2. Service
Assembly/Module Diagnostic Trees (Diagnostic Section 3)
123
3.9.1.4.1. EFC Voltage Test (2)
1 Unplug the A19 oscillator from A1-J11 and repeat the measurement
procedure described in 3.9.1.3.
QUESTION: Do the measured and calculated EFC voltages agree to
within 0.03 volts?
If Yes: Remove power, replace A19, and retest.
If No: Remove power, replace A6, and retest.
3.9.1.5 A19 Oven Warm-up Time Test
1 Power-cycle the instrument.
2 Wait 10 minutes.
3 Observe the value of the A19 (VCXO) oven monitor using the
INFO/Ovens menu.
4 Verify that the voltage is now be between -10.0 and -5.0 volts, indicating that
the oscillator oven has warmed up.
QUESTION: Does the A19 oven warm up in 10 minutes or less?
If Yes: Go to, 3.9.1.6.
If No: Remove power, replace A19, and retest.
3.9.1.6 A19 Signal-Amplitude Test
1 Disconnect the semi-rigid cable from A9J5.
2 Use the adapter cable to connect it to the input of the oscilloscope with a 50
terminator.
3 Verify that the amplitude of the signal, is greater than 1.0 Vp-p.
QUESTION: Is the signal amplitude greater than 1.0 Vp-p.
If Yes: Go to, 3.9.1.7.
If No: Remove power, replace A19, and retest.
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