Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this receiver.
Text excerpt from page 4 (click to view)
DAV-DZ555K/DZ556KB/DZ750K
REVISION HISTORY
Clicking the version allows you to jump to the revised page. Also, clicking the version at the top of the revised page allows you to jump to the next revised page. Ver. 1.0 1.1 1.2 Date 2007.03 2007.05 2007.06 New Addition of Korean model for DAV-DZ555K Addition of Thai model for DAV-DZ750K Description of Revision