HP QMS 1660 - Manual (Page 163)

Replacing the
Printer and
Controller
Board Covers
6-25 Printer Options
Procedure
1 Replace the controller board cover.
a Place the metal cover on the controller board.
b Replace the 15 screws you removed earlier.
2 Hold the printer's plastic cover over the top of the printer and
slide the connector cable back into the printer's connector.
Connector Cable