Sony TRINITRON 17VC Operation Manual page 31

Age monitor Yes
and check for
focus change
No
11
(See Parts Level Board
Repair Section)
POOR FOCUS
E
Adjust
focusVRs
Improved
focus?
No
Check focus leads
from FBT to CRT
socket
Check CRT socket
Is dynamic focus
circuit OK?
Yes
Replace CRT
and verify
focus
Done
- -
31