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Knitting machine Brother Kh910, card reading test 881 have error 3?

Knitting machine Brother Kh910, card reading is not work. I try to follow the Service Manual for modified Kh 910. I test the card reading by put no.881 and push M key, it show error no.3. I have ask the electronic guy to adjust VR501 and check pin CH501. However, i don't have a special card to put in the machine for the mark sensor checking. So, I try to adjust at the black mark on the original printed Mylar sheet, and then adjust the VR 501 to low the voltage to 0.6 volt. Then, i test no.881 again. It' s still error no.3. So, how to fix the card reading? do i need the special card? I bought this machine from ebay and ship to Thailand, Southeast Asia. Please help and recommend.

Prapapan Thailand
August 2014

Brother Household Appliances, Sewing Machines Knitting Machine 3

I have the same problem and is 2018. When I get an answer I will share it here for you.

cindy
June 2018

Hi!
I have a problem with my knitting machine "brother 910" and the mylar sheets does`t work i checked the fuseand they work,i have also charged the batteries for many hours when i turn the machine on,it lights up normally and it programming as usual,but the mylar sheets doesn`t go down.Can someone help me out plese??
thanks

mirta
January 2016