Service manual

5-1
Contents
Troubleshooting
Overview
The troubleshooting procedures in this chapter isolate equipment problems to a field-replaceable
unit (FRU).
The following are field-replaceable units:
• Infrared touchscreen (IRTS) and bezel (90385 only)
• CPU board
• I/O board
• Interconnect board
• Display assembly, which includes the following as part of the replacement display (90385 only):
Video driver
Internal power supply
Deflection board
CRT
PCBA adapter (I/O to touchscreen)
• Backplane PCBA (90387 only)
• CPU power supply PCBA (90387 only)
Suggested Tools and Parts
These items are necessary for troubleshooting:
• Flathead screwdriver
• Phillips screwdriver #1 and #2
• 13/16 nut driver
• DIP removal tool
• Multimeter
• Monitor cover removal tool (90385 only)
• PS2 mouse
• Printed circuit board assemblies (PCBAs)
• Static mat
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Suggested Tools and Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Symptoms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Monitor Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
System Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Boot Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Diagnostic Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12