B1 Fan - Agilent Technologies 8511B Operating And Service Manual

(5) Replacing the

B1 Fan

WARNING
Turn the test set OFF and disconnect the power cord from the mains.
Electrocution can result if power is not removed from the test set prior to this
procedure.
To replace the fan (B1), you must remove the transformer (T1) so that the
ends of the fan wires can be unsoldered from the line module FL1. See
Figure 8-5 on page 8-7 for a detailed view of the fan and transformer
hardware.
1. Turn the test set on its right side.
2. Unplug the transformer connector at J2 on the A15 regulator board.
3. Using a large pozidriv screwdriver, remove the four screws and washers
that hold the transformer onto the rear panel.
4. Using a large pozidriv screwdriver, remove the screw that holds the
transformer angle bracket to the main deck. The transformer wires
soldered to the line module are short, so do not pull the transformer out
too far.
5. Carefully remove the transformer from the test set and put it on the
bench close to the test set.
6. Strip the heat shrink tubing off of the two fan wires and unsolder the
wires from the line module. Cut any cable ties holding the fan wires to
nearby cables.
7. Using a small pozidriv screwdriver, remove the screw and lockwasher
that secure the green/yellow fan ground wire to the top of the rear panel
frame.
8. Using a small pozidriv screwdriver, remove the four screws that hold the
fan to the rear panel and remove the fan.
Agilent 8511B Test Set Operating and Service Manual 7-7
Replacement Procedures