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Repairing a Kenwood Chef A901D That Emits a Burning Smell

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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.

Neye ihtiyacın var

  1. Repairing a Kenwood Chef A901D That Emits a Burning Smell, Motor Control board: adım 1, 1 resimden 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.

    Çevir

  2. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 2, 2 resimden 1. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 2, 2 resimden 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.

    Çevir

  3. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 3, 1 resimden 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.

    Çevir

  4. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 4, 3 resimden 1. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 4, 3 resimden 2. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 4, 3 resimden 3.

    • Open the pedestal.

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

    • Remove the retention plate.

    Çevir

  5. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 5, 1 resimden 1.

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

    Çevir

  7. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 6, 3 resimden 1. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 6, 3 resimden 2. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 6, 3 resimden 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

    Çevir

    The replacement capacitors must be X2 rated for safety. I would suggest polypropylene for longer life (PP), the originals are oiled paper.

    Tim - Yanıt

    Bonjour, ou passez commande pour avoir les mêmes dimensions que ceux d'origines ? merci

    150 nF, (RM 20 mm)

    470 nF (RM 15 mm)

    100 nF (RM 20 mm)

    150 kOhm

    Triac BTA08-600CW

    Damiano - Yanıt

  8. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 7, 1 resimden 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.

    Çevir

  9. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 8, 1 resimden 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.

    Çevir

  10. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 9, 1 resimden 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.)

    Çevir

  11. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 10, 2 resimden 1. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 10, 2 resimden 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.

    Çevir

    Hello. I have replaced all the components as per your awesome step by step guide but when switched on, the motor is erratic and I see there is a spark from the black component under the red cable. The black component is not visible on the pics. I would really love to identify that component please. Thank you again.

    Ashik Moorley - Yanıt

    Sorry, I am not sure which part that could be. Hmm. Can you post a picture?

    VauWeh - Yanıt

    Hi, I do have a picture but it does not allow me to post. Its a A901D model. The component can not be seen on any of the pics and its not the triac. Its next to the last block capacitor (the one, you didnt replace or name), its a small thin, black cylinder. I am sorry about the bad description. If you can give me your email, I can forward you the picture. I really appreciate the assistance.

    Ashik Moorley -

    OK, I hope I can identify that part, but currently don't have an A901D. My email is za311(replace by at sign)lehrer.uni-karlruhe.de

    VauWeh -

    Could it be a 901 as seen here? In this case there is no PCB and the components are soldered “flying". The component under the red cable (in a 901) is the triac.

    VauWeh - Yanıt

    Thank you so much. I have sent an email.

    Ashik Moorley - Yanıt

    it did not go through - my is ashik.moorley(at sign here)gmail.com

    Ashik Moorley - Yanıt

  12. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 11, 1 resimden 1.

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

    Çevir

  13. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 12, 2 resimden 1. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 12, 2 resimden 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!

    Çevir

  14. Repairing a Kenwood Chef A901D That Emits a Burning Smell: adım 13, 1 resimden 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.

    Çevir

    Excellent work of You! Thanks!Have a very old Kenwood Chef A901D. Sometimes it works normal than it switches to max speed and stays runing fast. Rotating the speed control to max does not hear any speed increase, maybe a little bit. Than removing power waiting longer it lets start run normal. Sometimes i can change the speed and than it switches spontaneously to max speed again. Think maybe the thyristor plays crazy….. i could imagine to replace but not the whole electronic stuff. Or is this the speed measurement sending wrong signals to thyristor?

    Marek Oses - Yanıt

    The repair is quite simple, I would replace all of the specified parts, they are inexpensive. Good luck!

    VauWeh -

    Hallo, auf der LP-Elekronik ist eine Spule eingelötet, die für die Drehzahlkontrolle verantwortlich ist. Die Spule hat einen Unterbruch und ist defekt. Kann mir jemand den Induktivitätswert in H, oder den Widerstand nennen? Vielleicht finde ich ein Bauteilehersteller, aber ich muss die Werte angeben können. Vielen Dank im Voraus.

