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Troubleshooting
Troubleshooting information is intended to first isolate the Power Sensor or the
Power Meter as the defective component. When the Power Sensor is isolated,
troubleshooting information is intended to identify the A1 Bulkhead Assembly or
the A2 Power Sensor Board Assembly as the defective component.
Before you open the Power Sensor to continue with the troubleshooting
procedures, try the substitution method of elimination. Use another power meter,
known to be in good operating condition, with the suspected power sensor and
cable. If the same problem occurs with the "known good" power meter, substitute
a "known good" power sensor cable.
Troubleshooting should be performed with the Power Sensor opened, and the
printed circuit board exposed. Refer to the "Disassembly / Reassembly
Procedures" on page 69.
When a failed assembly has been identified, refer to the repair section in either the
"A1 Bulkhead Assembly" on page 63 or the "A2 Power Sensor Board Assembly" on
page 64.
The FETs in A2U1 are light sensitive, and dc levels are shifted slightly when the
NOTE
FETs are exposed.
Excessive power damages the power sensor.
CAUTION
Electrostatic discharge renders the power sensor inoperative.
CAUTION
Troubleshooting and Repair procedures must be carried out at a static free
workstation.
Troubleshooting - eliminating the power meter and sensor cable
Where a "known good" power meter and/or sensor cable is unavailable, another
means must be used to isolate the fault to the power sensor.
Keysight 8480 Series Operating and Service Manual
Service
3
59
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Table of Contents
Troubleshooting
