3
Replacing Assemblies
198
Keysight 53210A/53220A/53230A Assembly Level Service Guide
To Remove the Motherboard
1
Remove the cover and rear bezel from the counter as described previously.
2
If installed, remove the Option 300 Internal DC Battery assembly as described
previously.
3
If installed, remove the Option 106 or 115 Channel assembly as described
previously.
4
Remove the Processor board as described previously.
5
Remove the Front Panel assembly as described previously.
6
The following procedure completes the removal of the motherboard:
a
Disconnect the two-wire (red/black) fan connector at the right-rear of the
motherboard (J1201).
b
Disconnect the four-wire (2 red/2 black) power supply connector at the
right-front of the motherboard (J1000).
c
Using a 14mm deep socket, remove the lock nut and lockwasher from the
Ext Ref In
and
Gate In/Out
BNC connectors on the rear panel.
d
Remove the T20 TORX screw at the rear-center of the motherboard.
e
Slide the motherboard forward until the three locking tabs (two on the right
side and one on the left side) are centered in their locking slots. Lift the
motherboard up away from the tabs and slide it the rest of the way clear of
the mainframe.
7
To replace the motherboard, reverse the above procedure.
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