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Repairing a Kenwood Chef A901D That Emits a Burning Smell

Introduction

If your Kenwood Chef A901D starts emitting smoke and a strong burning smell, most likely a capacitor in the motor controller is broken. Follow this guide to change the broken parts in a Kenwood Chef A901D. To do this, you need some skills in soldering. If you are new to soldering, our guide may be useful.

What you need

  1. Repairing a Kenwood Chef A901D That Emits a Burning Smell, Motor Control board: step 1, image 1 of 1

    • An old A901D started emitting smoke and a strong smell while running. Failing components in the motor control circuit were causing the smoke. Components replaced were a BTA08-600CW triac, a 150nF block capacitor, a 470nF block capacitor and a 150 kOhm resistor. All components can be purchased for a few pennies.

    • Remove all accessories like the bowl and mixer.

    • Remove the power cord from the outlet.

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  2. Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 2, image 1 of 2 Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 2, image 2 of 2

    • Flip the machine upside down, so that the bottom is facing up.

    • Remove the two screws from the white cable strain relief strip, then remove the strip.

    • Remove the screw from the box covering the power wire connector.

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

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  3. Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 3, image 1 of 1

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

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

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  4. Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 4, image 1 of 3 Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 4, image 2 of 3 Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 4, image 3 of 3

    • 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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  5. Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 5, image 1 of 1

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

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  7. Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 6, image 1 of 3 Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 6, image 2 of 3 Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 6, image 3 of 3

    • The motor control electronics are now exposed. For other models, the control board may look 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 100 nF capacitor, the 150 kOhm resistor and the triac BTA08-600CW were replaced.

    • If you don't have all the parts, you should definitely replace the two oil paper capacitors 100 nF and 150 nF. It is best to use MKP capacitors, X2 - class, at least 275 V. The space between the connections (pitch) should fit, bend the connections slightly if necessary. (e.g. if the pitch is 22 mm instead of 20 mm)

    • 150 nF block capacitor (pitch 20 mm)

    • 470 nF block capacitor (pitch 15 mm)

    • 100 nF block capacitor (pitch 20 mm)

    • 150 kOhm resistor

    • Triac type BTA08-600CW

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  8. Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 7, image 1 of 1

    • Here is a picture of the two oil paper capacitors. They break more easily, the case cracks. Replace them with more modern MKP types.

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  9. Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 8, image 1 of 1

    • 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.

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  10. Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 9, image 1 of 1

    • 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.)

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  11. Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 10, image 1 of 2 Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 10, image 2 of 2

    • 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.

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  12. Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 11, image 1 of 1

    • The thermal fuse is inserted, the power switch is not soldered yet.

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  13. Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 12, image 1 of 2 Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 12, image 2 of 2

    • 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.

    • Make sure that the pin on the support of the circuit board is engaged in the guide rail on the knob (marked by the red rectangle in the second picture). 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!

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  14. Repairing a Kenwood Chef A901D That Emits a Burning Smell: step 13, image 1 of 1

    • 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.

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Conclusion

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

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48 Comments

I need help. I changed the capacitors ,the resostor snd the triac, but the motor will not start. i have supply on the pink wire too. after some time the motor starts and stops. checked all the diodes found ok except one which i have changed. any ideas what i need to check? brushes ok too. can you please send me on jusmar1@hotmail.com

qoxra - Reply

Hi,

To detect the issue:

you should

1- Try to shrot the main switch and the main thermo protection.

2- Try to bypass the dimmer circuit. by removing the triac from the circuit. Then short MT1 and MT2 place of the triac.

go to my instructables and find out the schematic.

https://www.instructables.com/id/Kenwood...

Regards,

SoubhiF -

@SoubhiF: Your guide ist great! Thank you for sharing.

VauWeh -

Excellent instructions and it all worked for me and saved our old Kenwood. Bought it back in 1988 now working perfectly after replacing the Diode, 2x Capacitors and resistors with the motor brushes. well done and thank you. Mike Baggot 26/04/2020

Mike Baggot - Reply

I'm lucky I could help ! Greetings from Germany.

VauWeh -

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