    M. Fischer

    Matfis - Yanıt

    Hab die Spule extra ausgelötet und in den China-Komponententester gesteckt:

    28,5 Ohm und 6,1mH

    Leonard Penzer -

    Hello, my sister's mixer "went bang when running" and stopped. The run capacitor had exploded so I changed all 5 items as described here but mixer still not working. Tested exposed wiring with meter and all seems ok. Unable to check 3 motor windings as I don't know where they go. Any suggestions what I can do next? I noticed what looks like a "klixon" on motor top housing but seems to only have 1 pink wire running to it but can't easily check this due to poor access. Is this pink wire the same as runs with the other red & blue wires to the motor through a pvc sheath? Is the other wire from the klixon running through the motor housing to windings? I'd really appreciate some advice as the mixer is old but very little used. Thank you very much, Jim Crewdson. (jimcrewdson@hotmail.com)

    Jim Crewdson - Yanıt

Sonuç

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

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VauWeh

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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 - Yanıt

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 - Yanıt

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

VauWeh -

Excellent instructions. I appreciated the details about setting up the speed control again. A clever induction mechanism!

Andrew May - Yanıt

Thank you for your excellent guide. Was easy to follow and have my Kenwood back up and running.

The only glitch is the speed setting - it seems to intermittently go straight to full speed and often then does not respond to the speed control knob, and occasionally if turned back to the lowest setting will respond to the knob once more. Are you aware of which component is at fault here?

Reece van Buren - Yanıt

Look for the second picture in step 11. Are you 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, you must watch the circuit board to move up and down a few millimeters!

VauWeh -

Thanks for the reply @vauweh, yes, the pin is properly in the guide rail and moving the board as described.

Reece van Buren - Yanıt

Hmmm. Perhaps the circuit diagram here, step 9, helps. The transistor might have an issue ? The magnet? Good luck!

VauWeh -

@vauweh the diagram somewhat escapes me unfortunately. I've replaced the 0.15uF (which blew) and 0.1uF capacitors and the triac. Still the same issue. I've recorded a video of the issue for reference if that is any further help. I've also checked the resistance of the resistors which seem OK, is there a chance that they need replacing too? Could the other capacitors also be a potential cause?

https://1drv.ms/v/s!Aqc9HhNSfzeYg9AWozlm...

Reece van Buren - Yanıt

Strange, I never saw this before, a diagnosis without seeing it difficult. The induction magnet might be loose/broken? Perhaps buying an old used device, like this one, and replacing the parts would be the better solution?

VauWeh -

First of all many thanks for this great instruction. Unfortunately my Kenwood (Model: 907d) broke down yesterday with a lot of smoke. Now I need your help to identify the defective parts (see images). Beside the defective capacitor (0,1 µF) probably the resistor and the diac should be replaced. Unfortunately I can't see the colour coding exactly. According to SoubhiS' circuit diagram for the models A902/A904 it is a 56 Ohm resistor (green, blue, black, silver). In my case the two middle colors are not visible anymore, the last one is definitely not silver, more like brown or gold. Do you think it's a 56 Ohm resistor with a smaller tolerance or could it have a completely different value? Right above the resistor is the diac, which I should probably replace too. Can you tell me what value it has? Last but not least: The capacitor on the opposite side (2.2J100) also looks a bit bloated, which part can I replace it with? Thanks for your help!

https://imgur.com/9jFQ6ZB

https://imgur.com/tXZvOzE

Julian - Yanıt

First: I never worked on a 907D, so I might be wrong!

The most important part, which can be broken, is the triac BTA08-600CW, not the diac. If you want to replace the diac, use a DB3. The capacitor might be the 2.2uF, but I'm not sure. And yes, I don't expect a big difference between 901 and 907, so replace the resistor with 56 Ohm. (The resistor between diac and gate of the triac). The parts, which normally are broken are two capacitors and the triac, as sold e.g. here.

Try it, all parts are cheap. Good luck!

VauWeh - Yanıt

Great explanation, on my machine the capacitors had failed, was particularly helped out by the part covering setting up the spring loaded speed adjustment screws. Thanks a million. Jack, Neu Seeland

Jacques van selm - Yanıt

Great that I could help - so far away. Greetings from europe!

