Specifications

Troubleshooting Symptom Charts - 7
Focus
Focus poor 1 Open Monitors & Sound control panel, and adjust
Convergence for best overall convergence.
Note: Misadjusted convergence is often diagnosed as poor
focus.
2 Run the Display Service Utility (DSU), and select the focus
pattern (percent signs). Adjust horizontal and vertical focus
controls (two top controls on the flyback transformer) for
best center-of-screen performance. If necessary, readjust
each focus control to optimize overall focus.
3 If the focus varies between the center of the screen and the
outer edge, run the DSU and click the H-Focus button to
improve the dynamic focus (overall focus with respect to
center, sides, and top/bottom of screen). If necessary,
repeat step 2.
4 If focus is still poor, one of the CRT socket wires may be
improperly secured. Refer to “CRT/Video Board” in the Take
Apart chapter to secure the red and white wires correctly in
the CRT socket.
5 Refer to “Adjusting Screen Convergence” in this chapter.
6 Call Apple Technical Support. (In the US, call 1-800-919-
2775, option 3.)