471
Operator’s Service
Troubleshooting
To test the auxiliary power
The +5 V auxiliary power is protected by a current overload protection
device. If the current on pins 1 and 39 exceed 0.33 amps, the circuit
will open. When the short is removed, the circuit will reset in
approximately 1 minute. There should be +5 V after the 1 minute reset
time.

Equipment Required

Equipment Critical Specifications Recommended
Agilent Model/Part
Digital Multimeter 0.1 mV resolution, 3478A
better than 0.005%
accuracy
•Using the multimeter, verify the +5 V on pins 1 and 39 of the probe cables.