Qixing QD686 Electronic System Fault Analysis and Inspection Methods

repair_副本

  • The LED doesn’t work

check the F2 fuse, it might turn off

图1

check DB1, inspect whether the voltage output is normal or not

图2

check R33 resistance

图3

  • The panel display nothing

Check the R1 and R2 resistance

图4

Check the ZN1 voltage regulator tube.

图5

  • It shows OFF when opening

Check R129 resistance

图6

Check R130 resistance and U11 Optocoupler

图7

  • The fault shows that the functions of cutting, sweeping lines, rewind seam, presser foot are faulty

Check 7A fuse

图8

Check U20/74HC04D

图9

Check Q1-Q4

图10

  • The fault is E-7

Check the socket of motor and encoder

图11

Check the motor and encoder

图12

  • The fault is E-8

Check the switch of handle rewind seam

图13

Check position sensor

图14

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