2. Service
Functional-Group-Diagnostic Trees (Diagnostic Section 2)
78
2.3.3.0 A19 Output Amplitude and Frequency Test
1 Program frequency counter to use internal timebase. (The frequency counter
timebase must be calibrated to ensure an accuracy of 110
-
7
or better.)
2 Disconnect the semi-rigid cable from A9J5.
3 Use the adapter cable to connect it to the input of the oscilloscope with a 50
terminator.
4 Verify that the amplitude of the signal, is greater than 1.0 Vp-p.
5 Disconnect semi-rigid cable from the oscilloscope.
6 Connect frequency counter input to A19 output, and measure frequency.
7 Reconnect A19 output to A9J5.
QUESTION: Is frequency 10 MHz, 5 Hz?
If Yes: Go to, 2.3.4.0.
If No: Go to, 3.9.1.1 (A19 diagnostic tree).
2.3.4.0 A10 Port 1 and 2 Amplitude Test
1 Program the rear-panel output ports for 10 MHz.
2 Use an oscilloscope to verify that both output provide a sine wave with an
amplitude of at least 2.8 Vp-p into 50 . Record results.
QUESTION: Are both port amplitudes 2.8 Vp-p?
If Yes: Go to, 2.3.5.0.
If No: Go to, 3.5.1.0 (A10 diagnostic tree).
2.3.5.0 A10 Output Frequency Test
1 Program frequency counter to use its internal timebase. (The frequency
counter timebase must be calibrated to ensure an accuracy of 110
-
7
or
better.)
2 Connect the rear-panel port 1 output to the frequency counter input.
3 Measure the frequency.
QUESTION: Is frequency 10 MHz, 5 Hz?
If Yes: Go to, 2.3.6.0.
If No: Go to, 3.4.1.0 (A9 diagnostic tree).
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