IBM System/36 Maintenance Information Manual page 22

B1 Feature Board FRU Isolation Procedure 156
1. Unplug all feature cards from the B1 board except for the lOP feature card (B1-A) and the main storage
card (B1-G). IPL the system with wraps (1-0000). If an SRC of 6300 through 6355 is displayed on the
system console, the following FRUs are suspect:
• lOP feature card B1-A
• Main storage card B 1-G
• Feature power supply
• B1 feature board
If an SRC in the range indicated above is not displayed on the system console, continue with step 2.
2. Install the feature cards, one at a time. IPL the system with wraps (1-0000). If an SRC in the range of
6300 to 6355 is displayed on the system console, the feature card just installed is defective.
3. Repeat step 2 for each feature card until the failing card has been isolated.
160 Isolating Main Storage Problems
Note: Unless instructed not to, always power off the 5363 before removing, exchanging, or installing a FRU.
If an SRC indicates a Main Storage error, perform the following procedure:
1. Exchange the main storage card. (B1-G)
2. Load the system from Diskette 61:
a. Select function 3 (IPL Diagnostic Diskette).
b. Enter FA03.
c. Press the Start Function key.
3. Wait until the output display light is on with FA03 displayed. If a failure occurs, continue with step 4.
If no failure occurs, go to "105 System Entry Procedure" on page 1-2.
4. Repeat steps 1 through 3 exchanging the following FRUs in this sequence:
a. AIJ2 (MSP Data Flow)
b. A1H2 (MSP Control)
5. If a failure still occurs, either the Al or B1 board is defective.
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5363 Maintenance Information