E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Assembly–Level Problems
1-24
If a supply LED is not lit, or a measured voltage is less than the acceptable value, an assembly may be loading down
that supply. Using the appropriate Power Supply vs. Assembly Matrix, determine where each supply is used, then use
the following steps to isolate the defective assembly.
CAUTION Remove a minimum number of assemblies at one time. If the power supply does not have a minimum
load on it, the supply voltage increases to an overvoltage condition.
1. Turn off the instrument and remove one of the assemblies biased by the faulty supply.
2. Turn the instrument on and check the faulty supply. If the supply LED lights, replace the assembly removed in
Step 1. If not, continue with Step 3.
3. Turn the instrument off and reinstall the assembly removed in Step 1. Remove the next assembly and see if the
supply LED lights. Continue this process until the supply functions properly.
4. Replace the last assembly that you removed.
+5.2 D 5.2 ± 0.16 20 –7.0 –7.0 ± 0.21 10
+3.4 3.4 ± 0.1 10 –15 –15 ± 0.45 10
+2.6 D 2.6 ± 0.08 10
Table 1-14 E8267D Supply Voltage Specifications
Supply
Voltage
Acceptable
Volt age
(Vdc)
Maximum
Ripple
(mVpp)
Supply
Voltage
Acceptable
Voltage
(Vdc)
Maximum
Ripple
(mVpp)
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