I inherited an old machine from my Mother in law a with all the period attachments and was thrilled that it worked......for about an hour before it started to smoke and an elec component melted and fried ! This video was simply perfect to lead me in the right direction to try to fix it. Thank you so much for uploading this. Cant thank you enough . Its not the value of the item (after all new ones are not that pricey) but the sentimental associations it has for her. I will certainly try a fix now !
Very useful - especially the close-ups. I replaced the capacitors and burnt out resistor. And it works, just too fast at low speed. Apparently there is a low-speed adjustment, but I can't find on the web where it is in the machine. Thanks.
Do you know where I can get a parts diagram for the 901 motor? I have several shims that go on the armature but don't know the order. I took photos along the way but these fell off when extracting the armeture from the housing.
Hi, I note than when you test the motor out of the machine, it has a tendency to "pulse" randomly. Mine does the same (almost sounding like a little 2 stroke petrol engine!) at intermediate speeds but not at min or max. Is this normal? Many thanks for your informative video
FixItWorkshop Worthing wish I could send you pics of board what’s the best way to do this. Not sure what size original capacitors are as they got bit burned on surface. Any idea how I could send you pics? Thanks for your trouble. Perhaps I could repay the favour in Western Hemisphere one day 😀
Thank you for your response. The machine worked for a little while during of which I noticed some sparks coming from the motor. I replaced the carbon brushes but still it does not work. Do I need a motor, if so where can I find a new one? any idea of cost? Thanks again!
Hi Kostas, it's normal for some small sparks at high speeds or under load, but excessive sparking could be down to a few things. You could try and find a good second-hand unit on eBay or www.kenwoodchefrestore.co.uk or www.kenmixengineering.co.uk. I'm not affiliated with either company, but I know they are well regarded. Before condemming your motor, maybe check the connections you've just soldered.
I just got the same model and after 2min of use on bread mix it made a loud "crack", smoked and smell (but didn't stop until I did), one of the capacitor is cracked and burnt so I know what needs to be replaced but I was wondering if the gear box needs to be all cleaned and greased with new grease because it's such an old mixer or should it be ok with an updated circuit board?
Thanks for this vid! I just picked up a gorgeous space orange A910 like yours in Germany for 30 euros, all running but smelled of smoke the moment is was switched on. Took it apart and turned out the only issue was the belt was walking up the spindle. I haven't done it yet but I suspect I play with the adjusting bushes under the high speed take off to realign. Have you played with these at all? The motor is running a little lumpy at low speed so I thought I might as well replace these parts too. Thanks for the tip! I managed to buy the components separately from an online electronics component retailer here in Germany for under 3 euros, the postage cost 6 but 9 euros in total. Looking forward to the fix and getting it back up and running properly for another fifty years :D
The motor pulley should have a white plastic washer on the top which stops the belt riding off and cutting a grove into the underside of the top (plastic) cover. You can adjust the tension using the three bushes; the belt should be slightly loose, i.e. you should be able to squeeze it slightly where it comes away from the motor pulley. The screws for the bushes need to be tight, but don't overtighten as I stripped one of the threads doing this and had to repair with a helicoil kit! The A901 motor is a bit lumpy at low speed, even when it's running well, as the control circuit is fairly crude. A901E has a much improved arrangement with a magnet on the bottom of the motor fan which induces a voltage in a pick up coil on the control module. This gives smoother operation and allows the lowest speed to be set a bit slower than the A901.
@@benjamindaniel8467 Thanks for the response. The washer acts as a back stop but isn't helpful if the alignment is really bad. The key discovery was that if you look at the white bushes holding the screws, they are eccentric. In other words you can tweak them slightly to adjust such that the belt runs true and doesn't "run-in/run-out". Once corrected, the belt ran fine. I even replaced the speed controller electronics for completeness and Have a wonderful machine. It's still lumpy at low revs, I may get a replacement stronger motor at some point, but for now it's just part of the little fella's character. All the best.
@@ZTTINGS thanks for the info; I know that the adjusting bushes are eccentric but I’ve seen the relevant page in the service manual and the thing it says is to adjust them so that the belt is slightly slack and not tight. Glad you got it working well and aligned correctly. The A901 is lumpy at low speed, it’s a crude design of speed control. The A901E motor is much better and has a proper PCB to regulate the speed.
