Sony SAL20F28 Service Manual page 7

1-5-2. Focus Trouble
NG
Replace the defective part
or apply the grease.
NG
SAL20F28 (2.0/28) (20mm F2.8)
Function NG
Check the coupler.
OK
OK
Check the outer barrel
and focus ring.
NG
Replace the defective part
or apply the grease.
Check the operation
again.
OK
Focus trouble
reinstall the main
flexible unit.
Clean the pattern of the
main flexible unit.
1-4
Position NG
NG
Check the installation of
the main flexible unit.
OK
NG
Check pattern
of the main flexible unit.
OK
Replace the
main flexible unit.
Check the foecusing
operation again.
OK
END
NG