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Description of this Upgrade
Step 3. Remove Bottom Assemblies and Cables
B. Remove the A70 LFE Board (Options 405/420/425 Only)
Refer to your Service Guide's "Removing and Replacing the A70 or A75 Low
Frequency Extension (LFE) Board" section. Set aside all hardware for reuse.
Remove and Discard Some LFE Board Flexible Cables
The following cables are shown in
cables will be removed in
on page
— These cables can be discarded.
Figure 3
Remove One End of LFE Bottom-side Cables (N5245-60027, N5242-60079,
N5242-60080)
C. Remove the A20 IF Multiplexer Board
Refer to your Service Guide's "Removing and Replacing the A20 IF Multiplexer
Board" section. Set aside all hardware for reuse.
16
"Step 4. Remove Most Top Assemblies and Cables"
17.
— W191 (N5245-60027) A4 Source 1 Synth J102 to A70 LFE J20
— W192 (N5242-60079) A4 Source 2 Synth J102 to A70 LFE J21
— W193 (N5242-60080) A15 LO Synth J102 to A70 LFE J18
Figure 3 on page
16. The top-side end of the
Installation Note N5222-90133
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