Service Manual UPO1000X Series
Instruments.uni-trend.com
To prevent possible injury to service personnel or damage to electrical components, please read information
on ESD prevention.
This section contains information and procedures designed to help you isolate faults to a module.
For assistance, contact your local UNI-T Service Center.
Service Class
The information and procedure contains in this section can help you determine whether the instrument has problem.
If is power failure, please send the instrument back to UNI-T Service Center for repair. Because the user cannot
replace the internal electronic components or modules.
Common Problem
Use the following table to isloate the possible faults. The table is not exhaustive, but it can help you to eliminate
quick-fix issues, such as the power cable is loose. For more details, please see Troubleshooting Flowchart.
Table 3 Fault Symptom and Possible Reason
The instrument cannot power on
• Power cable is not inserted.
• Power faults
• Microcontroller components has defective
The instrument is power on but the fan is failure
• Fan’s power cable faults
• Fan’s power cable is not connect to the circuit board
• Fan faults
• Power faults
• Load regulator have one or multiple defective points
Screen is blank or displays stripe
• LCD or video circuit faults
Required Device
• Check the digital voltage meter of power voltage
• Anti-static work environment
Troubleshooting Flowchart
Follow the troubleshooting flowchart to ensure the operation for the fault.
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