346 Chapter7
Replacing Major Assemblies
Rear-Frame Assembly
Rear-Frame Assembly
This procedure applies to:
8590 E-Series and L-Series spectrum analyzers
8591C cable TV analyzers
8594Q QAM analyzers
CAUTION Use ESD precautions when performing this replacement procedure.
Removal
1. Remove the instrument cover assembly. Refer to the “Instrument
Cover.” removal procedure.
2. Place the analyzer with the top side facing up.
3. Remove the six screws (three on each side) that secure the rear
frame to the main chassis.
4. Remove the W6 jumper from the 10 MHz REF OUTPUT and the
EXT REF IN connectors.
5. Pull the rear frame straight back away from the main chassis.
NOTE Different models and option mixes will cause the configuration of the
cables and wires to the rear frame to vary widely. Therefore, you will
need to note these connections for reference during reassembly. See
Figure 7-19.
6. Disconnect the fan assembly from J19 on the A15 IF Motherboard
assembly.
7. Disconnect the wires and cables from the rear-frame assembly.
Replacement
1. Connect the wires and cables to the rear-frame assembly as noted
during the removal procedure. See Figure 7-18.
2. Connect the fan assembly to J19 on the A15 IF Motherboard
assembly.
CAUTION Wiring can be pinched between the rear frame and the edge of the A15
motherboard. Make sure that all wiring is routed to one side of the
SMB connector, A15J18, and through the notch located on the rear edge
of the motherboard.
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