Code C710, CRTC Switching Circuit Problem: Notes

Test Number 1)  CRT monitor needs communication from the CRTC to initially illuminate. Therefore, if CRT monitor lights initially, it is receiving signals from CRTC.

Test Number 2)  If CRT is blank at times and Code C710 is set, monitor is not receiving data intermittently.

Test Number 3)  Checks voltage on CRTC to CRT data line. Normal voltage is between 1.5 and 4.5 volts and fluctuates some.

Test Number 4)  Checks whether CRT or CRTC are causing low voltage reading on data line.