Replacing Assemblies 6
16900A, 16902A, and 16903A Service Guide 77
To remove and replace the power supplies
16900A and 16902A power supplies
1 Perform previous procedures:
• “To prepare the instrument for disassembly" on
page 48
• “To remove and replace the cover" on page 52
• “To remove and replace the front panel assembly" on
page 64
2 Disconnect the following cables on both power supplies:
• Power Cable
• Sense Cable
• 12- Position Cable
WARNING
Hazardous voltages exist on the power supply. To avoid electrical
shock, disconnect the power from the instrument before
performing the following procedures. After disconnecting the
power, wait at least six minutes for the capacitors on the power
supply board to discharge before servicing the instrument.
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