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Introduction

If your Kenwood Chef develops a strong smell and starts emitting smoke, most likely a capacitor in the motor control electronics is broken. Use this guide to change the broken parts in an A901D. In order to do this, you need some skills in soldering. If you are new to this, our guide may be useful.

  1. This old A901D started to heavily smoke while running. In the motor electronics, a failed capacitor was the reason for the  smoke. It was replaced, along with other electronic components. It was a triac BTA08-600CW, a block capacitor 150 nF, a blocking capacitor 470nF and a resistor 150 kOhm. All components can be had for a few pennies a piece.
    • This old A901D started to heavily smoke while running. In the motor electronics, a failed capacitor was the reason for the smoke. It was replaced, along with other electronic components. It was a triac BTA08-600CW, a block capacitor 150 nF, a blocking capacitor 470nF and a resistor 150 kOhm. All components can be had for a few pennies a piece.

    • Remove all accessories like bowl and mixer

    • Remove the power cord from the outlet

  2. Flip the machine upside down, so that the bottom is facing up. Remove the two screws from the cable strain. Remove the white cable staple.
    • Flip the machine upside down, so that the bottom is facing up.

    • Remove the two screws from the cable strain. Remove the white cable staple.

    • Remove the single screw from the cover of the junction box.

    • Remove the two screws from the wire connector. Remove the power cable and place it aside.

  3. Remove the screw that holds the cable connector to the motor cover.
    • Remove the screw that holds the cable connector to the motor cover.

    • Let the connector fall through the square hole in the motor cover.

  4. Open the pedestal. Remove the two screws that secure the retention plate holding down the motor cover . Remove the retention plate.
    • Open the pedestal.

    • Remove the two screws that secure the retention plate holding down the motor cover .

    • Remove the retention plate.

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  6. Take out the motor cover. It is held under the axle of the pedestal.
    • Take out the motor cover. It is held under the axle of the pedestal.

  7. The motor control electronics are now exposed. For other models, the control board looks different. But you can often recognize the defective capacitor(s). Replace them and any additional defective resistors (if any). The triac is under a lot of stress and brakes easily. Replace it if necessary. The components listed are all very cheap. In this case The 150 nF block capacitor, the adjacent 470nF capacitor, the 150 kOhm resistor and the triac BTA08-600CW were broken. They were replaced. 150 nF block capacitor
    • The motor control electronics are now exposed. For other models, the control board looks different. But you can often recognize the defective capacitor(s). Replace them and any additional defective resistors (if any). The triac is under a lot of stress and brakes easily. Replace it if necessary. The components listed are all very cheap.

    • In this case The 150 nF block capacitor, the adjacent 470nF capacitor, the 150 kOhm resistor and the triac BTA08-600CW were broken. They were replaced.

    • 150 nF block capacitor

    • 470 nF block capacitor

    • 150 kOhm resistor

    • Triac type BTA08-600CW

  8. Unscrew the two speed adjustment screws. Remove the springs and the screw retention clamps.
    • Unscrew the two speed adjustment screws. Remove the springs and the screw retention clamps.

    • This is a simple explanation of how the speed regulator works: At the end of the motor shaft is a magnet. This induces a coil on the PCB to a different degree, depending on distance. The initial distance of the magnet can be adjusted with the adjustment screws and the large control button. This regulation also keeps the speed constant under load.

  9. Remove the thermal fuse from its holder.
    • Remove the thermal fuse from its holder.

    • Desolder the cables connected to the on/off switch.

    • Pull out the printed circuit board carefully.

    • Remove the two screws that secure the board to the plastic case.

    • (In the picture, all the steps were already completed.)

  10. In the first picture, three of the four components were already desoldered. Unscrew the triac. Note the thermal compound on the heatsink of the triac. Thermal paste will be applied to the new triac later. In the second picture, the replacement components were all soldered back. The capacitors have a slightly different size though.
    • In the first picture, three of the four components were already desoldered. Unscrew the triac. Note the thermal compound on the heatsink of the triac. Thermal paste will be applied to the new triac later.

    • In the second picture, the replacement components were all soldered back. The capacitors have a slightly different size though.

  11. The thermal fuse is inserted, the On/Off-switch is waiting to be soldered.
    • The thermal fuse is inserted, the On/Off-switch is waiting to be soldered.

  12. Everything is  completed and ready to be reassembled. The on / off switch is soldered, the adjusting screws are screwed in and the circuit board is attached to the case with both screws. (Second photograph) Make sure that the pin on the support of the circuit board is engaged  in the guide on the knob (marked by the red rectangle). If you turn the knob, the circuit board needs to be able to move up and down a bit, otherwise the machine will not work later!
    • Everything is completed and ready to be reassembled. The on / off switch is soldered, the adjusting screws are screwed in and the circuit board is attached to the case with both screws.

    • (Second photograph) Make sure that the pin on the support of the circuit board is engaged in the guide on the knob (marked by the red rectangle). If you turn the knob, the circuit board needs to be able to move up and down a bit, otherwise the machine will not work later!

  13. Adjusting of the speed control after repair:
    • Adjusting of the speed control after repair:

    • Turn both adjustment screws only until you can feel them flush with your fingertips on the rear side of the screw holes. Then turn the screws two turns more.

    • Set the speed adjuster to the lowest setting.

    • Attention: high voltage, don't reach with your fingers into the motor.

    • Plug in.

    • The motor should run slowly.. The correct speed for the planetary drive ist 60 rpm.

    • Adjust the speed by turning the adjustment screws evenly.

    • Remove the power cord and reassemble your device following the steps in reverse order.

Conclusion

After adjusting the speed control, follow the steps in reverse order for reassembly.

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VauWeh

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