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| 11. ELECTRICAL MECHANISM |
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| Cause | Inspection/Remedy/Adjustment | Replacement if a malfunction |
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| 5. When [Err 91] is displayed: | Repeat the standard settings for the treadle | - |
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| Problem with treadle unit settings | unit. (Refer to |
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| treadle depression stroke”.) |
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| 6. When [Err 450] is displayed: | (Replace the part(s) indicated at right.) | Machine head memory unit |
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| Problem with machine head |
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| memory data; Model selection |
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| cannot be loaded |
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| 7. When [Err 452] is displayed: | Check that connector P6 | Machine head memory unit |
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| Machine head memory cannot be | into the main P.C. board. |
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| verified. |
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| 8. When [Err 403] is displayed: | 1) Check that connector P31 (PMD) is inserted | Harness, PMD P.C. board, |
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| Poor connection between main | into the main P.C. board and that connector | main P.C. board |
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| P.C. board and PMD P.C. board | P1 (MAIN) is inserted into the PMD P.C. |
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| board. |
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| 2) Check if there is a harness | Harness |
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| 9. When [Err 401] or [Err 411] is | Turn the power switch off and back on again. | Main P.C. board |
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| displayed: |
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| Main P.C. board communication |
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| error |
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| 10. When [Err 700] is displayed: | Check that the power supply voltage at the wall | - |
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| Abnormal rise in power supply | outlet is within the range of the specification |
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| voltage | voltage +/- 10%. |
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| 11. When [Err 705] is displayed: | Check that the power supply voltage at the wall | - |
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| Abnormal drop in power supply | outlet is within the range of the specification |
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| voltage | voltage +/- 10%. |
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| 12. When [Err 101] is displayed: | Set DIP switch No. 4 to OFF and then turn the | - |
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| DIP switch No. 4 on the main P.C. | power switch off and back on. |
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| board is ON |
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| 13. When [Err 200] is displayed: | Check that connector P5 (PMD) is inserted into | Needle zigzag motor or PMD |
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| Needle zigzag motor is not | the PMD P.C. board. | P.C. board |
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| connected |
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| 14. When [Err 131] is displayed: | Check that connector P13 (ENC) is inserted | Sewing machine motor or main |
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| Encoder cord of sewing machine | into the main P.C. board. | P.C. board |
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| motor is not connected. |
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Problem No. 3 “UP” is displayed when the power switch is turned on.
Cause |
| Inspection/Remedy/Adjustment | Replacement if a malfunction |
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Malfunction of encoder P.C. board in | 1) | Turn the pulley to move the needle bar to | Encoder P.C. board in sewing |
sewing machine motor |
| the needle up stop position. | machine motor |
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| 2) | Check if the needle up signal remains on. |
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98 |