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5-46 Chapter 5
Errors and Troubleshooting
Troubleshooting Without the Front Panel or RMC Web-Based Library
Administrator
NOTE If you replace a component during the diagnostic process and it is
determined not to be at fault, ensure that you replace the original
component back into the library.
Fuse Diagnostics
There are many fuses in the library, none of which are field-replaceable.
Most of the fuses on the card cage boards will only open if there is a
problem on that board. Therefore, if the fuse is blown, replacing the
entire card will resolve the problem. There are a few notable exceptions
to this, as listed below. Because every level of a multi-level library is
independent from a power standpoint, diagnosis and repair can be
accomplished in a systematic fashion.
Fuse exceptions:
• The library controller and slave controller card(s) contain 12V drivers
for the tape door and mailslot solenoids at their respective level. The
board powers up with a green LED even if the 12V fuse is open
because all logic operates on 5V. If a solenoid fails in a shorted mode,
or if the solenoid cable has been damaged and has come into contact
with the chassis, the 12V fuse will open on the board (library
controller on the lowest level and slave controller on other levels).
Replacing the library or slave controller will open the 12V fuse on the
new board as well.
— Do not continue to replace boards without trying to locate the
problem. Check to see if all solenoids are working on a level. Do
this by listening for the solenoids to close and try opening the
drawers after power up. Remember to make sure that the drawers
are not key locked and can be opened when the library is powered
off. If both solenoids do not activate, suspect the fuse of being
opened and replace both solenoid and sensor cable assemblies at
that level, and then replace the board on that level (library
interface or slave controller).
— If only one solenoid on a level is operating, the fuse is intact. Only
replace the failing solenoid cable assembly.