UNI-T MSO3000E Series Service Manual Download

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Service Manual MSO/UPO3000E Serials products

Instruments.uni-trend.com

•

electricity failure

•

One or more defective load regulator points

The display is blank or there are streaks in the display

• LCD screen or video circuit failure.

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.

Start

Does the power bu tton

turn red?

Press the power

button

Confirm

：

Is the power cor d connected to the

oscil loscope?

Is the power cor d connected to the AC

outl et?

Does the AC outlet have AC power?

Replace the power cord

yes

Connect the power

cord

Does the power bu tton

turn green?

Does the fan spin?

yes

After 2 mi nutes, is

the display normal?

yes

Does the oscilloscope pass

the power-on se lf-test?

yes

Stop

yes

Power supply ch ec k

of the power modu le

Check the ground

resistance of each
secondary power supply
in the board

Back to UNI

T Servi ce

Center

Does the power bu tton

turn green?

Figure 2: Main troubleshooting tree

Summary of Contents for MSO3000E Series

Page 1: ...Service Manual MSO UPO3000E Serials products Instruments uni trend com 1 27 Service Manual MSO UPO3000E Serials products ...

Page 2: ...ormation 5 Theory of operation 5 power supply 6 interface board 6 motherboard 6 Keyboard deck and display 7 Maintainance 8 Prevention of Electrostatic Discharge 8 Check and clean 8 external cleaning 8 display cleaning 9 Return the instrument for repair 9 Removal and Replacement Procedure 9 required equipment 10 remove replacement program 10 Fault exclude 24 service level 24 Check FAQ 24 required e...

Page 3: ...r warnings and cautions related to the operating system When integrating this device into a system the safety of that system is the responsibility of the system assembler Avoid Fire or Personal Injury Use the correct power cord Use only the power cord specified for this product and certified for the country of use Use the correct power cord Use only the power source specified for this product and ...

Page 4: ...ing the common terminal more than the maximum rating for that terminal potential Do not float the common terminal above the voltage rating for that terminal The measurement terminals on this product are not rated for connection to mains or category II III or IV circuits Do not operate without cover Do not operate this product with covers or panels removed or the case opened May be exposed to dange...

Page 5: ...high voltage Know the voltage ratings of the probes you are using and do not exceed these ratings It is important to know and understand two ratings Maximum measured voltage from the probe tip to probe reference lead Maximum float voltage from probe reference lead ground These two voltage ratings depend on the probe and your application Check the Specifications section of the manual for details Co...

Page 6: ...n for repairs Hazardous voltages or currents may be present in this product Before removing protective plates soldering or replacing components Disconnect power remove the battery if applicable and open the test switch Verify safety after repair Always recheck ground continuity and power supply dielectric strength after performing repairs Terms in the manual These terms may appear in this manual W...

Page 7: ... names in headers titles table or graph titles or text at the top of the page Material without any specific product designation applies to all products in the brochure Where to find operational information For information on instrument installation operation and networking refer to the Help or Owner s Manual that came with your oscilloscope Theory of operation This chapter describes the electrical...

Page 8: ...e data from the analog front end the data of the keyboard board and send the data collected by the analog front end to the display screen according to the instructions input by the keyboard board power converter Power is converted to all voltages used for analog and digital circuits throughout the system Standby power is used to keep parts of the system powered at all times when AC power is connec...

Page 9: ...xterior of the case with a dry lint free cloth or a soft bristled brush If any dirt remains use a cloth or cotton swab dampened with a 75 isopropyl alcohol solution Use a cotton swab to clean up the space around the controls and connectors Do not use abrasives on any part of the case that could damage the case Clean the On Standby switch with a clean towel dampened with deionized water Do not spra...

Page 10: ...r strapping If the instrument is shipped to Uni Tech service center please attach the following information Owner s address The contact s name and phone number The type and serial number of the instrument The reason for the return A full description of the services required Mark the address of the Unilever service center and the return address on the shipping box in two prominent places Removal an...

Page 11: ...Prerequisites Whenever you are working on the instrument causing electrostatic damage to components wear a properly grounded anti static wrist and foot strap and work with an anti static mat in a tested anti static environment Steps 1 To remove the knob assembly pull the knob straight off the front panel Finger strength is sufficient to pull the knob Do not use pliers 2 To reinstall the knob align...

Page 12: ...ve steps Use a PH1 Phillips tip screwdriver to secure the screws Disassembled components The following procedure describes the removal and replacement of the rear assembly Prerequisites To prevent electrostatic damage to components while working on the instrument wear a properly grounded anti static wrist and foot strap and use an anti static mat in a tested anti static environment Remove the rear...

