1-12
Troubleshooting the Analyzer
To perform initial verification
5 Check frequency reference signals.
a Turn the analyzer upside down.
b Remove the bottom cover.
c Press
[Preset].
d Using an oscilloscope and a 1
MΩ 10:1 probe with a grounding
spanner, check the TTL signals in the following table.
The probe may load the 64 MHz, 48 MHz, and 80 MHz signals
causing their amplitude level to be low.
e If a signal is incorrect, replace the probable faulty assembly.
Before replacing the A60 Frequency Reference assembly, go to
page 1-15, ‘’To troubleshoot the power supply,’’ and do Step 7 to
check the power supply voltages.
Test Location Ground Connection Frequency Probable Faulty Assembly
A91 P6 pin 16 A91 P6 pin 15 25.6 MHz A60 Frequency Reference
A91 P6 pin 11 A91 P6 pin 12 25.6 MHz A60 Frequency Reference
A91 P6 pin 18 A91 P6 pin 19 3.2 MHz A60 Frequency Reference
A91 P4 pin 5 A91 P4 pin 6 378 kHz A61 Clock
A91 P4 pin 21 A91 P4 pin 22 64 MHz A61 Clock
A91 P4 pin 24 A91 P4 pin 23 48 MHz A61 Clock
A91 P4 pin 25 A91 P4 pin 26 80 MHz A61 Clock
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