Keysight N9020A - Page 220

220
Front End Control Troubleshooting
A15 Front End Control Assembly Troubleshooting
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
S14A Sets path to either band 1 & 2 mixer or band
3 & 4 mixer
CF 5 GHz
CF 20 GHz
−9.83
+9.83
±0.5
S14B Sets path to either band 1 & 2 mixer or band
3 & 4 mixer
CF 5 GHz
CF 20 GHz
+9.67
−9.67
±0.5
VCC1 Voltage always on 4.8 ±0.5
VCC2 Voltage always on 4.8 ±0.5
VCC3 Voltage always on 7.85 ±0.5
VCC4 Voltage always on 5.0 ±0.5
VCC5 Voltage always on 5.0 ±0.5
TWAD1 Amplifier bias to A13 RF Front End
Assembly
6.0 ±0.5
TWAD2 Amplifier bias to A13 RF Front End
Assembly
6.0 ±0.5
Table 5-10 Front End Control Logic
Test Point Description Instrument
Settings
Voltage
(VDC)
Tolerance
(VDC)