The Simplex 742-406 is the replacement CPU board for the Simplex 4009-9401 TrueAlert Addressable Controller NAC panel. Part 742-406 (also referenced as 565-990) restores normal controller operation when the primary CPU board fails. The board dimensions are 7.5 × 7.5 × 7.5 in and weighs 2 lbs. Installation requires replacing the existing CPU board in the 4009-9401 enclosure; consult the 4009T installation manual and your local authority having jurisdiction before servicing.
Key Features
- Direct replacement CPU board for Simplex 4009-9401 TrueAlert Addressable Controller
- Alternate part number: 565-990
- Board dimensions: 7.5 × 7.5 × 7.5 in, 2 lbs
- Restores full controller operation without panel replacement
Compatible Panels
4009-9401 TrueAlert Addressable Controller
Life Safety Consultants has supplied Simplex replacement parts since 2002. For questions about the 742-406 or any Simplex 4009T component, call 1-888-557-0558 or email sales@lifesafetycom.com.
Additional information
| Weight | 2 lbs |
|---|---|
| Dimensions | 7.5 × 7.5 × 7.5 in |
| Condition | New |
| Manufacturers | Simplex |





