Panasonic SA-BTT775GA Service Manual page 79

Step 6 Align the damper on Traverse Deck with the slot of the
chassis of BD Mechanism Unit (BRS1P) as shown.
Caution: During assembling, ensure the Traverse Deck do
not hit to the Slide Cam.
Step 7 Insert the Screwdriver and push inwards.
Caution: During assembling, ensure the BD Traverse
inserted fully.
Step 8 Push the Slide Cam sidewards.
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