26 IBM WorkPad z50, Mobi le Companion 26
Intermittent Problems
Intermittent system han g problems can be caus ed by a
variety of reasons that have nothing to do with a hardware
defect, such as: cosmic radiation, electrostatic discharge, or
software errors. FRU r eplacement should be c onsidered
only when a recurring p roblem exists.
When analyzing the intermitt ent pr obl em, do the following:

1. Run the diagnostic test for the mainboard in l oop

mode.

2. If no error is detected, do not replace any FRUs.

3. If any error is detected, replace th e FRU shown by

the FRU code. Rerun the test to ver ify that no more
errors exist.
Undetermined Problems
You are here because th e diagnostic tests did not identify
which adapter or device failed, ins t al l ed devices are
incorrect, a short circuit is suspected, or the s ystem is
inoperative. Follow these proc ed ur es to isolate the failing
FRU (do not isolate nondefective FRUs).
Verify that all attached devices ar e supported by the
WorkPad z50.
Verify that the power su pply being used at th e time of the
failure is operating c orrectly. (See “Power S ystems
Checkout” on page 9.)

1. Enter suspend mode.

2. Visually check them f or damage. If any pr oblems are

found, replace the FRU.

3. Remove or disconnect all of the f oll ow in g d evic es:

a. Non-IBM devices
b. Devices attached to the cradl e
c. External devices
d. Battery pack
e. DRAM
f. PC Cards
g. Compact Flash Cards

4. Turn on the WorkPad z50.

5. Determine if the problem has chan g ed.

6. If the problem does not reoccur, r econnect the

removed devices one at a time until you find th e
failing FRU.

7. If the problem remains, replace th e following FRUs

one at a time. Do not r eplace a nondefective FR U.
a. Mainboard
b. LCD assembly