Chapter 12 Troubleshooting
Symptom | Measures |
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Thread is frequently tangled in the | • Is thread tangled in the rotary hook? |
rotary hook. | Clean the rotary hook. |
•Conduct BC sensor test of the test mode.
If there is any failure, replace the lower shaft module with a new one.
•Conduct automatic
Replace the lower shaft module with a new one if there is any fault.
•Check to see if the lower shaft fan of the head with which the error frequently occurs is correctly rotating.
If the fan is at standstill, check to see if connection from the lower shaft fan to the BC PCB is proper. Replace the lower shaft fan with a new one.
•If all the lower shaft fans are at standstill, check fuse F4 on the power supply PCB in the control box.
•Is the hole next to the bed with which the error frequently occurs clogged with dust?
If so, clean it.
The lower shaft motor zero point er- | • Is thread tangled in the rotary hook? |
ror occurs. | Clean the rotary hook. |
•Is the lower shaft with which the error occurs rotating?
If so, check to see if connection from the lower shaft sensor PCB to the BC PCB is proper. Adjust the lower shaft sensor. Replace the lower shaft sensor PCB with a new one.
•If the lower shaft with which the error occurs is not rotating, check to see if connection from the lower shaft motor to the BC PCB is proper. Replace the lower shaft module with a new one. Replace the BC PCB with a new one.
The lower shaft motor standby posi- | • Is the rotary hook rotated manually? |
tion error occurs. | This is not a fault. |
•Check to see if connection from the lower shaft sensor PCB to the BC PCB is proper. Replace the lower shaft module with a new one.
The lower shaft overheat error oc- • | Check to see if the lower shaft fan is normally rotating. If the fan is at |
curs. | standstill, check to see if connection from the lower shaft fan to the BC |
| PCB is proper. Replace the lower shaft fan with a new one. |
• | If all the lower shaft fans are at standstill, check fuse F4 on the power |
| supply PCB in the control box. |
• Is the hole next to the bed with which the error frequently occurs clogged | |
| with dust? |
| If so, clean it. |
• Check to see if connection from the thermister of the lower shaft module | |
| to the BC PCB is proper. |
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