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Step 1523-4
Use the information in the "I/O Drawer and Power Supply LED Status" on page 28 to
answer the following question.
Is the power supply LED blinking quickly?
NO
YES
Step 1523-5
Is there a power supply with a flashing LED?
NO
YES
Step 1523-6
Are both I/O drawer power supply LEDs flashing?
NO
YES
Check the SPCN cabling.
Check internal drawer cabling from power distribution card to primary I/O
backplane. See "Primary I/O Drawer Internal Cables" on page 483 in Chapter
10.
Replace the I/O drawer power supply.
Replace the secondary I/O drawer backplane.
Replace the I/O drawer power distribution card.
This ends the procedure. Go to "Map 0410: Repair Checkout" in the
Diagnostics Information for Multiple Bus Systems
Replace the power supply with the flashing LED.
This ends the procedure. Go to "Map 0410: Repair Checkout" in the
Diagnostics Information for Multiple Bus Systems
Go to "Step 1523-7" on page 106.
Go to "Step 1523-6".
Replace the power supply with the flashing LED.
This ends the procedure. Go to "Map 0410: Repair Checkout" in the
Diagnostics Information for Multiple Bus Systems
Check internal drawer cabling from power distribution card to primary I/O
backplane. See "Primary I/O Drawer Internal Cables" on page 483 in Chapter
10.
Replace the following one at a time:
1. secondary I/O drawer backplane
2. power distribution board
This ends the procedure. Go to "Map 0410: Repair Checkout" in the
Diagnostics Information for Multiple Bus Systems
Chapter 3. Maintenance Analysis Procedures
105
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