Figure 4-1 Suspect Frus - HP SureStore Optical Jukebox 160ex Service Manual

Figure 4-1
Troubleshooting and Diagnostics
Troubleshooting Using the Control Panel
Suspect FRUs
How Suspect FRUs Are Evaluated
Similar to treating symptoms rather than the real problem, the suspect
FRUs given by the FRU isolation procedure may actually mask the root
cause of the problem.
The hard move error that caused the robotics to run the FRU isolation
test may only be a product of the actual problem. Blindly and repeatedly
replacing the suspect FRU(s) will not reliably solve a problem.
If you consider the suspect FRU as a pointer to the problem area rather
than the problem itself, an educated visual inspection should reveal the
real problem.
A good visual inspection requires an understanding of how the jukebox
normally operates. To understand what the robotics do in normal
operation, run the various movements available from the control panel
and watch it closely. Reading the descriptions in the "Micro-Move ID"
table in this chapter will also help you understand the small moves that
comprise jukebox operation.
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