5 Troubleshooting
5-18 720C/920C
Improved focus?
Check focus leads from FBT
to CRT Socket.
Check the CRT Socket.
No
Aging monitor and check for focus
change.
Yes
Is dynamic focus circuit right?
Refer to 5-1-15 Dynamic
Focus Failure.
Replace the CRT and verify focus.
Yes
No
Adjust focus VR.
5-2-7 Poor Focus
5-2-8 Purity Failure
Purity is right?
Degaussing circuit is right?
Refer to 5-1-20 Degaussing Failure.
Replace CRT and verify purity.
Yes
No
No
Done
Yes
Degaussing
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