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Code C710, CRTC Switching Circuit Problem: Notes

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. CRT/DID monitor needs communication from the CRT/DID controller to initially illuminate. Therefore, if CRT monitor lights initially, it is receiving signals from controller.
  2. If CRT/DID is blank at times and Code C710 is set, monitor is not receiving data intermittently.
  3. Checks voltage on CRT controller-to-CRT/DID data line. Normal voltage is between 1.5 and 4.5 volts and fluctuates some.
  4. Checks whether CRT/DID or CRT controller is causing low voltage reading on data line.
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