Chapter 7 335
Replacing Major Assemblies
A16 Processor/Video Board Firmware ROMs
A16 Processor/Video Board Firmware
ROMs
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. Remove the A25 Counter-Lock assembly. Refer to the “A25
Counter-Lock Assembly.” removal procedure.
3. Note the location of the four firmware ROMs: A16U6, A16U7,
A16U23, and A16U24. Refer to Figure 7-15.
4. Carefully pry the ROMs upward using a small-blade screwdriver.
Pull the ROMs from their sockets evenly so that the IC pins (1) at
the rear of each ROM are not bent.
Replacement
CAUTION To prevent damage to the ROMs, make sure that the ROMs are
oriented correctly with the sockets on the A16 assembly. Match the
notch (2) at the end of each ROM with the notch at the end of its socket.
Align each ROM IC pin with the opening of its pin receptacle on the
socket.
1. Position each ROM on the A16 assembly as illustrated in
Figure 7-15.
2. Install each ROM by carefully pushing down on both ends of the
ROM with equal pressure.
3. Replace the A25 Counter-Lock assembly. Refer to the “A25
Counter-Lock Assembly.” replacement procedure.
4. Replace the instrument cover assembly. Refer to the “Instrument
Cover.” replacement procedure.
5. Continue at the “Adjustments Required after ROM Replacement.”
procedure.
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