Hi there, I have the A901. It runs but there is a bit of a wiff of burning so I intend to replace the components as stated here however it id VERY noisy. I have tested the machine with the drive belt removed so the noise is for sure coming from the motor assembly. Any ideas before I buy a new motor? Many thanks
Hi David. The 901 was never a really quiet machine, but you could check the motor bearings and brushes. There's a good video on TH-cam explaining the bearing check. Good luck.
Thanks for getting back to me. It isn't just motor noise it sounds like a bag of bolts! I will give the bearings an oil and see if it helps. I suspect it may be time for a new motor though.
Hello, I have the same model machine and i have followed your instructions to replace both capacitors and resistors as well as the triac. the machine run just fine when i tested it. While i was placing the cover, tighting the screws, etc, i accidently pressed the green bottom. since then the machine does not run. can you please assist me?
The green button is a re-setable (in theory) overload button. If it was working, maybe check the connections and give it another press. Maybe check the button for continuity before condemning it.
Hello again. I have had my A901 repaired - I ended up taking it to a shop and getting it done as I didn't have the means, skill or time to do it. It turns out that one of the transistors had gone and it is now working again. So I have this machine alongside my KM300. I was wondering if you could answer a further question for me. Would I be right in thinking that over the years, the speeds at which the different model Chefs run has changed? I notice that the A901 runs noticeably faster on setting 1 than the KM300 does at the same setting.
If it's an A901 (not A901E) the minimum speed should be set to ~60 r.p.m. You can use a stopwatch and time how many times the planet hub goes round in one minute to check it. Later models (A901E, KM200 and early KM300) have a different speed control circuit which uses feedback from a magnet on the bottom of the motor fan to induce a voltage in a pickup coil; these can be set to around 45 r.p.m. at mimimum speed (sometimes slower). The later KM300s have a motor of Chinese manufacture and it's possible that these run even slower at minimum speed. When you raise the top arm of the mixer, if you look at the black pastic motor cover and ventilation slots are visible it has a British motor. If the cover is "solid" (no ventilation slots at the front) it has a Chinese motor.
These capacitors have no polarity markings (from memory). Worthing checking the ones you have, so it shouldn't matter what way they go round. On the kits I've used, I have the writing facing me so I know what type they are. Note, both capacitors are different values.
I got one for just under £100 and I was using it this afternoon, it was fine for the first 5min but suddenly I can smell something and I saw smoke coming out with really bad smelling gas can anyone help me😢
Hello, am hoping you can clarify something for me. I have this exact machine that belonged to my mother and recently retrieved it from my loft loft. When I plugged it in and turned it on it seemed to work just fine, which was encouraging, so I decided to use it. Initially it was fine as it was just mixing some flour and other dry ingredients. I attached the dough hook and added water to the flour (was making bread) so now the machine was operating under a much greater load. Within about 10 seconds smoke started pouring out of the machine although it continued to turn the hook. I immediately switched it off. Would this be the same issue as you are outlining in this video? The reason I ask is because you seem to be implying that the issue you are demonstrating here would result in the machine stopping altogether. I am very keen to repair this machine because it is in such good condition and if I can save it I will. Before I start buying replacement parts I need to be sure that the issue I have is the same as the one you are describing in your video. Thank you.
The symptoms your machine showed would be in-line with one or both of the capacitors failing. Without inspecting the machine, it would be impossible to confirm that. The one in the video failed as both capacitors had expanded with a resistor also going open circuit, causing it not to run. I've also repaired Chefs that carry on working with the rest of the circuit intact but performing badly (motor speed flutter). The best way to confirm your problem is to disconnect from the mains (of course) and inspect all components with a meter. If the components are original (say 35 years plus years old) then the capacitors are probably past their best anyway and would require replacement. While the machine is in pieces, check the motor brush operation and belt tension. You might also want to clean inside the machine too. Good luck.
I inherited an old machine from my Mother in law a with all the period attachments and was thrilled that it worked......for about an hour before it started to smoke and an elec component melted and fried ! This video was simply perfect to lead me in the right direction to try to fix it. Thank you so much for uploading this. Cant thank you enough . Its not the value of the item (after all new ones are not that pricey) but the sentimental associations it has for her. I will certainly try a fix now !
Well done and good luck.
Very useful - especially the close-ups. I replaced the capacitors and burnt out resistor. And it works, just too fast at low speed. Apparently there is a low-speed adjustment, but I can't find on the web where it is in the machine. Thanks.
