This guide applies only to the microScan3 safety laser scanner. These instructions do not replace the product operating manual. If you have another model of safety laser scanner from SICK, see our previous post for more information about the diagnostic logs.
When lights are flashing on your microScan3 safety laser scanner or a code is output on the display, it is necessary to identify why this is occurring so appropriate actions can be taken. But how can you quickly diagnose and troubleshoot these issues?
Fortunately, the microScan3 Core safety laser scanner from SICK includes two useful features to help you diagnose and resolve any concerns: diagnostic LEDs and an intuitive display.
Diagnostic LEDs
The microScan3 Core safety laser scanner features four diagnostic LEDs for initial diagnostics that are located . See the chart below to see what each status LED means.
| Number | Function | Color | Meaning |
| 1 | OFF state | Red | Shines red when the OSSD pair is in the OFF state |
| 2 | ON state | Green | Shines green when the OSSD pair is in the ON state |
| 3 | Warning field | Yellow | Shines yellow if at least one warning field is interrupted |
| 4 | Restart interlock |
Yellow | Flashes if restart interlock is configured with reset and the restart interlock has been triggered. The operator must press the reset pushbutton. |
The OFF state and ON state LEDs can be found in multiple locations on the safety laser scanner. Three sets are arranged in pairs on the base of the optics cover. These LEDs can also be seen in many cases when it is not possible to see the display, e.g. due to the mounting situation or because it is hidden from the operator’s position.
Diagnostics Using the Display
The status display on the microScan3 Core supplies information about the status of the safety laser scanner, and for diagnostics and troubleshooting. The display switches off after approx. 60 seconds if all fields are clear and no other notification is displayed.
Some tips for working with the status display:
- If the display is switched off, press any pushbutton to activate the display.
- Use the pushbuttons to learn more details about the displayed status information. The right and left arrows will give more details. The check button will open a menu prompt. The x button will back out or close opened views.
- If there are a number of pages with detailed information, this is shown in the top right of the display
- Press the arrow buttons to switch to another page with detailed information.
The chart below shows the meaning of each display:
| Display | Meaning |
 All fields clear, OSSD pair in ON state. The number at bottom right indicates the active monitoring case. |
 OSSD pair in OFF state. |
 Protective field is clear, reset can take place. |
 Protective field is clear, configured time to restart expires. |
 Warning field interrupted (left column: number of interrupted warning fields, right column: number of warning fields in the current monitoring case). |
 Fault. All safety outputs in the OFF state. [Display flashes] |
 Contamination warning. Check the optics cover for damage. Clean the optics cover. [Display flashes] |
 Contamination fault. All safety outputs in the OFF state. Check the optics cover for damage. Clean the optics cover. [Display flashes] |
 Tamper protection. The safety laser scanner does not detect a contour in the set tolerance band. All safety outputs in the OFF state. |
 A valid input signal is not yet applied at the control inputs. All safety outputs in the OFF state.
After switching on, the safety laser scanner waits for a valid input signal. During this time, an invalid input signal does not result in a fault |
 The device is not configured. The device is in the as-delivered state or has been reset to factory settings. All safety outputs in the OFF state. |
 Passive state. All safety outputs in the OFF state. Press any pushbutton to obtain more information. |
If you need further help when diagnosing a scanner, contact SICK's Safety Help or visit the Safety Help Center page for additional service and support.
