IBM B50 manual Information for Multiple Bus Systems

If the intended boot device is not listed in the NEW RESOURCE list, go to

"MAP 0290: Missing Resource Problem Resolution " in Diagnostics

Information for Multiple Bus Systems.

If an SRN, not an 8-digit error code, is reported, go to Diagnostics Information for Multiple Bus Systems.

If the diagnostics are successful, it may be necessary to perform an

operating system-specific recovery process, or reinstall the operating system. If unable to load standalone diagnostics:

a. Verify that the SCSI bus is properly terminated. b. Check the SCSI cabling.

c. It is possible that another attached SCSI device is causing the problem.

–Disconnect the signal and power cables from any other SCSI devices attached to the SCSI adapter that the CD-ROM drive is attached to.

–Try to boot the standalone diagnostics again.

–If unable to load standalone diagnostics, go to step 4.

–If standalone diagnostics load, one of the disconnected devices is

causing the problem, reconnect the devices one at a time. Retry the boot operation until the problem recurs and replace the device that caused the problem. If the problem appears to be one of the SCSI

devices, be aware it could be either the SCSI device or the SCSI

adapter. Go to "MAP 0410: Repair Checkout " in Diagnostics Information for Multiple Bus Systems.

4. It is possible that another installed adapter is causing the problem.

Remove all installed adapters except the one the CD-ROM drive is attached to and the one used for the console.

Try to boot the standalone diagnostics again.

If unable to load standalone diagnostics, go to step 5.

If standalone diagnostics load, reinstall adapters (and attached devices as

applicable) one at a time. Retry the boot operation until the problem recurs. Then replace the adapter or device that caused the problem (the system

board can also cause the device or adapter to fail). Go to "MAP 0410: Repair Checkout " in Diagnostics Information for Multiple Bus Systems.

5.Either the CD-ROM drive, SCSI adapter, the graphics adapter, or the system

board is most likely defective. A tty terminal attached to serial port 1 also can be used to determine if the graphics adapter is causing the problem. This is done by removing the graphics adapter, attaching a tty terminal to serial port 1, and retrying standalone diagnostics. If the standalone diagnostics load, replace the graphics adapter.

If the CD-ROM drive is attached to a SCSI adapter card rather than the integrated SCSI adapter on the system board:

–Replace the SCSI adapter.

–Replace the riser card.

3-287046 Model B50 Service Guide