HP LASERJET 3600 - Manual (Page 10)

15. Connect the four springs on the white slide lever to each of the individual cartridge locks (start
from the middle ones, it is easier that way). You will need needle-nosed pliers with pointed
tips. The spring on the top is attached; the one on the bottom is not attached. Move the ETB
guide to the up (vertical) position to help with removing and re-installing the Main Drive
Assembly.
16. Make sure the gears are aligned properly before installing the main drive assembly. The four
large gears should be in a approximate line (see picture). The top two large gears have an
oval hole that aligns with a triangle stamped into the sheet metal. The two small gears to the
right (they may fall off when removing the MDA), align with the three large bottom gears.
Notice the two holes on each of the small gears align with the small holes of the large gears.