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Troubleshooting Procedures
1780R-Series Service Manual
6–27
Figure 6–8: A. Q250 collector waveform. B. Q250 base waveform. C. Q350–Q451
emitter waveform. D. U460 pin 3 waveform. E. U460 pin 4 waveform
24. Install a plug jumper on J122. Connect the test oscilloscope probe to the
+5 V supply. Supply should turn on in short bursts and not increase beyond
+6.5 V. See Figure 6–9.