Sony SAL50M28 Service Manual page 7

1-5-2. Foucus Trouble
NG
Replace the defective part
or apply the grease.
NG
SAL50M28 (MACRO 2.8/50) (50mm F2.8 Macro)
Function NG
Check the coupler and
gear block.
OK
Check the fixed holding
OK
tube block and
fixed barrel unit.
NG
Replace the defective part
or apply the grease.
Check the operation
again.
OK
Focus trouble
Adjust the position, or replace
the A encoder brush.
Clean the pattern of the
main flexible block.
1-4
Position NG
Check the position
NG
and deformation
at the tip of the
A encoder brush.
OK
Check pattern
NG
of the main flexible block.
OK
Replace the
main flexible block.
Perform the
brush position
check/adjustment.
(See page 4-17.)
OK
END
NG