Specifications

Chapter 3 Replacing Assemblies
To Remove the Motherboard
186 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.