The service manuel is very helpful, we where able to restore the device to its working operation again.
Text excerpt from page 15 (click to view)
Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. 1.1 1.0 Date 2001.07 1995.08 Description of Revision Addition of Ref No. 18 FLEXIBLE BOARD New