Ceyear 4024D Podręcznik konserwacji - Strona 7

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Ceyear 4024D Podręcznik konserwacji
Fault cause: The microwave/millimeter-wave frequency conversion module has output fault.
Instrument to be repaired: Synthetic signal generator 1465H
Repair method:
1.
Eliminate the cable connection fault.
2.
Replace the microwave/millimeter-wave frequency conversion module.
3.7 SWR deviation at input port
Fault cause: The RF front end connection has fault or the connection cable has fault
Repair method:
1.
Check if the connection cables between the RF input connector, blocking module and
programmable step attenuator are reliable or loose.
2.
Please replace the blocking module and the connecting semi-rigid cable if the abnormality still
exists.
3.8 Phase noise deviation
Fault cause: The IF channel plate or frequency synthesis board has fault.
Instrument to be repaired: Synthetic signal generator 1465H
Repair method:
1.
Replace the IF plate, and verify whether 100 MHz reference ring has any problem or not.
2.
If the fault is irrelated to the IF plate, it shall be deemed that the frequency synthesis board has local
oscillator phase noise index deviation, and the frequency synthesis board shall be replaced.
3.9 Abnormal attenuation control
Fault cause: The attenuator has communication fault
Instrument to be repaired: Synthetic signal generator 1465H
Repair method:
1.
Check if the communication cable of the attenuator is properly fixed and the metal clip is normally
installed .
2.
Replace the rear cover assembly, and check whether the attenuation control is normal.
3.
Replace the microwave/millimeter-wave frequency conversion module if the fault still exists.
3.10
No display for battery under charging and current charging capacity
Fault cause: The CPU board has fault
Repair method:
1.
Maybe the battery is excessive discharged， please charge the battery for half an hour, and see if the
icon is correct.
2.
If the display is still incorrect after charged for half an hour, remove the battery and see if the power
supply icon is the icon of the external power supply. If not, please replace the CPU board.