Editing Atari SC1224 Troubleshooting Guide (section)

== Before opening the monitor ==
{| class="wikitable styled-table" style="width:70%; text-align:left;"
|+'''First checks'''
! Symptom !! Check
|-
| Picture rolls or tears || Set the vertical and horizontal hold controls on the back panel. On the CA-3 these are V-HOLD (R603) and H-HOLD (R716).<ref name="ca3-ctl" /><ref name="v2-func" />
|-
| No picture with a working ST || The SC1224 shows only the ST's low and medium resolutions. A program that needs high resolution needs the monochrome monitor.<ref name="specs86" /><ref name="wp-st" />
|-
| Colour patches after moving the monitor || The degaussing coil runs for about one second at switch-on. Leave the monitor off for at least ten minutes, then switch on again.<ref name="ca3-adj" />
|-
| Monitor shuts down and stays dead || The CA-3's X-ray protection circuit latches the horizontal oscillator off. Switch off for at least 30 seconds before trying again, then look for the cause of the over-voltage.<ref name="ca3-theory" />
|-
| Picture missing or one colour missing || Check the signal cable and the 13-pin plug; both Atari charts start from the input signal.<ref name="ca3-flow" /><ref name="v2-ts" />
|}