70 Agilent 5517B/BL/C/D/DL/FL User’s Guide
7 Service
To remove the A3 Controller/Reference Board
1 Remove the cover (MP10).
See “To remove the Front Panel and the Cover" on page 69
2 Remove the screws and flat washers that attach the A3
Controller/Reference Board to the shield (MP2) by removing the four
screws (H2) and flat washers (H6).
3 Using TORX #8 screwdriver, remove the voltage regulator’s screw (H5)
and washer (H7).
4 Unplug the A3 board from the A4 Sampler Board and the A1 Connector
Board.
To remove the A1 Connector Boa rd
1 Remove the cover (MP10).
See “To remove the Front Panel and the Cover" on page 69
2 Remove the A3 Controller Reference Board.
See “To remove the A3 Controller/Reference Board" on page 70.
3 Unplug the A5 Laser Tube Assembly wires from the two- pin connector
on the A1 Connector Board, and the A2 Power Supply wires from the
three- pin connector on the A1 board.
4 Using the TORX #15 screwdriver, remove two rear- panel crews (H9)
that attach the rear panel (MP3) to the laser base.
5 At the top of the rear panel (MP3), remove the two screws (H10) and
washers (H6) that attach to the A1 Connector Board.
6 Using TORX #8 screwdriver, remove the two screws (H11) that attach
A1 Connector Board to the rear panel (MP3).
The old controller board has two regulators.
When r einstalling the board, make sure the thermo insulator pad (MP9) is
installed under the regulator. (On the old controller board the smaller
screw and wash er is use d on th e rig h t-si d e reg u lator.) Make sure the
connector pins that interface with the A4 Sampler Board.
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