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Troubleshooting
Troubleshooting Unlocks
625 Internal Pulse Generator Unlock
A 625 internal pulse generator unlocked message indicates a failure on the A11 Pulse/Analog
Modulation Generator.
• Replace the A11 Pulse/Analog Modulation Generator.
626 Internal Mod Source Unlock
A 626 Internal Mod Source Unlock error message indicates a problem with the digital 10 MHz
signal to the A11 Pulse/Analog Modulation Generator. This error message is turned on if the signal
generator is in phase modulation mode and there is a problem with the 10 MHz digital signal to the
in phase clock.
1. Set the signal generator to phase modulation mode.
2. Measure pin P131–91. The waveform is not a sine wave, but more like a distorted pulse
waveform >2 V
pp
.
3. If the waveform is present, replace the A11 Pulse/Analog Modulation Generator.
4. If the signal is not present, replace the A7 Reference.
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