2. Service
Assembly/Module Diagnostic Trees (Diagnostic Section 3)
103
3.5.3.1.1 A10 Port-1 Frequency-Selection Error Test
1 Jumper the SEL-A terminal on A10 to chassis ground.
2 Recheck port 1 with scope.
3 Verify presence of 5-MHz signal.
4 Remove clip lead.
QUESTION: Is a 5-MHz signal present?
If Yes: Remove power, replace A7, and retest.
If No: Remove power, replace A10, and retest.
3.5.3.2 A10 Port-1 Frequency Error (5, not 10 MHz)
QUESTION: Is the port 1 output 5 MHz when it should be 10 MHz?
If Yes: Go to, 3.5.3.2.1.
If No: Go to, 3.5.4.0.
3.5.3.2.1 A10 Port-1 Frequency Selection Error Test
1 Check SEL A on A10 with a DMM.
2 Verify that it is no greater than 2 volts.
QUESTION: Is the SEL A voltage 2 or less?
If Yes: Go to, 3.5.3.2.2.
If No: Remove power, replace A10, and retest.
3.5.3.2.2 A10 SEL-A Line Test
1 Remove instrument power.
2 Unsolder white wire from SEL-A terminal and re-check with DMM.
3 Reapply instrument power.
4 Verify that voltage on wire is greater than 2 volts.
QUESTION: Is voltage greater than 2 volts?
If Yes: Remove power, replace A7, and retest.
If No: Remove power, replace A10, and retest.
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