Brother International MD-817 Service Manual - Page 49
Brother International MD-817 Manual
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ITEM PROBLEM #1 No "click" sound and from brake when #2 power is switched ON. Control box lamp doesn't illuminate. CHECK • Is the connection of the 4-pin or 3-pin power plug correct? • The fuse has blown. (For 3-phase, fuse on the outside of control box has failed. For single-phase, 15A fuse on the power board has failed.) * Fuse fails again after replacement. • The fuse (8A fuse inside the control box) has blown. • Other than that above. PROBABLE CAUSE Power plug is incorrectly connected. Fuse has blown. Malfunction of 8A fuse, the control printed-circuit board. Malfunction of the control printed-circuit board. REMEDY Connect the power plug correctly. Replace the fuse. Replace the motor and control box. Replace the fuse and control box. Replace the control box. #3 No operation box • Does the operation box lamp is illuminated. function correctly? (YES) Bulb failure-no functional problem. (NO) Malfunction of the operation Replace the operation box. box. • Other than that above. Malfunction of the control Replace the control box. printed-circuit board. #4 Machine starts when power is switched ON. Malfunction of the control printed-circuit board. Malfunction of the D printedcircuit board. (single phase 110V or higher) Replace the control box. Replace the control box motor. #5 Machine operate. doesn't • Does the control box lamp flash? (YES) Large torque (head). Reduce the torque. Malfunction of control Replace the control box. printed-circuit board Malfunction of treadle unit. Replace the control box. • Is there a motor noise? (YES) Large torque (head). Reduce the torque. Malfunction of treadle unit. Replace the control box. • Other than the above. Malfunction of treadle unit. Replace the control box. Malfunction of treadle unit. Replace the control box. Adjust VR TRIM (LOW). Machine operates in reverse. Unsuitable low- speed operation. Machine operates at Malfunction of treadle unit. Replace the control box. high speed. #6 Machine doesn't stop when treadle is set at neutral. Synchronizer installation position is not suitable. Synchronizer malfunction. Control printed-circuit board malfunction. Position adjustment: 0.5mm Replace the synchronizer. Replace the control box. #7 Operation speed • Uneven operation at Malfunction of treadle unit. doesn't correspond treadle maximum. Malfunction of control box. to amount of treadle • Initial operation speed is Malfunction of treadle unit. depression. fast (no low-speed range). Replace the control box. Replace the control box. Replace the control box. - 45 -