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Chapter 3 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 S1465H.
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