Thanks mate, great video, short and very helpful. All I need. Thanks
Do you know where I can get a parts diagram for the 901 motor? I have several shims that go on the armature but don't know the order. I took photos along the way but these fell off when extracting the armeture from the housing.
Hi, I note than when you test the motor out of the machine, it has a tendency to "pulse" randomly. Mine does the same (almost sounding like a little 2 stroke petrol engine!) at intermediate speeds but not at min or max. Is this normal? Many thanks for your informative video
Pretty normal
I just did electrical components renewal and during test mine sounds just like motor from this video.
Choose a kit with the latest design capacitors would be my advice- there are plenty of good kits on the Bay.
FixItWorkshop Worthing wish I could send you pics of board what’s the best way to do this. Not sure what size original capacitors are as they got bit burned on surface. Any idea how I could send you pics? Thanks for your trouble. Perhaps I could repay the favour in Western Hemisphere one day 😀
Thank you for your response.
The machine worked for a little while during of which I noticed some sparks coming from the motor. I replaced the carbon brushes but still it does not work. Do I need a motor, if so where can I find a new one? any idea of cost? Thanks again!
Hi Kostas, it's normal for some small sparks at high speeds or under load, but excessive sparking could be down to a few things. You could try and find a good second-hand unit on eBay or www.kenwoodchefrestore.co.uk or www.kenmixengineering.co.uk. I'm not affiliated with either company, but I know they are well regarded. Before condemming your motor, maybe check the connections you've just soldered.
I just got the same model and after 2min of use on bread mix it made a loud "crack", smoked and smell (but didn't stop until I did), one of the capacitor is cracked and burnt so I know what needs to be replaced but I was wondering if the gear box needs to be all cleaned and greased with new grease because it's such an old mixer or should it be ok with an updated circuit board?
Unless it was noisy before, I'm sure that a repaired board will be fine
@@Matt_Marchant_fixitworkshop ok thanks for the quick reply !
Does the frequency or voltage here in Canada change size of capacitors or resistors needed
I wouldn't have thought so, although there may be small variations. Repair kits are readily available from LKS in the UK. Try them for a kit.
Thanks for this vid! I just picked up a gorgeous space orange A910 like yours in Germany for 30 euros, all running but smelled of smoke the moment is was switched on. Took it apart and turned out the only issue was the belt was walking up the spindle. I haven't done it yet but I suspect I play with the adjusting bushes under the high speed take off to realign. Have you played with these at all? The motor is running a little lumpy at low speed so I thought I might as well replace these parts too. Thanks for the tip! I managed to buy the components separately from an online electronics component retailer here in Germany for under 3 euros, the postage cost 6 but 9 euros in total. Looking forward to the fix and getting it back up and running properly for another fifty years :D
The motor pulley should have a white plastic washer on the top which stops the belt riding off and cutting a grove into the underside of the top (plastic) cover. You can adjust the tension using the three bushes; the belt should be slightly loose, i.e. you should be able to squeeze it slightly where it comes away from the motor pulley. The screws for the bushes need to be tight, but don't overtighten as I stripped one of the threads doing this and had to repair with a helicoil kit! The A901 motor is a bit lumpy at low speed, even when it's running well, as the control circuit is fairly crude. A901E has a much improved arrangement with a magnet on the bottom of the motor fan which induces a voltage in a pick up coil on the control module. This gives smoother operation and allows the lowest speed to be set a bit slower than the A901.
@@benjamindaniel8467 Thanks for the response. The washer acts as a back stop but isn't helpful if the alignment is really bad. The key discovery was that if you look at the white bushes holding the screws, they are eccentric. In other words you can tweak them slightly to adjust such that the belt runs true and doesn't "run-in/run-out". Once corrected, the belt ran fine. I even replaced the speed controller electronics for completeness and Have a wonderful machine. It's still lumpy at low revs, I may get a replacement stronger motor at some point, but for now it's just part of the little fella's character. All the best.
@@ZTTINGS thanks for the info; I know that the adjusting bushes are eccentric but I’ve seen the relevant page in the service manual and the thing it says is to adjust them so that the belt is slightly slack and not tight. Glad you got it working well and aligned correctly. The A901 is lumpy at low speed, it’s a crude design of speed control. The A901E motor is much better and has a proper PCB to regulate the speed.
Hi
Thanks for the video, any suggestions where I can buy good quality repair parts ? I have seen many in eBay.
Thanks
I use eBay shops - about three. I only use the later specification component listings, not new/old stock that some vendors offer.
