Read Panasonic KX-MB773RU / KX-MB773UA (serv.man8) Service Manual online
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KX-MB773RU/UA
12.3.9. ADF (Auto Document Feeder) SECTION
12.3.9.1. NO DOCUMENT FEED,DOCUMENT JAM and MULTIPLE DOCUMENT FEED.
CROSS REFERENCE:
SENSOR SECTION (P.154)