342 Chapter7
Replacing Major Assemblies
A25 Counter-Lock Assembly
A25 Counter-Lock Assembly
This procedure applies to:
8590 E-Series and L-Series spectrum analyzers
8591C cable TV analyzers
8594Q QAM analyzers
Removal
1. Remove the instrument cover assembly. Refer to the “Instrument
Cover.” removal procedure.
2. Place the analyzer on the worksurface with the bottom side facing
up.
3. Disconnect W20 (1) from the counter-lock assembly. See Figure 7-17.
4. Disconnect the cables from A25J3 and A25J5 (2).
5. Disconnect W4 (4) from the counter-lock assembly.
6. Remove the four mounting screws (5).
7. As you remove the counter-lock assembly, disconnect the cables from
A25J1 and A25J2 (3).
8. Place the counter-lock in a static-safe container.
Replacement
1. As you replace the counter-lock assembly, reconnect the cables to
A25J1 and A25J2 (3). See Figure 7-17.
2. Replace the four mounting screws (5).
3. Connect W20 (1) to the counter-lock assembly.
4. Connect the cables to A25J3 and A25J5 (2).
5. Connect W4 (4) to the counter-lock assembly.
6. Replace the instrument cover assembly. Refer to the “Instrument
Cover.” replacement procedure.
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