HP DAT40 (DDS4) drive







Capstan subunit

This subunit contains two motors that drive the reels inside the cartridge.




Disassembly

The drive must be disassembled (as described on the main page) first.
After the main metal mounting plate with the drum subunit was removed, you should now see the capstan subunit in the plastic chassis of the drive. There is still a lever above it:
Lever above capstan subunit
(Click to enlarge)

Remove the lever (leave the spring in place):
Levers disassembled
(Click to enlarge)

Now the capstan subunit is ready for disassembly:
Capstan subunit
(Click to enlarge)

There is a nut on top and a spring below the metal plate:
Nut
(Click to enlarge)

With this nut the azimuth (angle) of the capstan shaft against the tape can be adjusted.
A slotted screwdriver can be used from the top.

To remove the capstan subunit the nut must be removed first.
Thread bolt after nut was removed:
Nut removed
(Click to enlarge)

Now remove the two screws and pull out the capstan subunit.
The motor looks like this:
Capstan motor
(Click to enlarge)

If you look at the chassis, you see two points where the capstan subunit touching (and can be tilted over):
Chassis view
(Click to enlarge)

Chassis view zoom
(Click to enlarge)

To disassemble the thread bolt, remove two screws on the bottom of the chassis:
Thread_bolt assembly
(Click to enlarge)

Thread bolt with spring and nut
(Click to enlarge)

Reassembly

After reassembly of the capstan subunit, install the lever again:
Lever reassembled
(Click to enlarge)




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