Star Trac 4000, 4010, 4020 Error Codes
| DISPLAY READS | POSSIBLE CAUSES ARE: |
| NO
STO (no stop key on power up) |
•
Disconnected remote stop switch. • Shorted remote stop switch. • Stuck or sticking stop switch. • Faulty display board. |
| KEY
DN (key down on power up) |
•
Wrong key used when trying to access Test Mode. • Face plate keys damaged. • Faceplate keys shorted. |
| NO RPM | •
Disconnected or faulty RPM/Hall effect sensor. • Misaligned RPM sensor. • Flywheel abrading the RPM sensor cable. • Dirty RPM sensor and disc (Optical sensor). • RPM feedback loss (Optical sensor). • Faulty MCB. |
| SP
CNG (abrupt speed change) |
•
Disconnected or faulty RPM/Hall effect sensor. • Misaligned RPM sensor. • Flywheel abrading the RPM sensor cable. • Dirty RPM sensor and disc (Optical sensor). • RPM feedback loss (Optical sensor). • Faulty MCB. • IR Comp adjustment. |
| EL
STL, RNG, or LOST (elevation stall or out of range) |
•
Blown elevation fuses. • Faulty elevation motor. • Faulty MCB. • Faulty display cable. • Elevation count not within range. • Mechanical binding. |
| EL
NOZ (elevation can’t find 0%) |
•
Elevation count not within range. • Faulty elevation motor. • Faulty MCB. • Faulty display cable. • Blown elevation fuses. • Mechanical binding. |
