The Fresh Loaf

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Bosch Compact repair help

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alex9179's picture
alex9179

Bosch Compact repair help

Hello!  

I'm a new member, although I scoured this site previously when looking for advice about mixers.  I ended up getting the Ankarsrum but found something for my mom, a Compact from Craigslist that was in "perfect" condition.  Later realized that the gear had been stripped.  I replaced that part, but now I can't get the darn thing to turn back on!  

I've tried to post this question on the Mixer Owners yahoo group, but it won't let me type any text except for a title.  Yahoo is frustrating.

Anyone with an idea of what I can try to get this thing to operate?  I'm going to see my mom in a couple of weeks and would love to have it working for her.

 

Thank you for any help!

Bob Marley's picture
Bob Marley

Does it have a circuit breaker that might need resetting??  Did the mixer turn on when you first got it??

alex9179's picture
alex9179

Hmmm, I don't know.  I'm a novice at repair.  Do you know where to look?

It did work when I got it.  I discovered the stripped gear after using it a few times.  I'm afraid I'm the cause of this.  We don't have any brick and mortar repair places for small appliances.  I'm calling the one in town for another issue tomorrow, but I'd like to fix it myself...if I can.

Bob Marley's picture
Bob Marley

Are you stating that you yourself stripped the gear??  Did the mechanism stall at the time as this could have caused the motor to overheat and cause an electrical short.

barryvabeach's picture
barryvabeach

Alex, a little trouble shooting might help. If it makes no noise whatever when you turn it on, you need to work your way out from the wall socket to confirm you have power.  If you have a tester, plug that in the socket, if you don't have a tester, test with another appliance.  The next thing to check is the cord itself, if you have one of these, you can hold it against the cord when it is plugged in and it will beep if there is power in the cord.  http://www.homedepot.com/p/Commercial-Electric-Non-Contact-AC-Voltage-Detector-MS8907/204288388

If you have power to the cord,  you need a Volt Ohm Meter, and you need to unplug it, to check to see if there is problems with the wiring to the switch, or the brushes.  Usually, if there is an electric problem, it is fairly easy to fix once you find it.  If you overheated the motor, I think you would have sensed that.  Many AC motors have a thermal fuse that automatically resets when they cool down, but some have to be replaced,  but if you have a Volt Ohm Meter, you can always test the fuse once you unplug the Compact and open it up. 

 

alex9179's picture
alex9179

I can say that it was working with the stripped gear.  On the 2nd or 3rd loaf of bread the planetary motion would stop with a loud BRBRBRBRBRB noise, like it caught on something.  I tried whisking and it didn't make that sound.  The movement was fine. 

When I opened it up to check the gear, I could see two areas that had been worn down.  Ordered the part, replaced it, put the cover back on and now it won't come alive.  I'm pretty sure that I didn't overheat anything since my test whisk was A-OK.

I know the outlet is fine, as I've used other appliances there.  I don't have that voltage detector but I do have a volt ohm meter. 

I'm looking at the specs for the mixer and can't find where the fuse is.

plevee's picture
plevee

Have you tried the Bosch customer support phone number-800 944 2904?

alex9179's picture
alex9179

I was thinking of taking it to a Bosch tool repair place tomorrow.  I'll contact the support people first and see where that gets me.  I just wish I knew what I did to it!

barryvabeach's picture
barryvabeach

A VOM is what you want. All of the following should be done with the Compact unplugged. Put one probe from the VOM on one side of the plug, the other lead on the other end of the plug, and set the VOM to ohms  ( or even better - continuity - on continuity, it should beep when you place the one lead on the other, so you don't have to even watch the meter.  If you don't have continuity, put in on Ohms, and touch one lead to the other and confirm it reads 0 ohms. )  With one test lead on one prong of the plug, and the other lead on the other prong, the reading should be infinity,  Turn the Compact on ( still unplugged ) it should still read infinity ( actually it would read 0 or low ohms if it was working, but it isn't - and now we are going to find out why).  Now take apart the Compact, and put one of the test probes to the first wire you see coming in from the power cord. If that does not read 0 ohms,  move the other test probe to the other prong on the plug, and check again -  at this point you should have 0 ohms,  now it is just a matter of tracing continuity through the rest of the machine -  for example, at the side of the switch closest to the power cord, you should get 0, then  move the test probe to the other side of the switch, and turn the switch on and off, and you should see the continuity go from infinity to 0, then keep tracing the wires -  at some point you will find something loose - like a wire to a brush or a switch, or you will find a thermal fuse has shorted out.  

alex9179's picture
alex9179

Everything gave me a 0 until I came to a blue wire that connects the computer board to a copper coil.  This read infinity on either prong, on all power levels, but I got a 0 reading when I touched the place where it's soldered to the board and the connection at the copper.  The connections are snug.  I still can't tell where a fuse would be, to check that. 

alex9179's picture
alex9179

Oh well.  I'm packing it in and hope to get to someone who can fix it tomorrow.  Thanks for the assistance, though.  I learned some new things today!