E8257D/67D, E8663D PSG Signal Generators Service Guide 125
Troubleshooting
Troubleshooting the RF Path
Troubleshooting Problems >3.2 GHz
12.If the pulse modulation problem occurs >3.2 GHz, remove the cable A30
Modulation Filter J7 (W17). Probe the end of the cable. Compare the
results with Table 1-23.
13.If the signal levels are good, replace the A30 Modulation Filter.
14.If the signal levels are bad, check the cable continuity. If the cable is bad,
replace the cable. If the cable is good replace the A11 Pulse/Analog
Modulation Generator.
Troubleshooting AT1 Attenuator
The attenuator in a E8267D signal generator steps (changes levels) every
5 dBm. In a E8257D Option 513/520/532/540 signal generator the attenuator
steps 5 dBm for the first change, then ever 10 dBm. In a E8257D 550/67 signal
generator the attenuator steps every 10 dBm.
1. If the attenuator switches at the switch points but the power does not
change or the power changes more or less than expected, replace the
attenuator.
2. If the attenuator does not switch, press: Utility > more 1 of 2 > Instrument
Info > Options Info
An Option 1E1 should be listed.
3. If Option 1E1 is not listed, the option is either not installed or the
configuration file is bad. The signal generator will need to be returned to
Keysight for service.
4. If Option 1E1 is listed, turn the signal generator off and remove W36 from
J13 on the A26 MID.
5. Turn the signal generator on and probe the following pins on J13.
— Pin 1 +15 Vdc ±0.75 Vdc
— Pin 2 +5.2 Vdc ±0.5 Vdc
Table 1-23
Pulse On Pulse Off
+5 Vdc 0 to +5 Vdc (pulses at modulation rate)
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