I. No Blood Oxygen, No luminescence

1.Possible cause:Luminescent pipe was broken                                                    Solution:   contact manufacturer

2.Possible cause:The luminous tube side cable short circuit                                Solution:   contact manufacturer

3.Possible cause:Machine-end connection is bad                                                 Solution:   Connect the ends of the machine

4.Possible cause:incorrect polarity                                                                       Solution:   contact manufacturer

5. Possible cause:The plug is too loose, could not receive the host signal        Solution:   contact manufacturer

II. No Blood Oxygen and waveform

1.Possible cause:Receiver tube anomalies                                                            Solution:   contact manufacturer to repair

2.Possible cause:unstable, luminescence, receiver tube circuit breaker              Solution:   contact manufacturer to repair

3.Possible cause:incompatible                                                                              Solution: Choose the right compatible model

4.Possible cause:Light-Leaking Seriously                                                           Solution:Re-use according to the instruction manual

5.Possible cause:Probe selection error                                                                 Solution: According to the machine instructions to select the correct probe

6.Possible cause: testing position there is no alignment LEDs and receiver       Solution:Re-use according to the instruction manual

7.Possible cause:Patient Attention is too low try several measurements            Solution:Please go to the hospital for accurate diagnosis

8. Possible cause:The fingers are trembling or the patient's body is moving       Solution:Don’t Move