Page 13: ...s uni trend com 13 27 Steps 1 Use a PH1 Phillips tip screwdriver to remove the upper four screws 2 Use a PH1 Phillips tip screwdriver to remove the lower three screws 3 Use a PH1 Phillips tip screwdriver to remove the two screws on the left and right sides ...

Page 14: ...ear assembly open manually remove the coax and power cables connected to the motherboard 5 Flatten the front and rear components and manually remove the connections of the coaxial cable on the signal source sub board and the FPC cable on the main board 6 To reinstall reverse the above steps ...

Page 15: ...o components while working on the instrument wear a properly grounded anti static wrist and foot strap and use an anti static mat in a tested anti static environment Remove the rear cover Remove the rear assembly step 1 Use a PH1 Phillips tipped screwdriver to remove the two screws from the rear chassis frame 2 Use a PH1 Phillips tip screwdriver to remove two more screws from the rear assembly and...

Page 16: ...To reinstall reverse the above steps Remove the fan The following procedures describe fan removal and replacement Prerequisites To prevent static electricity from damaging components during construction wear a properly grounded anti static wrist and foot strap and use an anti static mat in a tested anti static environment Remove the rear cover Remove the rear assembly Remove the power cover Steps ...

Page 17: ... remove the fan 3 To reinstall reverse the steps Remove the interface board The following procedure describes the removal and replacement of the interface board Prerequisites To prevent electrostatic damage to components while working on the instrument wear properly grounded anti static wrists and feet and use an anti static mat in a tested anti static environment Remove the rear cover ...

Page 18: ...rews and then take out the interface board 3 To reinstall reverse the steps Remove the signal source daughter board The following procedure describes the removal and replacement of the signal source daughter board Prerequisites To prevent electrostatic damage to components while working on the instrument wear properly grounded anti static wrists and feet and use an anti static mat in a tested anti...

Page 19: ...er The following procedure describes the removal and replacement of the front cover Prerequisites To prevent electrostatic damage to components while working on the instrument wear properly grounded anti static wrist and feet and use an anti static mat in a tested anti static environment Remove the front panel knob Remove the rear cover Remove the rear assembly Steps 1 Use a PH1 Phillips tip screw...

Page 20: ...ostatic damage to components while working on the instrument wear properly grounded anti static wrists and feet and use an anti static mat in a tested anti static environment Remove the rear cover Remove the rear assembly Remove the front cover Steps 1 Use a PH1 Phillips tip screwdriver to remove the five screws 2 Turn over the display screen and fixing bracket and manually remove the FPC cable fr...

Page 21: ... cover Steps 1 Use a PH1 Phillips tip screwdriver to remove the six screws remove the keyboard deck and remove the attached cables 2 To reinstall reverse the steps Remove the motherboard The following procedures describe system board removal and replacement Prerequisites To prevent electrostatic damage to components while working on the instrument wear a properly grounded anti static wrist and foo...

Page 22: ...open end wrench to remove the four B s of the front panel assemblyNuts and washers for NC 3 Use a PH1 Phillips tip screwdriver to remove the ten screws that attach the motherboard to the front case assembly and use needle nose pliers to remove one copper post Then take out the motherboard ...

Page 23: ...failure is an instrument problem If the power fails the instrument needs to be sent back to the Uni Tech service center for repair because other internal electronic components or modules cannot be replaced by the user Check FAQ Use the following table to help isolate possible failures The following table lists problems and possible causes This list is not exhaustive but it can help eliminate quick...

Page 24: ...tion Start Does the power button turn red Press the power button Confirm Is the power cord connected to the oscilloscope Is the power cord connected to the AC outlet Does the AC outlet have AC power Replace the power cord no yes yes Connect the power cord Does the power button turn green Does the fan spin yes After 2 minutes is the display normal yes Does the oscilloscope pass the power on self te...

Page 25: ...for adjustment Product Composition Explosion Diagram The product is decomposed into three parts front cover product module assembly and rear cover Figure 3 Exploded View of Backshell Assembly with Handle and Feet Table 4 List of product components The index number Part Name describe 1 front cover Chassis front panel including knobs 2 Product module assembly Product module assembly including front ...

Page 26: ...y 2 Display mount Used to secure the display to the front assembly chassis 3 Display adapter board assembly Contains a display wage transfer board and FPC cable 4 Keyboard assembly Includes keyboard and FPC cable 5 Front Component Chassis Fix the main board display screen keyboard and other components 6 Motherboard Product core board 7 Silicone button Product buttons and keyboard boards cooperate ...

Page 27: ...w Table 6 List of rear components The index number Part Name describe 1 Power supply cover Protect people from electric shock 2 Power module Power supply for the whole machine AC power input 3 Rear frame Provides an interface fixing point for the rear panel of the product 4 Fan Machine heat dissipation 5 Interface board Rear panel interface output and transfer ...

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