HTS-420R Maintenance Manual
13. Light Path Switch Motor Replacement ................................................................................... 17
Troubleshooting ........................................................................................................................................... 18
Fault Analysis........................................................................................................................................ 19
Fault Clearance ..................................................................................................................................... 20
1. Fail to turn on ........................................................................................................................... 20
2. Automatic shutdown after turning on ...................................................................................... 21
3. Program crash .......................................................................................................................... 21
4. Tilt over even when the instrument is level ............................................................................. 21
5. Blank screen, black screen or buttons don’t work .................................................................... 21
6. Fail to communicate with PC .................................................................................................... 21
7. Don’t measure distance at all ................................................................................................... 21
8. Only measure short distance .................................................................................................... 21
9. Inaccurate slope distance result ............................................................................................... 22
10. Accurate slope distance result but inaccurate horizontal distance result ............................... 22
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