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Service Manual
The display is blank or there are streaks in the display
Required equipment
Digital voltmeter for checking mains voltage.
•
Anti-static working environment.
•
Troubleshooting flowchart
Follow the troubleshooting flowchart to determine the action for the fault condition.
Figure 2: Main troubleshooting tree
Instruments.uni-trend.com
Star t
Connect the power
cord
Confirm：
oscil loscope?
Does the power bu tton
no
turn red?
outl et?
yes
Press the power
button
Does the power bu tton
no
turn green?
of the power modu le
yes
resistanc e of each
secondary power supply
in the board
no
Does the fan spin?
yes
After 2 mi nutes, is
no
the display normal?
Back to UNI-T Servi ce
yes
Center
Does the oscilloscope pass
no
the power-on se lf-test?
yes
Stop
electricity failure
•
One or more defective load regulator points
•
• LCD screen or video circuit failure.
Is the power cor d connected to the
Is the power cor d connected to the AC
Does the AC outlet have AC power?
Replac e the power cord
yes
Power supply ch ec k
Check the ground
no
MSO/UPO3000E Serials products
Does the power bu tton
turn green?
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