JUKI MEB-3200 Engineer's Manual page 99

Adjustment Procedures
1. When returning the looper thread trimming unit, apply an
adequate amount of grease to the sliding section of the shaft,
spring, etc. Perform the respective adjustments referring to the
items of the adjustment related to the looper thread trimming.
2. After attaching the looper thread trimming unit and knife cover,
immediately change memory switch No. 22 from "0" to "1". Error
will occur when the pattern is beyond sewing length (cut length
+ taper bar length) of 38 mm.
(Caution) If memory switch No. 22 is held as "0", the pattern
which is beyond sewing length of 38 mm does not become
an error. If the pattern beyond 38 mm is sewn by mistake
when attaching the looper thread trimming unit and the
knife cover, it is very dangerous since needle breakage or
component breakgs will be caused. Never perform pattern
sewing beyond 38 mm (or idle running) when attaching
the looper thread trimming unit and the knife cover.
Results of Improper Adjustment
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