C Code Charts

Code C710:

CRTC Circuit:

TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.

1. The Cathode Ray Tube (CRT) monitor needs communication from the Cathode Ray Tube Controller (CRTC) to initially illuminate. Therefore, if the CRT monitor lights initially, it is receiving signals from the CRTC.

2. If the CRT is blank at times and code C710 is set, then the monitor is not receiving data intermittently.

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

4. Checks whether the CRT or CRTC are causing the low voltage reading on the data line.

NOTE ON INTERMITTENTS:

Check connections at the CRT monitor and controller. If both connections are clean and tight, either the CRT monitor or the controller could be at fault.