420 Chapter10
Analyzer Options and Block Diagrams
First LO Distribution Amplifier (LODA) 8593E, 8594E, 8594Q, 8595E, 8596E Option 009
10.The voltage measured on the DVM should be greater than +14 Vdc.
11.Move the jumper from +10 VR to −10 VR (refer to the A10
schematic). The voltage measured should be more negative than
−13 Vdc.
12.If the voltages do not meet the limits described in step 10 and
step 11, troubleshoot the A10 Tracking Generator Control assembly.
13.Connect the positive DVM lead to A10J2 pin 1.
14.The measured voltage should be approximately +5 Vdc. If the
voltage is not +5 Vdc, troubleshoot the A10 Tracking Generator
Control assembly.
15.Connect the positive DVM lead to A10TP5, GB (gate bias). The
voltage should measure within 5% of the GATE voltage listed on the
RF section label.
16.If the voltage is not within this range, rotate A10R29 (GATE)
through its range while monitoring the DVM.
17.If the voltage varies between 0 Vdc and −2 Vdc, adjust A10R29
(GATE) for a DVM reading within 5% of the GATE voltage listed on
the RF section label. If the voltage does not vary outside the range of
0 Vdc and −2 Vdc, troubleshoot the A10 assembly.
18.Set the analyzer
LINE switch to off, reconnect W38 to A10J2, then set
the analyzer
LINE switch to on.
19.If the DVM reading changes more than 50 mV, the A3A14 LODA is
probably defective.
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