The Sony AV-3600 service manual was what I needed for the repair of this unit
Thanks for the good service
Dave
Text excerpt from page 38 (click to view)
CDX-GT121/GT220/GT222
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 Date 2007. 08 New Description of Revision