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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
Digital Multimeter
• Using the multimeter, verify the +5 V on pins 1 and 39 of the probe cables.
490
Critical Specifications
0.1 mV resolution,
better than 0.005%
accuracy
Recommended
Model/Part
HP 3478A
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Table of Contents
Troubleshooting
