User`s guide

Troubleshooting Symptom Charts/Focus - 7
Focus
Focus poor 1 Using the Monitors & Sound control panel, verify that
convergence is set correctly. Maladjusted convergence gives
the appearance of bad focus.
Note: Convergence over entire screen is never perfect.
2 Using the Display Service Utility (inside the Diagnostics
Utilities folder on the Service Source Companion CD), select
focus pattern. For best screen focus, use a plastic adjustment
tool to adjust H focus and V focus controls that are mounted
on the flyback transformer.
3 If focus is still poor, one of the CRT socket wires may be
improperly secured. Refer to the Take Apart chapter to
secure the red and white wires correctly in the CRT socket.
4 Readjust the focus controls. If adjusting focus controls has no
effect, replace main deflection board. If necessary, repeat
step 2 and step 3.
5 Replace CRT/video board only if the service strategy in your
region supports CRT/video board replacement.
6 US only: Call Apple Technical Support at 1-800-919-2775.
H Focus
V Focus