Skip to main content

BROTHER SEWING MACHINE 681B-UG: SMALL ELECTRICAL SHOCK ON FOOT PEDAL

hi, this is our classic Brother electric sewing machine. it is very old. But, still works fine. Model is similar to 681B-UG

brother sewing machine model 681B-UG



Unfortunately, for the past few weeks, there are little problem with the foot pedal which caused slight leakage current when operate the machine. was not sure where the problem coming from. but, I try to investigate using my little knowledge about this kind of thing.

At first, I am looking at the basic things like connection inside the main plug, cable that connect from main plug to the machine, whether any damage have been occur or not to its insulation/disconnect etc. However, nothing have been found

So, I start to disconnect the cable that connect to the motor and light via white connector to identify the problem..what I found is one of the ground cable are damaged. This caused disconnect between Earth cable from main plug and the machine body.
Foot pedal ydk yc-180

after realised that issue and fix the connection. 
Then, I the got problem to reconnect the cable after fixing the earth issue. 
Twice tripping my house ELCB in main board supply. After that, I have to tracing the circuit in sewing to make sure my connection are correct....

and here you go,...


Circuit diagram for the Brother sewing machine


I prepared the layout circuit diagram for my Brother sewing machine..Hopefully, these will help anyone that having the similar problem on this similar machine.

Thank you very much


Labels:

Comments

Post a Comment

Popular posts from this blog

HONDA RS150 TPS: RPM TAK STABIL BILA NOT ON THROTTLE DAN PENYELESAIANNYA

Assalamualaikum dan salam sejahtera Isu TPS ni berlaku pada tahun lepas, Ogos 2020 (milage dalam 24000km, baru dua tahun pakai) sewaktu saya on the way ke KL Masa tu tunggang motor full throttle yang menyebabkan RPM nya selalu mencecah ke CUT-OFF (utk makluman, honda RS150 saya ni tak guna ECU custom, masih guna yang standard). Jadi saya perasan, bila selalu tunggang pada RPM yang sampai CUTT-OFF, ini menyebabkan kesan tak baik pada TPS..jadi utk yang belum jadi problem TPS ni..boleh la cepat ganti ECU ke ECU yang tanpa cutoff. APA TU TPS? TPS bermaksud Throttle positioning sensor..bahasa mudahnya alat ni bertujuan untuk mengesan kedudukan throttle body valve dimana udara masuk ke enjin untuk pembakaran. Dengan itu, baru la ECU tahu berapa banyak bahan bakar yang perlu utk pembakaran berdasarkan bukaan valve tu.  Bila TPS dah problem, TPS akan memberi maklumat yang salah pada ECU berkenaan besar mana valve tu buka, jadi nisbah bahan api dan udara jadi tak betul la. maka, tu yang jadi s
Post a Comment
Read more

HONDA RS150 IACV: IACV PROBLEM? RPM NAIK TINGGI BILA HIDUPKAN ENJIN?

 Hi semua, Salam sejahtera Masalah IACV saya berlaku selepas isu TPS wujud di milage 24000+km..kemungkinan kedua2nya ini saling berkait. Masalah IACV hadir ketika saya on the way balik semula ke Johor, ketika bahan bakar berkurang dari tangki moto. SIMPTOM  ? bila hidupkan enjin honda RS150 saya, RPM akan naik tinggi dan kadang2 sukar dikawal. tengah jalan pun, jika stop di trafik light, rpm akan naik tinggi dan mengaum bising..so, isu ni biasanya disebabkan IACV IACV APA TU IACV? IACV bermaksud Idle Air Control Valve. bahasa mudahnya nak control udara masuk ke ruang pembakaran sewaktu motosikal kita idle (tanpa pulas pendikit atau throttle) iaitu semasa tak bergerak. FUngsi dia mcm choke la pada motor lama yg guna karburator supaya moto mudah di hidupkan dan dalam masa sama injap dikawal dan dikecilkan bila enjin motosikal telah panas. IACV idling control valve (anak panah, lubang udara yang dikawal) APA FUNGSI IACV? Jika kita dah pulas throttle, IACV dah tak digunakan dan valve udara
4 comments
Read more

HONDA RS150: MAINTENANCE SCHEDULES & MOST COMMON SERVICE WORK

Hi all, this is based on the guide book supplied with your motorcycle when you purchased your motorcycle. With this guide table, hopefully, easy for all, planning their motorcycle service. for me, its really useful since I'm doing my RS150 maintenance myself. The list below shows the most common maintenance schedule and what I did for my RS150 (already 22000+km after almost 9 months): Engine oil change, Petronas Sprinta F700: replace every 1600km Oil strainer: clean every 12000km Spark plug: replace every 12000km (can replace with a high-performance spark plug to reduce maintenance frequency) Fuel filter: replace every 18000km Coolant fluid: replace every 12000km following oil strainer clean work Below are is the maintenance schedule from the guide book. Hope this sharing help
4 comments
Read more