HP Surestore 160ex - Optical Jukebox, Service Manual

Page: 217 / 230

Theory of Operation
Optical Drive Mechanism
Chapter 6 6-25
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After an overforce shutdown occurs, the jukebox analyzes the
situation, self-calibrates, and attempts a retry
• Sense of touch : Sense of touch is the process where actual force used
is compared to the recommended force for each move. The jukebox
uses this information to detect errors or qualify moves. The difference
between sense of touch and overforce shutdown is that the servo is
not automatically shut down if sense of touch detects an error.
• Motor position : The positions of the motors are continuously
monitored by the controller PCA. The position, along with the sense of
touch feedback, is a valuable source of error detection.