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<WRAP tablewidth column 30% right>
{{METATOC}}
~~NOTOC~~ \\
^ Manufacturer    | TEAC |
^ Model    | FD-55F |
^ Density    | <abbr>Quad Density (QD/4D)</abbr>, <abbr>Double Density (DD/2D)</abbr>, <abbr>Single Density (SD/1D)</abbr>((Read-only))  |
^ Sides    | <abbr>Double Sided (DS/2S)</abbr>, <abbr>Single Sided (SS/1S)</abbr> |
^ Rotation speed | 300 |
^ Maximum seekable tracks   | 84 |
^ Interface | Shugart \\ (PC-AT compatible) |
^ Data Connnector | 34 position card edge |
^ Power Connnector | 4 pin Molex |
^ Head movement | Metal belt |
^ Head loading | Solenoid |
^ Disk locking | Lever |
^ Known colors |<WRAP>
| <colorswatch #121114: > | Black |
</WRAP>|
</WRAP>
====== TEAC FD-55F ======
The FD-55F is a 5.25" quad sided double density floppy drive made by TEAC. It is part of their FD-55 series and was introduced in the beginning of the 1990s.
There are multiple variants that are listed below. All variants use metal belts to facilitate head movement and lock the disk with a lever. Head loading is done with a solenoid.
The drive can read and write at quad density and double density and only read at single density.

===== Variants =====
The FD-55F model has a number of variants the differ in color, head loading type, circuit boards and more. They can be identified via the label that is located on the back of the drive (connector side).

==== FD-55F 3-U ====
=== Description ===
The 3-U variant has a Black front bezel.

It uses the [[#k|15532001-03K]] control board and the Sankyo SB27D motor board.
=== Pictures ===
| {{:5_25_floppy_drives:teac_fd_55f:back.jpg?200 |}} | {{:5_25_floppy_drives:teac_fd_55f:top.jpg?200 |}} | {{:5_25_floppy_drives:teac_fd_55f:bottom.jpg?200 |}} |
| {{:5_25_floppy_drives:teac_fd_55f:front.jpg?200 |}} | ::: | ::: |

===== Jumper settings =====
==== 15532001-03K ====
{{ :5_25_floppy_drives:teac_fd_55f:15532001-03k.pdf |}}
++++View PDF|
{{pdfjs 100%,800px>:5_25_floppy_drives:teac_fd_55f:15532001-03k.pdf?page-width}}
++++
===== Common issues =====
==== Track Zero Misalignment ====
When removing or swapping the control board the Track Zero alignment is lost and has to be realigned.
The Track Zero alignment is adjusted by loosening the control board screws and sliding it forward or backward.
If the board is to far back the head assembly will never reach the sensor and will hit the back end of travel.
In this case the floppy controller might try to reach zero multiple times, causing a fast repeating knocking noise.

The Track Zero alignment can be performed by following these steps:
  - Loosen the control board screws so that it can slide back and forth with some resistance.
  - Slide the control board all the way backward (towards the connectors).
  - Repeat until Track Zero alignment is correct:
    - Move the control board forward (towards the front bezel) by about 0.25mm.
    - Try to read a disk or use KryoFlux track calibration mode ("dtc -v360 -i4 -c1").
      - If the disk reads fine or KryoFlux shows reading of track 0, then the Track Zero alignment should be OK.
      - If the disk doesn't read or KryoFlux shows no track, then continue.
    - Stop the disk reading or KryoFlux track calibration mode.
  - After reaching a good control board position it is advised to check the alignment multiple times to ensure that it is working all the time.
  - Tighten the control board screws, make sure not to move the board while doing so.