Appendix D Service
174 Series N6700 User’s Guide
Removing/Installing the Interface (PPMC) board
Step 1. Remove the blower cover. Remove three screws from the top of the
cover and two screws on the sides. Tilt the cover up and slide it out.
Step 2. Remove the interface cover. Remove the three screws along the left
side of the unit. Then remove the screw at the front of the cover. Lift
off the cover.
Step 3. Use a hex wrench to remove the GPIB connector from the rear of the
mainframe Disconnect all cable assemblies from the interface board.
Step 4. On N6700A mainframes, use a T8 driver and remove the 2 screws
that attach the interface board. Lift the board out of the connectors
located under the front edge of the board.
On N6700B mainframes, disconnect the 3 cable assemblies located
along the front edge of the board. Use a T10 driver and remove the
screws that attach the board to the chassis. Lift the board out.
Step 5. To reinstall the interface board, perform the above steps in reverse
order. Replace all covers when finished.
Removing/Installing the Carrier/Bias board
Step 1. Remove the blower and interface covers as previously described.
Step 2. On N6700A mainframes only, also remove the interface board.
Step 3. Disconnect all cable assemblies from the carrier/bias board.
Step 4. Use a T10 driver and remove the screws that attach the carrier/bias
board to the chassis. Use a T20 driver and remove the 4 screws that
attach the board to the backplane assembly. Lift the board out.
Step 5. To reinstall the carrier/bias board, perform the above steps in
reverse order. Replace all covers when finished.
Removing/Installing the Front Panel Assembly
Step 1. Remove the two screws along the front of the bulk supply cover. Then
remove the two screws on each side of the front panel assembly.
Step 2. Slide the front panel assembly forward and away from the chassis to
access the test points for troubleshooting.
Step 3. To completely remove the front panel assembly, disconnect the
ribbon cable that connects the front panel to the interface board.
Step 4. Disconnect the wires going to the S1 switch assembly. For
reassembly, make a note of the color coding of the wires and the pins
to which they are connected.
Step 5. To remove the front panel board, remove the six screws that secure
the board to the front frame assembly.
Step 6. To remove the display module, first disconnect the cable at the P1
connector and the ribbon cable at the J2 connector. Then untwist the
tabs that hold the display module to the front panel board.
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