Electronic Quick Check - Kenmore 385.190011890 Service Manual

SEWING MACHINE DIV. 20 MODEL 385.19001890
ELECTRONIC QUICK CHECK
I.CHECKING
TURN THE POWER SWITCH ON.
*IF NOTHING HAPPENS ON THE MACHINE;FIRST, REPLACE THE FUSE(SEE PAGE 50)
1. CHECK ALL WIRE CONNECTIONS (SEE PAGE 5),
2. CHECK THE C-BOARD (SEE PAGE 50).
CHECK THE TRANSFORMER (SEE PAGE 51).
CHECK THE SOCKET (SEE PAGE 52),
IF THE C-BOARD,TRANSFORMER AND SOCKET ARE ALL OK, AND
NOTHING HAPPENS ON THE MACHINE, REPLACE THE A-BOARD (SEE PAGE 53).
*IF SEWING LIGHT DOES NOT TURN ON;
1. CHECK THE FILAMENT IN THE LIGHT BULB.
IF THE FILAMENT IS BROKEN, REPLACE THE LIGHT BULB.
2. IF LIGHT BULB IS OK, AND LIGHT STILLDOES NOT TURN ON, REPLACE
THE A-BOARD (SEE PAGE 53).
*IF LCD DOES NOT TURN ON;
1, TURN THE SCREEN SHARPNESS ADJUSTMENT DIAL.
2. IF LCD STILLDOES NOT SHOW ANYTHING, REPLACE THE A-BOARD FIRST.IF
LCD STILLDOES NOT TURN ON, REPLACE THE LCD.
*IF LCD SHOWS NOTHING;
1. REPLACE A-BOARD FIRST.IF LCD STILLSHOWS NOTHING, REPLACE THE LCD.
2.PREPARATION
_BECAREFUL IN CHECKING ALL OPERATIONS SINCE THE MACHINE MAY
SUDDENLY STARTRUNNING,
1. TURN THE POWER SWITCH OFF,
2. SETTHE BOBBIN WINDER SPINDLE TO THE LEFT,
3. RAISE THE FEED DOG.
4. SHIFTSPEED SETTING SLIDE LEVER TO THE LEFT.
5. DETACH THE PRESSERFOOTAND RAISE THE PRESSER FOOT LIFTER.
6. MOVE THE NEEDLE BAR TO THE UP POSITION.
7, CONNECT THE FOOT CONTROL.
8. LOWERTHE BH LEVER,
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