Brother International PR-620 Users Manual - English - Page 222

Symptom Probable Cause Remedy Reference Page There are loops in the upper thread. The thread tension does not correspond to the amount that the thread tension knob was tightened. The thread quality is poor. If the thread tension cannot be adjusted, thread wax and dust may have collected in the upper or middle thread guide plates, causing the thread tension guide plates to rise. Clean the thread tension guide plates. Try sewing with different thread. If the problem no longer occurs after the thread is changed, the thread quality is the problem. Replace the thread with one of good quality. Lint may be wound in the hook. Clean the hook. p.193 The upper thread is not threaded Check the thread path, and then correctly. thread the upper thread again. p.35 The machine is noisy. Replace the hook. The hook is damaged. Consult your nearest authorized dealer. Not enough oil was applied. Oil recommended parts. p.196 Touch the key to move the The needle is not at the correct desired needle bar to be position. threaded into embroidering p.40 position. The needle threader cannot be used. Recommended needles are not used on this machine. The needle is not installed correctly. Replace and use recommended needle. Correctly install the needle. p.15, 63 p.15, 63 The hook on the automatic needle-threading mechanism is bent. Consult your nearest authorized dealer. p.15, 63 The thread tension is incorrect. The upper thread is not threaded Check the thread path, and then correctly. thread the upper thread again. p.35 The bobbin thread is not correctly threaded. Correctly thread the bobbin thread. p.19 The lower thread tension is incorrect. Adjust the tension of the bobbin thread. p.85 The upper thread comes out of the needle when embroidering begins. If a short length of thread remains after the thread is trimmed, the needle may become unthreaded when embroidering begins again. Set the remaining length of thread to "LONG TAIL" on the second page of the settings screen. p.150 The upper thread does not reach the bobbin thread when embroidering begins. There is no more thread in the bobbin, the thread does not feed from the bobbin, or the thread that is fed from the bobbin is too short. Correctly thread the lower thread. 7 p.19 Troubleshooting 205