With CRT/DID

TEST DESCRIPTION
Numbers below refer to circled numbers on the diagnostic chart.
1. Checks power supplies to CRTC/DIDC.
2. Determines whether the CRT/DID/CRTC/DIDC system is awake and operating.
3. Checks voltage on the CRTC/DIDC to CRT/DID data line. Normal voltage is between 1.5 and 4.5 volts and fluctuates some.
4. Checks whether the CRT/DID or CRTC/DIDC are causing the low voltage reading on the data line.