IBM 6H0, Service Manual

Page: 115 / 561

Step 1521-13
Check internal drawer cabling from power distribution card to primary I/O backplane.
See “Primary I/O Drawer Internal Cables” on page 481 in Chapter 10.
Replace the following in the primary I/O drawer, one at a time, disconnecting the ac
power cable to each power supply before replacement and reconnecting the ac power
cable to each supply after replacement:
v Primary I/O drawer operator panel
v
Power supply (including redundant power supply, if present)
v
Primary I/O drawer backplane
Does the Primary I/O Drawer Operator Panel Show the OK Prompt?
NO Contact your next level of support for assistance.
YES This ends the procedure. Go to
″
Map 0410: Repair Checkout
″
in the
Diagnostics Information for Multiple Bus Systems .
Step 1521-14
Is the ac power cable from the rack power distribution unit to the customer’s ac
power outlet connected and seated correctly at both ends?
NO Connect the ac power cable correctly at both ends.
This ends the procedure. Go to
″
Map 0410: Repair Checkout
″
in the
Diagnostics Information for Multiple Bus Systems .
YES Go to “Step 1521-15.”
Step 1521-15
Note: Read the Danger and Caution notices under “Safety Notices” on page xi before
continuing with this procedure.
Perform the following:
1. Disconnect the mainline ac power cable from the power distribution unit that
supplies power to the primary I/O drawer.
2. Use a multimeter to measure the ac voltage at the power distribution unit end of the
mainline ac power cable.
Is the ac voltage from 200 V ac to 240 V ac?
NO Go to “Step 1521-16” on page 96.
YES Replace the power distribution unit.
This ends the procedure. Go to
″
Map 0410: Repair Checkout
″
in the
Diagnostics Information for Multiple Bus Systems .
Chapter 3. Maintenance Analysis Procedures
95