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2. TENSION OF MOTOR BELT AND TIMING BELT.............................................22
3. NEEDLE DOWN POSITION ADJUSTMENT......................................................23
4. TIMING OF NEEDLE AND ROTARY HOOK
(CLEARANCE BETWEEN THE NEEDLE AND THE ROTARY HOOK POINT)....24
7. FRONT/BACK, LEFT/RIGHT POSITION OF FEED DOG..................................26
10. POSITION OF BUTTONHOLE SWITCH LEVER ...............................................29
14. INNER ROTARY HOOK BRACKET POSITION.................................................32
15. INNER ROTARY HOOK TENSION ....................................................................32
16. FEED ADJUSTMENT (VERTICAL FEED) .........................................................33
(CHECKING THE HOOK POSITION IN HORIZONTAL DIRECTION)...............34
19. NEEDLE THREADER (EXCHANGE) .................................................................35
20. NEEDLE THREADER (CHECKING THE HOOK IN STANDARD POSITION)...35
(CHECKING THE HOOK POSITION IN VERTICAL DIRECTION) ....................36
Summary of Contents for BL7800
Page 1: ...4 2001...
Page 4: ...2 1 MECHANICAL CHART...
Page 9: ...7 1 DISASSEMBLING AND REASSEMBLING THE OUTER PARTS AND MAIN PARTS 8 2 LEAD WIRE ARRANGEMENT 19...
Page 15: ...13...
Page 17: ...15...
Page 19: ...17...
Page 21: ...19 2 LEAD WIRE ARRANGEMENT...
Page 43: ...41 Main PC board...
Page 44: ...42 Power supply unit Power 120 Power 230...
Page 45: ...43 Operation board Other PC boards...
Page 46: ...BL7800 T1010141...