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--- 5_25_floppy_drives:teac_fd_55br [2022/01/15 12:21] – created js
+++ 5_25_floppy_drives:teac_fd_55br [2022/01/15 12:28] (current) – js
@@ Line 20: / Line 20: @@
 ====== TEAC FD-55BR ======
 The FD-55BR is a 5.25" double 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 either done with a solenoid .
+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 double density and only read at single density.
@@ Line 30: / Line 30: @@
 The 101-U variant has a Black front bezel.
-It uses the [[#c|13332115-00C]] control board and the Kumagaya 771V4-3101B motor board.
+It uses the [[#c|13332115-00C]] control board and the Sankyo SB27D motor board.
 === Pictures ===
 | {{:5_25_floppy_drives:teac_fd_55br:back.jpg?200 |}} | {{:5_25_floppy_drives:teac_fd_55br:top.jpg?200 |}} | {{:5_25_floppy_drives:teac_fd_55br:bottom.jpg?200 |}} |
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 {{pdfjs 100%,800px>:5_25_floppy_drives:teac_fd_55br:13332115-00c.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.