Hi there, I have the A901. It runs but there is a bit of a wiff of burning so I intend to replace the components as stated here however it id VERY noisy. I have tested the machine with the drive belt removed so the noise is for sure coming from the motor assembly. Any ideas before I buy a new motor? Many thanks
Hi David. The 901 was never a really quiet machine, but you could check the motor bearings and brushes. There's a good video on TH-cam explaining the bearing check. Good luck.
Thanks for getting back to me. It isn't just motor noise it sounds like a bag of bolts! I will give the bearings an oil and see if it helps. I suspect it may be time for a new motor though.
David Kemble Don't condemn the motor just yet, a little end float is needed. Check the fan is intact too and the brushes are OK.
Hello, I have the same model machine and i have followed your instructions to replace both capacitors and resistors as well as the triac. the machine run just fine when i tested it. While i was placing the cover, tighting the screws, etc, i accidently pressed the green bottom. since then the machine does not run. can you please assist me?
The green button is a re-setable (in theory) overload button. If it was working, maybe check the connections and give it another press. Maybe check the button for continuity before condemning it.
Hello again. I have had my A901 repaired - I ended up taking it to a shop and getting it done as I didn't have the means, skill or time to do it. It turns out that one of the transistors had gone and it is now working again. So I have this machine alongside my KM300. I was wondering if you could answer a further question for me. Would I be right in thinking that over the years, the speeds at which the different model Chefs run has changed? I notice that the A901 runs noticeably faster on setting 1 than the KM300 does at the same setting.
If it's an A901 (not A901E) the minimum speed should be set to ~60 r.p.m. You can use a stopwatch and time how many times the planet hub goes round in one minute to check it. Later models (A901E, KM200 and early KM300) have a different speed control circuit which uses feedback from a magnet on the bottom of the motor fan to induce a voltage in a pickup coil; these can be set to around 45 r.p.m. at mimimum speed (sometimes slower). The later KM300s have a motor of Chinese manufacture and it's possible that these run even slower at minimum speed. When you raise the top arm of the mixer, if you look at the black pastic motor cover and ventilation slots are visible it has a British motor. If the cover is "solid" (no ventilation slots at the front) it has a Chinese motor.
Does it matter which side is up on the capacitors?
These capacitors have no polarity markings (from memory). Worthing checking the ones you have, so it shouldn't matter what way they go round. On the kits I've used, I have the writing facing me so I know what type they are. Note, both capacitors are different values.
I got one for just under £100 and I was using it this afternoon, it was fine for the first 5min but suddenly I can smell something and I saw smoke coming out with really bad smelling gas can anyone help me😢
Thank youuu
Please advise a link from which it can be learned how to dismantle motor from A901
This guy has done a very good video: th-cam.com/video/gVAFNt6LH6o/w-d-xo.html
Hello, am hoping you can clarify something for me. I have this exact machine that belonged to my mother and recently retrieved it from my loft loft. When I plugged it in and turned it on it seemed to work just fine, which was encouraging, so I decided to use it. Initially it was fine as it was just mixing some flour and other dry ingredients. I attached the dough hook and added water to the flour (was making bread) so now the machine was operating under a much greater load. Within about 10 seconds smoke started pouring out of the machine although it continued to turn the hook. I immediately switched it off. Would this be the same issue as you are outlining in this video? The reason I ask is because you seem to be implying that the issue you are demonstrating here would result in the machine stopping altogether. I am very keen to repair this machine because it is in such good condition and if I can save it I will. Before I start buying replacement parts I need to be sure that the issue I have is the same as the one you are describing in your video. Thank you.
The symptoms your machine showed would be in-line with one or both of the capacitors failing. Without inspecting the machine, it would be impossible to confirm that. The one in the video failed as both capacitors had expanded with a resistor also going open circuit, causing it not to run. I've also repaired Chefs that carry on working with the rest of the circuit intact but performing badly (motor speed flutter). The best way to confirm your problem is to disconnect from the mains (of course) and inspect all components with a meter. If the components are original (say 35 years plus years old) then the capacitors are probably past their best anyway and would require replacement. While the machine is in pieces, check the motor brush operation and belt tension. You might also want to clean inside the machine too. Good luck.
FixItWorkshop Worthing thanks for the speedy and informative reply. Will let you know how it goes.
Looks like the same components as my km250, except for it’s dead bug construction as opposed to the KM’s PCB circuitry.
Not much use this - tells you what you need to do but not how to do it
Very sorry about that.