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# Troubleshooting Guide (NAS-sourced)

Real troubleshooting-relevant content found in NAS manuals this pass, in addition to the 10 real FP-8A/FP-12A/FX-4 symptoms already documented in `` .

## FM-1 (real)

Protection circuit activates when: (1) unit is overheated, (2) speaker terminals are short-circuited. Fuse guidance identical to FX-4's: if it blows again after correct replacement, consult your dealer -- possible internal malfunction. Never use a higher-amperage fuse.

## FCC-90A (real, safety warning)

"This power capacitor may explode and cause serious injury or death if abused or didn't connect properly." Do not expose to voltage higher than specified, do not install in direct sunlight or extreme temperatures. Improper connections can cause electrical damage to the vehicle and/or equipment.

## Other SKUs

PENDING VERIFICATION -- troubleshooting sections for the remaining uncatalogued manuals not extracted this pass.