4.0 Undetermined Problem
1. Power-off the system.
2. Remove or disconnect one of the following adapters or devices.
Non-IBM devices
Any external device (modem, printer, or mouse)
Math Coprocessor option (Model 70 386 only)
Any adapter
Fixed disk or diskette drive
Memory module kits.
3. Power-on the system.
4. If the symptom remains, repeat steps 1, 2, and 3 until you find the
failing adapter or device.
5. If all adapters and devices have been removed and the problem remains,
check the power supply voltages. If the voltages are correct, replace
the system board. If the voltages are not correct, replace the power
supply.
IBM PS/2 Model 70 HMS
Undetermined Problem
¦ Copyright IBM Corp. 1991
4.0 - 1