VauWeh -

Bei mir waren die beiden Entstörkondensatoren 0,1u und 0,15u sowie der direkt danebenliegende Widerstand 56Ohm defekt.

Merci für die Anleitung!

Richard Hegg - Yanıt

Hello,

many thanx for this guide, it was easy to fix the Kenwood. But, I tried to regulate the Speed and destroyed the ring magnet. can you maybe tell me the size of this Magnet, or a store where I can order it? it broke in a lot of single parts, so I cannot measurements the size anymore. And I don’t wanna push this great Machine in the trash cause a small magnet.

Many Thanks in advance

Frank Bauer - Yanıt

Oh oh. This ist a very special art, sorry I don’ t know a place to buy. Perhaps here? Ask them, good luck.

VauWeh - Yanıt

I took a look there, I doesn't´t look this good. I know where to buy all forms and types of magnet, but I need the size. Maybee someone here read my comment and can measure it for me.

Trotzdem vielen Dank für den Link

Frank Bauer -

Maybe that's the best dealer: https://kenwoodchefrestore.co.uk

VauWeh - Yanıt

Many Thanks for the Link, I´ll take a look

Frank Bauer -

Die Anleitung ist perfekt !!! wir hatten schon zwar darüber kommuniziert ich ging aber der Anleitung meines Bruders (E-Ing) erst nach und habe , ziemlich fürchterlich alle Lötstellen nachgelötet. Dann hat der Mixer mehrere Male sehr gut funktioniert aber bei zwei letzten Malen hat sich die Maschine erst 10-20 Sekunden nach dem zuschalten in Bewegung gesetzt. Jetzt tut sich nichts mehr …… Habe schon nach Kenwood A901 Leiterplatte PCB Kpl 230V gesucht aber die war nur aufgelistet als nicht verfügbar.

Sollte ich nach Ihrer Anleitung die Teile austauschen? Gibt es irgendwo solche Leiterplatte zu kaufen?

Marek Oses - Yanıt

Ich würde tatsächlich erst mal die genannten Teile austauschen, sind nicht teuer. Oben gab es noch Rückmeldungen, dass die Induktionsspule kaputt war. Aber grundsätzlich ist es eine sehr unkomplizierte Platine und unkomplizierte Teile. Das Schaltbild ist im obigen Beitrag von soubhiF . Viel Glück.

VauWeh -

Thanks a lot!!! Will try to repair it . Hopefully will not damage everything …. Have to order first a proper soldering iron as the old one does not work properly. All the best and stay healthy !

Marek Oses - Yanıt

Have replaced the parts as recommended, Than I connected the 220 V current and have tried to start the motor, unfortunately without any success. e Motor did not start to work. Taking the wires away I have got a slight e stroke, the condensers seem to work?

Now I do not know what I should do. Is there any procedure to check If the control board needs some further repair? May I connect the motor directly to power to see if the motor still works or it will be dangerous for the connected control board?

You are also showing that the induction device may have a problem. Do you have the type of this Part?

i have purchased this very old Kenwood for 30€ and that What I am doing is more for fun in this stupid corona time as for a real need. I could also bring the parts to a professional shop for repair but in this case it would be more effective to buy a new one….

With best regards, Happy Eastern and stay healthy!

Marek

Marek Oses - Yanıt

Sorry, too difficult to say without sitting in front of the machine. Hmm, perhaps you can get another A901D or a used PCB? Does Souhib's diagram help? According to Leonhard Penzer’s post the coil has 28,5 Ohms and 6,1mH.

VauWeh -

Having not working Kenwood mixer I have prepared the baguette dough by my hands. It was 25 minutes of really heavy work but the result was much better as with the mixer - the most probably reason is that making the dough by hands the erecting gluten layers are not getting damaged and are keeping the structure. Anyhow the baguettes are much better , close to perfect!

Having a standard kitchen oven i could put only three baguettes of 300 g each. This for 20-25 minutes at 250 C….. So preparation of 12 baguettes has consumed together 6 hours (many steps) work and a lot of electrical energy …..

