HTS-420R Maintenance Manual
21
2. Automatic shutdown after turning on
(1) Check if battery has low power. If it does, replace the battery
(2) Replace the mainboard if the check if it is faulty
(3) Replace the EDM board to check if it is faulty
3. Program crash
(1) Check if the firmware version is correct. If it is not, upgrade with the correct version
(2) Restore the parameter and check again
(3) Replace the mainboard to confirm if it is a hardware fault
4. Tilt over even when the instrument is level
(1) Check the mechanical zero position.
(2) If the value is within the acceptable range of -30 to 30, Calibrate compensating linearity
(3) If the value is within -200 to -30 or 30 to 200, calibrate the mechanical zero position then calibrate the
compensating linearity.
(5)If the value is outside of -200 to 200, replace the compensator then calibrate the the mechanical zero
position and compensating linearity.
5. Blank screen, black screen or buttons don’t work
(1) Check if the screen cable is connected well
(2) Replace the LCD and check again
6. Fail to communicate with PC
(1) Replace the RS232-USB cable to check if it is faulty
(2) Check if the cable between the socket and mainboard is connected well
(3) Replace the mainboard to check if it is faulty
7. Don’t measure distance at all
(1) Check if the laser is emitting light. If it is not, replace the laser and check again
(2) Check if there is any light shutter blocking the laser. If yes, adjust the shutter or replace the motor and
check again
(3) Replace the EDM board to check if it is faulty
8. Only measure short distance
(1) Check if the filter motor is working smoothly. If it is not, replace the motor
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