2. Service
Assembly/Module Diagnostic Trees (Diagnostic Section 3)
104
3.5.4.0 A10 Port-2 Test
1 Connect port 2 on the rear panel to the 50 input of a scope using coax. (If
a 50 input is absent, use the high impedance input with a 50 coaxial
feedthrough terminator at the scope end of the coax).
2 Verify presence of a sine wave.
QUESTION: Does the scope show a sine wave with amplitude of at
least 5.6 Vp-p and a frequency of 5 or 10 MHz (selected,
from front-panel
Config/Output menu).
If Yes: Go to, 3.5.5.0.
If No: Go to, 3.5.4.1.
3.5.4.1 A10 Port-2 Frequency Error (10, not 5 MHz)
QUESTION: Is the Port-2 output 10 MHz when it should be 5 MHz?
If Yes: Go to, 3.5.4.1.1.
If No: Go to, 3.5.4.2.
3.5.4.1.1 A10 Port-2 Frequency Selection Error Test
1 Connect a clip lead from SEL B on A10 to chassis ground.
2 Recheck port 2 with scope.
3 Verify presence of 5-MHz output.
4 Remove clip lead.
QUESTION: Does the frequency remain at 5 MHz?
If Yes: Remove power, replace A7, and retest
If No: Remove power, replace A10, and retest.
3.5.4.2 A10 Port-2 Frequency Error (5, not 10 MHz)
QUESTION: Is the Port-2 output 5 MHz when it should be
10 MHz?
If Yes: Go to, 3.5.4.2.1.
If No: Go to, 3.5.5.0.
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