HP LASERJET 3600 - Manual (Page 9)

13. The slide lever and cartridge locks should look like the picture below when all is in place.
14. Lock the white slide lever in place by installing the metal case and white plastic piece. Make
sure to insert the flange of the sheet metal in the slot on the sheet metal, and place the white
shaft in the while slide lever. Reconnect the white arm to put tension on the white slide lever.