Table 38.
System Model Name of FRU
to Exchange
FRU Position Link to Locations
Diagram
Link to Failing
Component Service
Information. (CCIN,
PN, Removal and
Installation
Procedure)
Models 830
and SB2
System Unit
Backplane
MB1 “Locations —
Models 830, SB2
System Unit with
FC 9074 Base I/O
Tower” on
page 709.
Table 41 on
page 710.
Models 840
and SB3
System Unit
Backplane /
Processor
Tower
Backplane
MB1 “Locations —
Models 840, SB3
System Unit with
Processor Tower
and FC 9079 Base
I/O Tower” on
page 719.
Table 42 on
page 720.
This ends the procedure.
SYSUNIT
The failing item is the system processor hardware subsystem.
The system processor (System Unit) has failed and the diagnostic software was not
able to isolate the failure to a FRU.
1. Attempt a SLOW OVERRIDE IPL to run full processor hardware diagnostics.
Power off the system from the control panel. Change the IPL mode to manual,
and the IPL speed to SLOW OVERRIDE (S) using control panel function 2.
Power on the system.
Does the same SRC occur ?
Yes No
↓ Follow the service actions for the new SRC.
2. Is this system a Model 830 with SB2 System Unit and FC 9074 ?
Yes No
↓ Go to Step 4 on page 600 of this procedure.
3. See “Locations — Models 830, SB2 System Unit with FC 9074 Base I/O
Tower” on page 709.
Replace the following FRUs in order one at a time until the problem is
resolved. See “Chapter 4. Removal and Installation Procedures” on page 617.
Note: Be sure to IPL in SLOW OVERRIDE mode after each replacement.
a. Clock Card in location M06A
b. network interface controller (NIC) card in location M06
c. Processor Regulator Card in location M01
d. Processor Card in location M03
e. Processor Card in location M04
f. Power Supply in location PP1
g. Power Supply in location PP2
Symbolic FRUs
Chapter 3. Problem Isolation Procedures (PIPs), Failing Items, and Symbolic FRU Isolation 599
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