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| 8. ELECTRIC MECHANISM |
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| Error status | #9 Work clamp does not rise. |
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| Probable causes |
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| Check/ repair/ adjust |
| Parts to be replaced |
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| <Solenoid specifications> |
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| 3. Work clamp is not raised | a. If it does not rise because of mechanical |
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| although attempted, when no |
| problem, see |
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| error code appears or error |
| tions of the presser solenoid.” |
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| code | b. Separate P5 (SOL) connectors on the |
| Work clamp lifter sole- |
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| display window. |
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| main circuit board, and measure the |
| noid |
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| • Presser bar lifter solenoid |
| resistance between pins 3 and 4 in the |
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| defective |
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| connector on the cable. |
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| If the resistance is |
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| problem. After measurement, rejoin P5 |
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| connectors. |
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| If the resistance is 0 ohms (it means a |
| Main circuit board |
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| short circuit), replace the main circuit |
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| board with a new one because it may be |
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| defective. |
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| c. If the work clamp lifter solenoid does not |
| Main circuit board |
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| 3641Q |
| operate at all, the main circuit board is |
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| defective. |
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| <Pneumatic specifications> |
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| 4. The air valve is defective. | • | Pull out connector P14 (AIR) on the main |
| Air | valve | harness |
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| circuit board and measure the resistance |
| assembly |
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| between the following pins in the |
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| connector on the cord: |
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| Pins 1 and 10 (air valve for right work |
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| clamp) |
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| Pins 2 and 10 (air valve for left work |
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| clamp) |
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| Pins 3 and 10 (air valve for presser foot) |
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| 3642Q |
| The resistance in each case should be |
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| 300 – 400 Ω. |
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| 5. The main | • | Disconnect connector P14 (AIR) from the |
| Main circuit board |
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| defective. |
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| main circuit board, then turn on the power |
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| and measure the voltage between the |
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| circuit board connectors while turning the |
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| work clamp switch on and off. |
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| Pins 1 and 10 (air valve for right work |
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| clamp) |
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| Pins 2 and 10 (air valve for left work |
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| clamp) |
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| Pins 3 and 10 (air valve for presser foot) |
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| The voltage in each case should be +20V |
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| to 24V. |
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| (The solenoid valve LED will light while |
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| the power is on.) |
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| After measurement, turn off the power, |
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| 3643Q |
| wait at least 5 minutes, and insert P14. |
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| Error status | #10 Work clamp does not lower. (Solenoid specifications only) |
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| Probable causes |
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| Check/ repair/ adjust |
| Parts to be replaced |
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| 1. Work clamp is not raised | • | Same as |
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| when error code |
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| appears | on the | display |
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| window. |
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| 2. Work clamp is not lowered | • | Same as |
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| although | attempted | when |
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| error code |
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| the display window. |
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184 |