Chassis Mounted Components; Test Equipment Required; Fuse Replacement - Agilent Technologies 6622A Service Manual

c. Remove the rack ears or vinyl trim from the sides of the
front panel.
d. Remove the two screws on each side of front panel.
e. Slide the panel forward.

4-11 Chassis Mounted Components

The power transformer is fastened to a mounting bracket by
mounting screws, flat washers, and shoulder washers.
Before removing the attaching hardware, disconnect the
power cable leads at the transformer.
To avoid breaking the transformer tabs (lugs), do not
bend the transformer tabs. When disconnecting a lead,
pull the lead connector straight back from the tab.
When reconnecting a lead, push the connector straight
forward onto the transformer tab. Do not flex the leads
or tabs when making connections or disconnections.
When replacing the transformer, refer to the label on the
transformer to ensure you reconnect the leads correctly. You
can also refer to Figure 6-1 which shows all AC connections
schematically for each of the models.
The fan and fan guard are secured to the chassis by
mounting screws, flat washers, and nuts. Remove this
hardware, disconnect the ac connector on the fan assembly,
and lift the fan from the unit.
Be sure to remove the AC line cord from the unit before
attempting to work on the AC line module.
To remove the AC line module, first disconnect all of the
wires from it (including the RFI capacitor). Then use a
screwdriver inside the unit to press the mounting clip on
one side of the line module and push (from inside the unit)
that side of the module slightly away from the chassis.
Finally, use the screwdriver again to press on the mounting
clip on the other side of the module and push that side out.
The module can be replaced simply by sliding it straight
back into the mounting hole until the mounting clips spring
into position securing the module. The wires can be
replaced according to the AC connections shown in Figure
6-1.

4-12 TEST EQUIPMENT REQUIRED

Table 4-1 lists the test equipment required to troubleshoot
the power supply. Recommended models are listed.

4-13 FUSE REPLACEMENT

Table 4-2 gives the rating of the fuses in the supplies. The
clip mounted ac line fuse is located in the line module on
the rear of the supply. The line module also contains a
voltage selection card which must be set to the associated ac
input (100, 120,220, or 240 VAC). Section II in the Operating
Manual (Agilent 5957-6332) explains how to change the line
voltage setting.
The GPIB board has one fuse F201 as shown in Figure 4-2.
The 40WLV Output board and 40WHV Output board fuse
locations are shown in Figures 4-3 and 4-4, respectively. The
80WLV Output board and 80WHV Output board fuse
locations are shown in Figure 4-5. The fuses are shown
schematically in Figures 6-1 through 6-3 in the rear of this
manual.
4-5