Field-Replaceable Units (Frus); Introduction - Qualstar RLS-8350 Technical & Service Manual

7. Field–Replaceable Units (FRUs)

7.1 Introduction

Many of the major components in the RLS are available from Qualstar as separate
Field-Replaceable Units (FRUs). Each FRU can be removed and replaced on-site by
qualified personnel. Some of the FRUs are mechanical assemblies while others are
Printed Circuit Board Assemblies (PCBAs).
Table 7-1 lists all of the RLS FRUs, their Qualstar part numbers, the time estimated
for an experienced technician to remove and replace a FRU for the first time and
whether the libraries power needs to be removed.
When certain FRU's (Field Replaceable Units) are installed the library will need to be
calibrated to adjust for mechanical manufacturing tolerances. The RLS has been de-
signed to detect when it needs to be calibrated and will place a message on the control
panel at that time. Normal library operation will not continue until the calibration
process has been completed
Static electricity can permanently damage the integrated circuits on all RLS
PCBAs. Standard ANTI-STATIC practices should be employed when working
on the RLS. At a minimum, touch an unpainted portion of the RLS chassis be-
fore handling any PCBAs.
Left and right sides of the RLS are referred to throughout this chapter. Left and right are
defined when viewing the RLS from the front. Please remember this important concept.
511010 Rev. 07-01-19
CAUTION
NOTE
Field–Replaceable Units (FRUs) 7-1