5700A/5720A Series II Calibrator
Service Manual
5-30
3529 A16: Power Amp 220V Range Attenuator Fault
The Power Amplifier is configured to the dc 220V range with the input voltage being the
6.5V reference BRF6 and BSRF6. The resulting -130V at the output is connected to the
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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