Samsung CF21M Service Manual page 67

5 Troubleshooting
5-2-7 Poor Focus
Adjust focus VR.
Improved focus?
No
Check focus leads from
FBT to CRT Socket.
Check the CRT Socket.
Dynamic focus circuit is right?
Yes
Replace the CRT and verify focus.
5-2-8 Purity Failure
Degaussing
Purity is right?
No
Degaussing circuit is right?
Yes
Replace CRT and verify purity.
5-18
Yes
Aging monitor and
check for focus change.
No
Refer to 5-1-15 Dynamic
Focus Failure.
Yes
Done.
No
Refer to 5-1-20 Degaussing Failure.
CF21M*