Map 1540: 7012 Minimum Machine Configuration - IBM 7012 300 Series Installation And Service Manual

MAP 1540: 7012 Minimum Machine Configuration

Notes:
This MAP is used to locate defective FRUs not found by normal diagnostics. For this
procedure, diagnostics are run on a minimum-configured system. If a failure is detected on
the minimum-configured system, the remaining FRUs are exchanged one at a time until the
failing FRU is identified. If a failure is not detected, FRUs are added back until the failure
occurs. The failure is then isolated to the failing FRU.
The MAP steps on the following pages instruct you to reduce the system to one or more of
the following configurations:
Note: Refer to "Reading Flashing 888 Numbers" in the Diagnostic Information For Micro
System planar, CPU card (Model 39H without memory SIMMs), key mode/reset switch,
voltage regulator card (Model 39H), and the three-digit display panel.
If no failure is detected, a 213 or the flashing 888 sequence "888-103-12X-X43" (X can
be any number) is displayed in the three-digit display. Any other response means one of
the remaining FRUs is failing.
System planar, CPU card, key mode/reset switch, the three-digit display panel, and
memory cards.
If no failure is detected, two or more numbers between 221 and 296 alternate in the
three-digit display or a solid 262 will be displayed (see page in the Supplement). Any
other response means one of the remaining FRUs is failing.
System planar, CPU card, key mode/reset switch, the three-digit display panel, memory
cards, diskette drive, and a terminal attached to a serial port or a keyboard, display, and
graphics adapter.
If no failure is detected, the Operating Instructions frame is displayed when the
diagnostics are loaded and the system console is selected. Any other response means
one of the remaining FRUs is failing.
1. This is not a start of call MAP. You should use these MAPs only if you have been
directed here from a MAP step in the POWERstation and POWERserver
Common Diagnostics and Service Guide.
2. All information in this MAP pertaining to 7012 Model 397 also applies to 7030
Model 397.
Channel Bus Systems for information about reading flashing 888 sequences.
On the Model 39H, the memory SIMMs are located on the CPU card. Memory must
be installed in pairs and the amount of memory installed on the CPU card must be
equal to the amount of memory installed on the memory card.
Maintenance Analysis Procedures
2-1540-1