Keysight Technologies E8257D - Page 90

90 E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Assembly–Level Problems
1300 Power Supply
— Replace the A11 Reference.
1301 Internal Pulse Generator Clock
1. Using an oscilloscope, measure P131–91 for a 10 MHz signal at 3.5 V
pp
.
— If the signal is good, replace the A11 Pulse/Analog Modulation
Generator.
2. If the signal is bad, check P41–7.
— If the signal is good on P41–7, replace the A31 Motherboard.
— If the signal is bad on P41–7, replace the A7 Reference.
1302 Output
— Replace A11 Pulse/Analog Modulation Generator.
1303 Voltage Ref DAC
— Replace A11 Pulse/Analog Modulation Generator.
1304 20 GHz Pulse
— Replace A11 Pulse/Analog Modulation Generator.
1305 Not Used
1306 Standard 3 GHz Pulse
— Replace A11 Pulse/Analog Modulation Generator.
1307 High Performance 3 GHz Pulse
— Replace A11 Pulse/Analog Modulation Generator.
1308 Numeric Synthesizer
— Replace A11 Pulse/Analog Modulation Generator.
+5.2 Digital high P131–64, 65, 129,
130
+5.04 +5.36 Main Supply
+3.4 Digital Low P131–60, 61, 62, 63,
125, 126, 127, 128
+3.29 +3.5 Main Supply
Supply Voltage
(Vdc)
Connector Pins Minimum Value
(Vdc)
Maximum Value
(Vdc)
Origin