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Old 10-21-2015, 07:15 PM
  #10  
Mdegenhart
Senior Member
 
Join Date: Jul 2013
Location: Dallas, TX
Posts: 669
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It's the knob on top. Here's a link to a downloadable manual for your machine:

http://www.manualslib.com/manual/790...t-4900-Qc.html
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