Keysight N9010A EXA Service Guide 165
RF Section Troubleshooting (RF/Microwave Analyzers)
Troubleshooting
8. Front End Assembly Control Logic Verification
Since the RF Front End Troubleshooting board is connected, now is a good
time to test out the remaining control circuits from the A15 Front End Control
Assembly.
Table 4-9 Front End Control Logic
Test Point Description Instrument Settings Voltage
(VDC)
Tolerance
(VDC)
S2A Sets switch for Low Band/preamp path CF 50 MHz preamp on +9.67 ±0.5
S2B Sets switch for Low Band/preamp path CF 50 MHz preamp on +9.83 ±0.5
S3A Sets E-atten to 5 dB preamps off E-atten = 5 dB +9.67 ±0.5
S3B Sets E-atten to 5 dB preamps off E-atten = 5 dB +9.83 ±0.5
S4A Sets E-atten to 10 dB preamps off E-atten = 10 dB +9.67 ±0.5
S4B Sets E-atten to 10 dB preamps off E-atten = 10 dB +9.83 ±0.5
S5A Sets E-atten to 2 dB preamps off E-atten = 2 dB +9.67 ±0.5
S5B Sets E-atten to 2 dB preamps off E-atten = 2 dB +9.83 ±0.5
S6A Sets E-atten to 1 dB preamps off E-atten = 1 dB +9.67 ±0.5
S6B Sets E-atten to 1 dB preamps off E-atten = 1 dB +9.83 ±0.5
S7A Sets E-atten to 2 dB preamps off E-atten = 2 dB +9.67 ±0.5
S7B Sets E-atten to 2 dB preamps off E-atten = 2 dB +9.83 ±0.5
S8A Sets E-atten to 20 dB preamps off E-atten = 20 dB +9.67 ±0.5
S8B Sets E-atten to 20 dB preamps off E-atten = 20 dB +9.83 ±0.5
S9A Controls in & out to low band preamps off E-atten = off +9.83 ±0.5
S9B Controls in & out to low band preamps off E-atten = off +9.67 ±0.5
S11A Sets path for 1st or 2nd L.O. CF 1 GHz +9.67 ±0.5
S11B Sets path for 1st or 2nd L.O. CF 1 GHz +9.83 ±0.5
S12A Sets path for L.O. normal or
x2 for band 4
CF 1 GHz +9.83 ±0.5
S12B Sets path for L.O. normal or
x2 for band 4
CF 1 GHz +9.67 ±0.5
S13A Sets path for L.O. to either of the high band
mixers and L.O. output
CF 5 GHz
CF 20 GHz
−9.67
+9.67
±0.5
S13B Sets path for L.O. to either of the high band
mixers and L.O. output
CF 5 GHz
CF 20 GHz
+9.83
−9.83
±0.5
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