I have a Kitchenaid mixer that only runs on high speed. According to the service manual, this is caused by a faulty phase control board. Since I do not think I should have to spend $40 on a really simple PCB I decided to repair it. The schematic is in the service manual, but values and part numbers are not given. Here is what I was able to reverse engineer:
http://www.flickr.com/photos/85807139@N00/6344769414/
Q1 - STA06-600SW
Q2 - Unknown, suspected issue (Updated: ST MIcro DB3TG)
R1 - 120K 5%
R2 - 120K 5%
R3 - 100K 5%
R4 - 560 5%
R5 - 71.5K 1%
R6 - REMOVED FROM CIRCUIT
C1 - UNKNOWN VALUE
C2 - UNKNOWN VALUE
Q2 is what I am looking at to replace, since I already replaced Q1 and nothing changed. Q2 has a symbol I am not familiar with, it looks like a anode-anode dual zener diode, but I was thinking it may actually be a diac.
This kind of looks like a dimmer circuit used for lights, but it works by clipping the phases possibly? I am not very good with AC power circuits, so I need all the help I can get. I prefer my power with no zero crossings
http://www.flickr.com/photos/85807139@N00/6344769414/
Q1 - STA06-600SW
Q2 - Unknown, suspected issue (Updated: ST MIcro DB3TG)
R1 - 120K 5%
R2 - 120K 5%
R3 - 100K 5%
R4 - 560 5%
R5 - 71.5K 1%
R6 - REMOVED FROM CIRCUIT
C1 - UNKNOWN VALUE
C2 - UNKNOWN VALUE
Q2 is what I am looking at to replace, since I already replaced Q1 and nothing changed. Q2 has a symbol I am not familiar with, it looks like a anode-anode dual zener diode, but I was thinking it may actually be a diac.
This kind of looks like a dimmer circuit used for lights, but it works by clipping the phases possibly? I am not very good with AC power circuits, so I need all the help I can get. I prefer my power with no zero crossings
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