Brother GT-782 Instruction Manual page 104

7. Troubleshooting
(18) Turn the lever to the direction of the arrow to lock the Print Head.
(19) Remove the Nozzle Protection Seal by pulling it up.
Nozzle Protection Seal
(20) Take off the gloves, insert the flat cable into the connector, and then turn down the connector tab to lock the cable.
<Note>
Make sure the flat cable is inserted straight against the connector. If not, reconnect it correctly.
The flat cable is very fragile. Be careful with handling it.
95
Open when Connecting Tab is parallel to FFC
GT-782
Close when Connector Tab is vertical to FFC