17. ↑ SGI, 007-4486-001, pp. 75-90. Second internal hard drive, RM7000-class only.
  18. ↑ SGI, 007-4486-001, pp. 158-163. Opening the CD-ROM tray by hand; removing the covers to replace the drive.
  19. ↑ SGI, 007-4486-001, pp. 149-157. Replacing the power supply.
  20. ↑ weblacky, "Octane PSU repair / Cherokee...", IRIXNet forum thread 4349, 14 October 2024, forums.irixnet.org/thread-4349.html. The O2 and Octane use the same Dallas clock module.


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