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4-2
Section 4 — Maintenance
Servicing Precautions
CAUTION
To prevent overheating do not operate the switcher frame with the door open for
an extended period of time.
Powering Down
WARNING
Unless specifically directed to do otherwise by a maintenance procedure,
turn power off before removing or repairing any circuit module or assembly
in this system. If the system has redundant power supplies, both supplies
must be turned off.
Before working on any power supply assembly, turn off the power and
disconnect the power cord from the AC power source.
CAUTION
When power to the switcher frame is turned off, the switcher setup at that time will
be lost. E-MEM and configuration data will be retained. To save the setup, save the
setup to E-MEM.
Removing any of the mezzanine modules from the Control Processor Modules will
result in complete data loss from the battery-backed SRAM on that mezzanine
module. This occurs because the batteries supplying power to the mezzanine
module are located on the Control Processor Modules and not on the mezzanines
themselves.
Removing Circuit Modules
All of the video processing and control processing in the system takes place
on circuit modules in the switcher frame and control panel. The locations
of these modules are illustrated in the appropriate portions of this section.
CAUTION
When removing circuit modules from the switcher frame place them on a flat non-
conductive surface. Failure to follow this precaution can result in loss of SRAM data
due to battery discharge or component damage due to electro-static discharge.