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Troubleshooting the Analyzer
To troubleshoot the power supply
4 Check the A95 Main Power Supply assembly’s bias supply voltages.
a Check the bias supply voltages in the following table.
The ripple should be no more than 50 mVp-p. Do not include high
frequency line noise when measuring ripple.
b If any of the voltages are incorrect, the A95 Main Power Supply is
probably faulty.
The A95 Main Power Supply assembly has no adjustments.
Therefore if a voltage is incorrect, replace the assembly.
c If the voltages are correct and the fan is turning, go to Step 7.
5 Check the supply voltage fuse for the A102 Fan assembly.
a Set the power switch to off (
O ).
b Wait five minutes to allow time for the power supply capacitors to
discharge.
c Measure the resistance across A95 F353.
d If the resistance is greater than
0Ω, replace the fuse.
Te st
Location
Nominal
Voltage
Minimum
Voltage
Maximum
Voltage
Ripple
Tole ra nce
U341, pin 3 +5 V +4.5 V +5.5 V 50 mVp-p
U340, pin 2 +12 V +11.4 V +12.6 V 50 mVp-p
U350, pin 3 −12 V −12.6 V −11.4 V 50 mVp-p
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