Ceyear 4024D Руководство по техническому обслуживанию - Страница 6
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Analysis on common faults
3.1 Lighting failure of power indicator lamp
Fault cause: The keyboard has fault or the CPU board has communication fault
Instrument to be repaired: Digital display megawatt multimeter FLUKE 1508
Repair method:
1.
Check whether the DC voltage output by the adapter is 14 V ~ 16 V;
2.
If the adapter is normal, firstly replace the front cover assembly;
3.
If the fault still exists after the front cover assembly is replaced, replace the CPU board.
3.2 No response of key
Fault cause: The keyboard has fault and the CPU board has communication fault.
Repair method:
1.
Firstly check to see if each key of the main unit is stuck;
2.
Check if the cable connection between the front cover assembly and the CPU board is normal;
3.
If the cable is normally connected, replace the front cover assembly.
3.3 No zero frequency signal
Fault cause: The communication cable has connection fault or the microwave/millimeter-wave frequency
conversion module and frequency synthesis board have fault
Repair method:
1.
Check if the semi-rigid cable and flexible cable in the main unit are reliably and correctly connected.
2.
If the cable is normally connected, please replace the frequency synthesis board, and power it on
and check it for zero frequency.
3.
Please replace the microwave/millimeter-wave frequency conversion module if the abnormality still
exists.
3.4 Frequency accuracy out of standard
Fault cause: The IF channel plate or frequency synthesis board has output fault
Instrument to be repaired: Synthetic signal generator 1465H
Repair method:
1.
Eliminate the cable connection reliability problem of the main unit.
2.
Check if the frequency accuracy significantly changes in case of the internal reference input and the
external reference input respectively. If the frequency accuracy significantly changes, it shall be
determined that 100 MHz reference ring has fault, and the IF channel plate shall be replaced.
3.
Please replace the frequency synthesis board if the fault still exists.
3.5 No signal detected when the pan smaller than 5 MHz, but normal when the span
is larger than 10 MHz
Fault cause: The frequency synthesis board has output fault
Instrument to be repaired: Synthetic signal generator 1465H
Repair method:
1.
Eliminate the cable connection problem.
2.
Replace the frequency synthesis board.
3.6 Large deviation between the signal amplitude of a certain wave band and the
actual condition