TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01 B-19
Monday, November 26, 2001 1:09 pm
Replacement Procedures
This section discusses the replacement procedures for the TDR9000.
These procedures include:
• Internal circuit boards
• Physical Front Panel Modules
• Power Supply Circuit Board Fuses
• Power Supply Module
WARNING Turn power OFF and disconnect from line power before reaching into
the Instrument.
Internal Circuit Boards
The on-site repair philosophy is to replace only complete printed circuit
boards or other subassemblies. None of the solid-state printed circuit
boards need user calibration or adjustment.
Remove or insert printed circuit assemblies carefully to avoid damage to
their mating connectors and make sure that replacement circuit boards
are placed in the same locations from which damaged circuit boards
were removed. Circuit boards are shipped with a label identifying the
type of board. Individual slots are marked with labels, as well.
N
OTE
Wear ESD wrist straps when working with circuit boards.
To replace a circuit board:
1. Turn the power OFF.
2. Disconnect all external cables from the Instrument, except the
Instrument ground cable.
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