IBM B50 manual Diagnostics, Information for Multiple Bus Systems, Other Symptoms or Problems

Symptom	Action
Flashing 888 is displayed in the control panel	Go to the Fast Path MAP in the	Diagnostics
followed by additional error codes. Record in	Information for Multiple Bus Systems.
sequence each code that is displayed after the
flashing 888 goes away. Stop recording when
the flashing 888 reappears.
There Appears to be a Display Problem (Blank, Distortion, Blurring, Etc.)
All display problems.	1. If using a graphics display:
	a. Go to the Problem Determination
	Procedures for the display.
	b. If you do not locate the problem, replace
	the display adapter.
	2. If using an ASCII terminal:
	a. Make sure that the ASCII terminal is
	connected to Serial Port 1.
	b. If the problems persist, go to the
	Problem Determination Procedures for
	the terminal.
	3. If you do not locate the problem, suspect
	the system board. Go to “MAP 1540:
	Minimum Configuration” on page 2-17.
Power and Cooling Problems
The power LEDs on the operator panel and	Go to “MAP 1520: Power” on page 2-12.
power supply do not come on or stay on.
The power LED on the operator panel comes on	Automatic power-up is a feature on the Model
and the system powers on automatically when	B50. Refer to “System Board Jumper Settings”
A/C power is applied.	on page 1-8for the correct settings. If the
	jumper is set in the disabled position, replace
	the system board.
The power LED on the operator panel comes on	Go to “MAP 1520: Power” on page 2-12.
and stays on but the system does not power on.
The cooling fan(s) do not come on or come on	Go to “MAP 1520: Power” on page 2-12.
but do not stay on.
Other Symptoms or Problems
You do not have a determined symptom.	Go to “MAP 1020: Problem Determination” on
	page 2-6.
The system POST indicators are displayed on	Go to “Boot Problems or Concerns” on
the system console, the system pauses and	page 3-27.
then then restarts. The term "POST indicators"
refers to the icons (graphic display) or device
mnemonics (ASCII terminal) that appear during
the power-on self-test (POST).

Chapter 2. Maintenance Analysis Procedures (MAPs) 2-3