Fluke 5720A service manual 3530 A16 8255 Was Reset, 3600 +17S Supply Fault, 3601 -17S Supply Fault

5700A/5720A Series II Calibrator

Service Manual

input of the 220V RANGE AC ATTENUATOR circuit which has a nominal gain of -.01. The resulting +1.3V at its output is measured to be within 10% by connecting it to the RCL line and routing it to the +input of the adc circuit on the DAC assembly. The DAC output is connected to the -input and adjusted until a null is achieved. A failure indicates the Power Amplifier assembly (A16) is probably at fault.

3530 A16: 8255 Was Reset

The control word of the 8255 on the Power Amplifier is read. A failure indicates the Power Amplifier assembly (A16) is probably at fault.

3600 +17S Supply Fault

The instrument is dormant and the +17 S supply is out of tolerance. Measure the +17 S voltage on the Regulator/Guard Crossing assembly (A17). COM = TP9, HI = TP8. The voltage should be +17.0V to +18.0V. If the voltage is out of tolerance, the Regulator/Guard Crossing assembly (A17) is faulty. If the voltage is within tolerance, the diagnostic circuit on the Switch Matrix assembly (A8) is faulty.

3601 -17S Supply Fault

The instrument is dormant and the -17 S supply is out of tolerance. Measure the -17 S voltage on the Regulator/Guard Crossing assembly (A17). COM = TP9, HI = TP12. The voltage should be -17.0V to -18.7V. If the voltage is out of tolerance, the Regulator/Guard Crossing assembly (A17) is faulty. If the voltage is within tolerance, the diagnostic circuit on the Switch Matrix assembly (A8) is faulty.

3602 +15S Supply Fault

The instrument is dormant and the +15 S supply is out of tolerance. Measure the +15 S voltage on the Regulator/Guard Crossing assembly (A17). COM = TP9, HI = TP18. The voltage should be +14.2V to +15.8V. If the voltage is out of tolerance, the Regulator/Guard Crossing assembly (A17) is faulty. If the voltage is within tolerance, the diagnostic circuit on the Oscillator Output assembly (A13) is faulty.

3603 -15S Supply Fault

The instrument is dormant and the -15 S supply is out of tolerance. Measure the -15 S voltage on the Regulator/Guard Crossing assembly (A17). COM = TP9, HI = TP19. The voltage should be -14.2V to -15.8V. If the voltage is out of tolerance, the Regulator/Guard Crossing is faulty. If the voltage is within tolerance, the diagnostic circuit on the Oscillator Output assembly (A13) is faulty.

3604 +42S Supply Fault

The instrument is dormant and the +44 S supply is out of tolerance. Measure the unregulated +44 S voltage on the Filter/PA Supply assembly (A18). COM = TP22, HI = TP7. The voltage should be +45V to +75V. If the voltage is out of tolerance, the Filter/PA Supply assembly (A18) is faulty. If the voltage is within tolerance, measure the regulated +44 S on the Regulator assembly. (A17) COM = TP9, HI = TP13. The voltage should be +42.0V to +45.6V. If the voltage is out of tolerance, the Regulator/Guard

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