Base Unit System Planar - IBM 7012 G Series Service Manual

Base Unit System Planar

The system planar and operator panel EEPROMs contain the SYSID of the system.
When one of the two components is to be replaced (for example the system planar), the
SYSID information will be copied from operator panel EEPROM into the system planar
EEPROM when you at start the system.
To avoid losing this information, it is not possible to replace both components at the same
time.
When both components are to be replaced, proceed as follows:
1. First substitute the operator panel and start up the system: the SYSID information will be
copied from system planar EEPROM to the operator panel EEPROM.
2. Substitute the system planar and start up the system: the SYSID information will be
copied from operator panel EEPROM to the system planar EEPROM.
Removal
Note: Removal and replacement procedure of the system planar requires that most system
components are removed. All the procedures are illustrated earlier in this chapter.
Remove all the system items in the following order; then reinstall them in reverse
order.
1. Remove the front cover, the side cover, and the rear cover of the unit following the
procedures described in "Front Cover" on page 4-3, "Side Cover" on page 4-6, and "Rear
Cover" on page 4-8.
2. Disconnect any cable connected to the Micro Channel adapters installed in the base unit.
Record which cable attaches to which adapter.
3. Put the system unit in horizontal position.
4. Remove any Micro Channel adapter installed in the unit using the procedure on page
4-14.
5. Remove the cards retainers using the procedure on page 4-22.
6. Disconnect both the SCSI cable and the power cable from each disk drive installed in the
unit.
7. Remove the disk drive support tray(s), using the procedure on page 4-24.
8. Remove the CPU card(s) using the procedure on page 4-34.
9. Remove the memory card using the procedure on page 4-36.
10.Remove the front fan using the procedure on page 4-20.
11. Remove the battery using the procedure on page 4-42.
12.Note the location and disconnect any cable connected to the system planar.
13.Remove the retaining screws used to secure the planar to the unit.
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Service Guide