Chapter 7 Servicing
7-11
INPUT SIGNAL CONDITIONING BOARD REPLACEMENT
Equipment required:
Nut Driver
Input Signal Conditioning Board (Part No. 9989)
1. Wear an antistatic wrist strap, see “Safety Precautions,” earlier in this chapter for
more information.
2. Disconnect power and remove cover.
3. Disconnect all plug-in connections from the Input Signal Conditioning Board.
4. Remove all screws holding the board to the bracket, and remove the board.
5. Install the new board by following the above directions in reverse.
6. Re-install the instrument cover.
DC AND BIAS POWER SUPPLY BOARDS REPLACEMENT
Equipment required:
Nut Driver
Screwdriver
DC Power Supply Board (Part No. 8931)
Bias Supply Board (Part No. 8933)
1. Wear an antistatic wrist strap, see “Safety Precautions,” earlier in this chapter for
more information.
2. Disconnect power and remove cover.
3. Disconnect all plug-in connections from the Input Signal Conditioning Board.
4. Remove the four screws holding the Input Signal Conditioning Board bracket from
the Main Power Supply Board bracket, and remove the Input Signal Conditioning
Board assembly.
5. Disconnect all plug-in connections from the Main Power Supply Board being
replaced.
6. Remove the screws holding the board to the chassis and remove the board.
7. Install the new board by following the above directions in reverse. Care should be
exercised to ensure that voltage regulators fit into the plug on the bottom of the
board.
8. Re-install the instrument cover.
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