Question about Gem Sound CDM-150 Mixer

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Tray doesn't open!

At times, my tray doesn't open! I'll turn it off and simply use a back up mixer at a gig, however the next day, lo and behold, now the tray will open! why is this happening?

D.J. Play (Marilisa)

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Sometimes the electronic device thats programed to open the door malfunctions from wear and tear or its just defected from the manufacture, if you have warranty send it to Gemsound so they can replace the defected peace.


Posted on Oct 23, 2008


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Well first thing; here is the link to the KitchenAid site where your parts list can be found.

Next, the parts list will tell you what the part number is for the brushes and all the parts that make up the brush assembly. If you need to replace any part other than the brushes you will need to do a full tear down to do that. Also; remember that there are four different ways to replace the brushes but only one way will work. You need to be very careful to remember which way the old brushes come out, there is a beveled edge on one side of the brushes and the new brushes need to go back the exact same way or they will not reach the commutator on the armature and the mixer will not work until the brushes make that contact with the armature.
Lastly the reason that your mixer gets out of time is that over time, 8-10 years of use, the nuts on the speed control switch that hold the three timing screws in place simply get loose due to vibration and the screws can rotate in or out. Some times the screws vibrate loose and the mixer just will not turn on next time the mixer is used. Peeps then think it's broke and will not work so they sell it for parts and by a new mixer. When the only thing they need to fix it is a Phillips screwdriver , a small 3/8th open box wrench and about 20 minutes time to fix it.
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6 If your machine is older then 1978 then it may be the IR filter inside the mixer (hard to find )
7 the carbon brushes that are located on the side of the mixer may have finally worn down (cheap fix) but there are four ways to put the new brushes into the machine and only one way works. You have to be careful with the beveled edge of the new brush and which way it fits back into the housing.
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The easy one is the stuck lever. Open the mixer up and see what is going on.

The other requires more effort. Again, opening things up is the first step. This time, however, simply removing the back cover should do. The most likely solution has to do with adjusting the control plate screws and the other may be replacing the phase board. See the Service Manual which can be downloaded at:

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You don’t say if you have a ‘tilt-head’ or a ‘bowl-lift' mixer, but you can easily download a PDF version of your Owners Manual from the KA website at: (
Click on Customer Care>Locate Manuals& Guides> and enter the 6 character model number (in your case, use KSM5PS)and select the last file listed that appear under Owners Manuals: KSM5PSWW0.pdf (2930.74 KB) and save that file to your PC. You’ll need to have Adobe Reader to be able to open it. Turn to Page 11 and you will find the instructions for adjusting the mixer head height. I have extracted the instructions below:
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Tilt-Head models
• Unplug mixer.
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If you over adjust the screw, the bowl lock lever may not lock into place.

Bowl-Lift models
• Unplug mixer.
• Place bowl lift handle in down position.
• Turn screw (B) SLIGHTLY counter clockwise (left) to raise flat beater and clockwise (right) to lower flat beater.
•Make adjustments with flat beater, so it just clears surface of bowl.

If you find the adjustment screw missing, you’ll need to replace it. But now you’ll need
I hope this helps! –Howard, Burke, VA
If this solution has helped you, please rate it, thanks! - hslincoln

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