Bosch Ergomixx MSM11000 Circuit Board Replacement

Step 1 Circuit Board




• Carefully remove the plastic half ring with a soft plastic lever. Below are 2 Torx screws.
• The third screw is under the power button. This one can also leverage carefully.
Translate
Add a comment
Add a comment
Add Comment
1024
Cancel Post comment
Step 2



• If the screws are out, you can pry the housing carefully. For this, it must be attached to the 4 marked points with a narrow screwdriver or plastic lever. The places are measured at 5 and 10 cm from the left.
Translate
Add a comment
Add a comment
Add Comment
1024
Cancel Post comment
Step 3
• Here you can see the circuit board. The white side with the two copper pushbuttons and the starting capacitor. The green side with the traces.
• The reason for the defect can be seen clearly on the conductor side. The conductive paths are burned away in two places.
• Nuts were ground with the blender. It was overloaded and became hot. Normally, a thermal fuse should be installed here to protect the device and the user. Unfortunately, no fuse was installed here, but a conductor path was made thinner (green circle).
• A thermal fuse could have been changed, the melted away trace can of course not be bridged as you will never find the right wire gauge. During burnout, copper vapor was also burned into the circuit board and the protective lacquer. This can lead to crippling currents. The board is therefore scrap.
• In addition, another conductor path was burned at a second location (red circle). This means that the fuse has tripped too late.
• A predecessor model still had a thermal fuse that could simply be unsoldered. On the circuit board is also still the hole for this, but it was bridged with a metal bracket.
Translate
Add a comment
Add a comment
Add Comment
1024
Cancel Post comment
Step 4
• Here is the simple circuit diagram. At the red place the fuse. The 330K resistor for discharging the C1 capacitor. The two switches for normal operation (half wave via the diode) or whole wave without diode. After that the 4 diodes as rectifiers for the 230V DC motor.
Translate
Add a comment
Add a comment
Add Comment
1024
Cancel Post comment

Special thanks to these translators:

de en

100%

vet121

shingle

BenZ78

These translators are helping us fix the world! Want to contribute?
Start translating ›

Author

with 2 other contributors

Andreas Reheis

Member since: 03/19/17

2,038 Reputation

16 Guides authored

Badges: 15

• 
• 
• 

+12 more badges

Team

erfindergarden foundation Member of erfindergarden foundation

Community

5 Members

40 Guides authored

Embed this guide

Choose a size and copy the code below to embed this guide as a small widget on your site / forum.

Preview