JUKI SC-20 - Reverse Feed Continues Without Stopping; Automatic Reverse Feed Fails but One-Touch Type Reverse Feed Operates

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)
)
Operation
Trouble
What to check
Repair
B) Automatic reverse feed
fails but one-touch type
reverse feed operates.
AUTO
O Check for unplugged
connector.
Main circuit board
J60 (SC-120, SC-220),
J61 (SC-320)
C) Automatic reverse feed
works but one-touch
type reverse feed fails to
operate.
AUTO
5-2 Reverse feed continues without
stopping.
(T) Does automatic reverse feed still fail ifa new control boxis
installed?
Yes
(T) Is the reverse feed switch good?
Connector P49 1 to 2 switch ON 0
switch OFF
Yes
(T) Does the monitor LED (BT) onthe main circuit board fail to light up?
Yes
(2) Does replacing the transistor circuit board correct the problem?
Yes
No^ Replace control box.
Replace PSC box.
No.
Replace reverse feed switch.
Replace main circuit board.
No.
Replace PSC box.
No.
Replace PSC box.
Replace BT transistor circuit board.
From the library of: Superior Sewing Machine & Supply LLC