Code C710, CRTC Switching Circuit Problem: Notes

Fig 1: Code C710, Wiring Diagram (Reatta & Riviera) CRTC Switching Circuit Problem

Fig 2: Code C710, Wiring Diagram (Toronado) CRTC Switching Circuit Problem

NOTE: Test numbers refer to numbers on diagnostic chart.

1. CRT monitor needs communication from the CRTC to initially illuminate. Therefore, if CRT monitor lights initially it is receiving signals from CRTC.
2. If CRT is blank at times and Code C710 is set, monitor is not receiving data intermittently.
3. Checks voltage on CRTC to CRT data line, normal voltage is between 1.5 and 4.5 volts and fluctuates some.
4. Checks whether CRT or CRTC are causing low voltage reading on data line.