Replacing The Pcb Bracket - Agilent Technologies 6890 Series Service Manual

4. Reassembly is the reverse of removal.

Replacing the PCB bracket

The PCB bracket must be replaced when changing from a Type 1 auxiliary
manifold to a Type 2 auxiliary manifold. See Installing a type 2 manifold, for
more information.
1. Compare the PCB bracket under the pneumatics PC board with the one
included in the accessory kit. Check for the differences in the three
mounting screw tabs. If they are the same, proceed to the next section.
If they are different, the existing bracket must be replaced with the new
one.
WARNING Before proceeding, turn off the main power switch and unplug the power cord.
2. Remove the GC lower back panel.
Caution Make sure you are properly grounded with an ESD strap before continuing.
3. If an MIO card is present, remove it and the jumper card.
4. Disconnect all cables from the pneumatics PC board.
5. Trace the ribbon cable on the end of the board to the main board and
disconnect it there. Feed the cable up through the PCB bracket to the top.
6. Remove the screws holding the PCB bracket and slide it and the board
out of the GC.
7. Remove the eight screws that fasten the board to the PCB bracket.
Transfer the board to the new bracket and secure it with the eight screws.
8. Slide the board and bracket assembly back into the GC. Use the 10 mm
screw provided in the kit for the left-most position, on the side of the GC.
Use the screws removed earlier for the other positions.
9. Pass the ribbon cable down through the slot in the PCB bracket and
connect it to the main board. Reconnect all cables to the pneumatics
board.
Jun 2001
Mainframe
Agilent 6890 Gas Chromatograph Service Manual
Power/Electronics Replacement
Replacing the pneumatics board
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