View source for NEC FD1155D 5.25" floppy drive

{{DeviceAlerts}}
{{InfoboxDevice
|Title = NEC FD1155D
|Picture = 
|Release Year = 198X
|Mounting Technology = Through Hole, SMD
|Capacitor Types = Aluminum Electrolytic, Ceramic
|Leak Risk = Low
|Batteries = None
|Destructive Entry = No
}}
For more information, see this page: https://radioc.web.fc2.com/column/pc98bas/fd1155.htm

== Known Issues ==

===Read/write errors===
====Causes====
*Dirty heads
*Misaligned heads
*Missing head shield (see below)
*Bad capacitors
====Solutions====
*Clean drive
*Replace capacitors

=== Missing head shield ===
[[File:PXL 20250611 114650592 nometa.jpg|alt=Photo of the upper read/write head with the metal shield missing|thumb|Missing upper head shield]]
There is a metal shield that covers the upper read/write head. It is often missing as the adhesive deteriorates.

It is not required for operation, although it does add some weight to the head that is sometimes required. It can be replaced with something like a 5g or 10g washer.

== Disassembly Notes ==
Comes apart easily with a few screws, although note that they are JIS standard heads, not Philips! 

The PCB can be safely removed, it doesn't need aligning. 

== Original Parts ==
=== Controller PCB ===
[[File:PXL 20250611 125639804 nometa.jpg|alt=Overview of the PCB|thumb|Overview of the PCB]]
''Labelled G9ZKP.''
{| class="wikitable sortable"
|+Capacitor [[Capacitor Specifications|Specifications]] and  [[Part Footprints|Footprint]] Information
!RefDes
!Qty
!Capacitance
!Voltage
![https://caps.wiki/wiki/Part_Footprints Mount]
!Diameter/Size
!Height
!Lead Spacing
!Temp
![https://caps.wiki/wiki/Capacitor_Types Type]
!Brand
!Series
|-
|C1, C3, C35
|3
|47 µF
|16V
|TH
|6mm
|6mm
|2.54mm
|
|Electrolytic
|
|
|-
|C2, C4
|2
|33 µF
|25V
|TH
|6mm
|6mm
|2.54mm
|
|Electrolytic
|
|
|}
{| class="wikitable"
|+Active Components
!RefDes
!Qty
!Part Number/Model Number
!Package
!Manufacturer (If Applicable)
!Explanation
!Datasheet
|-
|U4
|1
|7438PC
|DIP-14
|
|Quad 2-Input Positive-NAND Buffer
|[https://www.ti.com/lit/ds/symlink/sn74ls38.pdf SN7438]
|-
|
|1
|74LS14PC
|DIP-14
|
|
|
|-
|
|1
|D70165G
|
|NEC
|
|
|-
|U2
|1
|JBL1006ASP
|DIP-28
|Motorola
|
|
|-
|
|1
|C1905
|
|NEC
|
|
|}

==Replacement Parts==
===Basic PCB Name===
{| class="wikitable sortable"
|+Capacitors
! RefDes
! Qty
! Compatible Part Number
! Order Links
|-
|
|
|
|[https://www.digikey.com/ Digikey]
|}

{| class="wikitable sortable"
|+Active Components
! RefDes
! Qty
! Compatible Part Number
! Order Links
|-
|U4
|1
|SN7438N
|[https://www.digikey.com/en/products/detail/texas-instruments/SN7438N/555977 DigiKey] [https://www.mouser.com/ProductDetail/Texas-Instruments/SN7438N?qs=JS6RUWRH9DVbYBpSxCot2w%3D%3D Mouser] [https://www.lcsc.com/product-detail/C2861851.html?s_z=n_7438 LCSC]
|-
|
|1
|SN74LS14N
|[https://www.digikey.com/en/products/detail/texas-instruments/SN74LS14N/277289?s=N4IgjCBcoGwJxVAYygMwIYBsDOBTANCAPZQDaIALGGABxwDsIAuoQA4AuUIAyuwE4BLAHYBzEAF9CAWgBMiECkj8ArgWJkQAVmaSQUhNAVQVakpHIQm43XPMh6FADLcwFHUA DigiKey] [https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS14N?qs=sGAEpiMZZMutXGli8Ay4kBELecaPbA6Baz7mo8DTZQo%3D Mouser] [https://www.lcsc.com/product-detail/C73064.html?s_z=n_74LS14 LCSC]
|}


''If parts are not available or different selection is preferred, you can use the values in the [[#Original_Parts|Original Parts]] section to perform a parametric search.''

===Kits===
* Digikey BOM: https://www.digikey.com/

== Related Links ==

* [https://www.youtube.com Videos or other things that might be helpful to check out]

== References ==
<references />

[[Category:WorkNeeded:General]]
[[Category:WorkNeeded:OriginalParts]]
[[Category:WorkNeeded:ReplacementParts]]