IBM B50 - Manual (Page 51)

Step 1540-5
No failure was detected with this configuration.
1. Turn off the power.
2. Install a memory module.
3. Turn on the power.
Does the operator panel do one of the following:
Stop with any code other than E1DC, E1F2, E1F3, E1F7 or E14D?
Alternate between E1FD and any other code?
NO Repeat this step until all the memory modules are installed and tested.
After all the memory modules are installed and tested, go to “Step
1540-8” on page 2-22.
YES Go to “Step 1540-6”
Step 1540-6
The failure may be caused by the last memory module installed. To isolate the
failing FRU, do the following:
1. Turn off the power.
2. Exchange the last memory module installed.
3. Turn on the power.
Does the operator panel do one of the following:
Stop with any code other than E1DC, E1F2, E1F3, E1F7 or E14D?
Alternate between E1FD and any other code?
NO Go to " MAP 0410: Repair Checkout " in the Diagnostics Information for
Multiple Bus Systems.
YES Go to “Step 1540-7” on page 2-22.
Chapter 2. Maintenance Analysis Procedures (MAPs) 2-21