Ssembly Replacement Sequence; Receiver Failure Error Messages - HP 8753D Option 011 Service Manual

ssembly Replacement Sequence

The following steps show the sequence to replace an assembly in an HP 8753D Network
nalyzer.
1. Identify the faulty group. Refer to Chapter 4, \Start Troubleshooting Here." Follow up
with the appropriate troubleshooting chapter that identi es the faulty assembly.
2. Order a replacement assembly. Refer to Chapter 13, \Replaceable Parts."
3. Replace the faulty assembly and determine what adjustments are necessary. Refer to
Chapter 14, \ ssembly Replacement and Post-Repair Procedures."
4. Perform the necessary adjustments. Refer to Chapter 3, \ djustments and Correction
Constants."
5. Perform the necessary performance tests. Refer to Chapter 2, \System Veri cation and
Performance Tests."

Receiver Failure Error Messages

The error messages which indicate receiver group problems may be caused by the instrument
itself or by external devices or connections. Remember that RF OUT must be connected to
input R to maintain phase lock (unless internal cables are moved). The following three error
messages share the same description.
AUTION: OVERLOAD ON INPUT A, POWER REDU ED
AUTION: OVERLOAD ON INPUT B, POWER REDU ED
AUTION: OVERLOAD ON INPUT R, POWER REDU ED
If any of the above error messages appear, you have exceeded approximately +3 dBm at
one of the input ports. The RF output power is automatically turned o . The annotation
P appears in the left margin of the display to indicate that the power trip function has
been activated. To reset the analyzer's power and regain control of the power level, do the
following:
1. Remove any devices under test which may have contributed excess power to the input.
2. Connect the equipment as shown in Figure 8-1.
3. Press
ENU
POWER
5
If the power trip indicator (P) does not reappear, recon gure the test setup to keep input
power levels at 0 dBm or below.
If P reappears, continue with \Check the R, , and B inputs."
8-2 Receiver Troubleshooting
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0 1
POWER TRIP OFF
5 5
to return the power level to the preset state.
RAFT
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