Most probably in normal, non corona, times I would not do electrical repairs and bakery studies but it was so interesting!

Thanks a lot! And the life of the Kenwood Chef is still not finished - my brother as electro engineer should be capable to check the electrical issues. Thanks and stay healthy!

Marek Oses - Yanıt

Hi, I would like to share with you the findings made by my brother. The electronic control card with the replaced items accordingly to your advices works perfectly !!! The issue is that the motor was really overloaded and is damaged in high degree …… most probably it was the last dough preparing process as the body of the mixer was really warm but I did not switch off having in mind the switch which should switch down but did not…..

the motor wiring is partially dark, the coal elements are glued with the plastic casing. After some repairs He could start the motor but it was not running .

so now I am stopping the further repairs, had a lot of fun playing with this old machine for 30 €, have learned a lot.

and my hands are better than the mixer so I will continue with the baguettes and finish my involvement in the electronic issues. It was a lot of fun, thank you so much for the so helpful cooperation! All the best!

.

Marek Oses - Yanıt

Thank you very much for your report, I loved to hear your story. Hope the next Kenwood will do better, this are great machines. Have a good time with your bread, would like to taste it.

VauWeh - Yanıt

Thank you thank you thank you!

I purchased an old km210 on ebay, it worked…. until i made a sponge cake…. after a couple of minutes… smoke and a loud bang! the reset button had been triggered…too late.

The board is very very similar to the one above and i was able to get the parts and complete the repairs…. i am back in business!

This unit is for the cottage as i have “newer” km210 that i have been using for years … and a lot of attachments for it, now i can use the attachments between both of them.

However, the “newer” unit, has some speed issues… after a while, sometimes, it goes full speed and i can only unplug the unit to stop it. I turn it off, plug it back, and it is “normal” again…

Soon, i will need to tackle this issue :)

Thank you,

André F.

andre fontaine - Yanıt

Excellent guide, well done! But can you make a copy of the circuit diagram for the A901E available please. Also where can I buy the 0.1microfarad (100nf) 285vac capacitor which has blown?

Regards Alan

Agent 006 - Yanıt

As Soubhif wrote in his first post:

https://www.instructables.com/Kenwood-Ch...

The 901 is nearly the same. Concerning the capacitor: depends from your country. This is a very common type and you can easily buy it at any store for electronics or even at amazon/ebay.

VauWeh -

Very useful instructions. Great to have my very old Kenwood working again. Thank you.

Just one question: Do you know if the old capacitors (from 1980) are likely to contain PCBs?

Ferg McCulloch

Borderbiker - Yanıt

Good question, I don't know - but I don't think so.

VauWeh -

Hey! Yesterday my Kenwood Major 230 started smelling like as it was burnt. I need your help! I don't know where to find the components to repair my beloved machine, so many years working insanely well.... I link a photo and lets see if you can help me! i want to repair it for christmas so i can bring it to my mother again... Contact me at iraventos7@gmail.com or at discord if you have at Nachete Stalone#4210

https://imgur.com/a/BAOB2wF

https://imgur.com/a/gURDVc8

Please, help me! I really would like to repair this little machine but the fact that is so old is doing this almost impossible. I still dont't know how i found this site...

Nacho Raventos - Yanıt

Bonjour,

Avez-vous un tutoriel pour démonter la boite de vitesses de cet appareil ?

Cordialement.

franswafix - Yanıt

La boite der vitesses de Kenwood sont très similaires. Consultez ce tutorial: Disassembling Kenwood Chef A701A Gearbox and Orbital Mixer assembly

VauWeh -

Bonjour, j'ai terminé et " réussi" à voir si ça va tenir , les composant reçu était trop court , souder limite en tirant un peu , une après midi pour réaliser le travail , un grand merci à ceux qui créer ces tutos , rené

Damiano - Yanıt

Thank you very much for this great guide.. Great job explaining in details. Saved my mom's kenwood Chef.
My mom thanks you ♥

M. G. - Yanıt

Thumbs up, greetings to mom. Did you replace the feet, (for better ventilation) so it does not happen again?

VauWeh -

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