Agilent Technologies 8753ES Option 011 Service Manual page 288

Accessories Troubleshooting
Test Set Troubleshooting
• If the voltage is between 21.3 V and 22.7 V, the supply is good. Proceed with either of
the following:
— Refer to the test set manual to troubleshoot the test set and its interconnect cable
(especially if the test set LEDs don't light).
— Continue with
5. Be certain to press
A9 CC switch to the "normal" position.
Troubleshooting Control Problems in S-Parameter Test Sets
The analyzer controls the test set attenuator, the transfer switch (for forward and reverse
measurements), and, in the case of the 85047A, bypasses the frequency doubler. The
associated test set interconnect connector pins are shown in
needed.
NOTE Before continuing with these procedures, be sure the A9 CC switch is set to
the "alter" position and the value for the appropriate test set has been
"POKEd."
Attenuation Control Voltages
Voltage levels on the pins identified in Table control the test set attenuation. Press
ATTENUATOR PORT 1
Power
entry, check the pins (see
Table 9-2 Attenuation Voltage Matrix
Attenuation HP/Agilent 85046A/B
Pin 11
0 +5
10 +5
20 +5
30 +5
40 0
50 0
60 0
70 0
• Proper voltages: refer to the test set manual to continue troubleshooting. For
the 85047A systems, first see the note on
test set has been "POKEd."
• Wrong voltages: replace the A16 rear panel assembly of the analyzer.
9-10
"Troubleshooting Control Problems in S-Parameter Test Sets."
POKE
0 x1 Preset
and enter the attenuation values listed below. After each
Figure 9-4) for the indicated voltages.
Pin 22 Pin 23 Pin 8
+5 +5 +5
0 +5 +5
+5 0 +5
0 0 +5
+5 +5 +5
0 +5 +5
+5 0 +5
0 0 +5
after all troubleshooting and return the
Figure
HP/Agilent 85047A
Pin 11 Pin 22
+5 +5
+5 0
+5 +5
+5 0
0 +5
0 0
0 +5
0 0
page 9-10 to make sure that the appropriate
9-4: refer to it as
Pin 23
+5
+5
0
0
+5
+5
0
0
Chapter 9