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drives:nec_fd1157c [2022/02/11 14:35] – Created from various sources found on the web. Links included. flandrives:nec_fd1157c [2022/02/12 10:54] (current) – [Basic Disassembly] Added warning and wordsmithing. flan
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 These drives are compatible with a standard Floppy interface. These drives are compatible with a standard Floppy interface.
  
-Specifications:+===== Specifications ====
  
 ^ Capacity       | Formatted: HD 1.2 MiB; DD 700 KiB    | ^ Capacity       | Formatted: HD 1.2 MiB; DD 700 KiB    |
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 (Specifications come from {{nec_fd1157c_datasheet.pdf|an online datasheet downloaded from NEC on 2014-08-28}}.) (Specifications come from {{nec_fd1157c_datasheet.pdf|an online datasheet downloaded from NEC on 2014-08-28}}.)
  
-Jumper settings from http://jope.fi/drives/necflopp.txt:+==== Jumper Settings ==== 
 + 
 +From http://jope.fi/drives/necflopp.txt:
  
 ^ Configuration 1: Non-twisted cable |||||||||| ^ Configuration 1: Non-twisted cable ||||||||||
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 note: Drive 2 and controller are on one the same side of the twist, and drive 1 is on the other side. Both drive 1 (A:) and drive 2 (B:) have DX=1. note: Drive 2 and controller are on one the same side of the twist, and drive 1 is on the other side. Both drive 1 (A:) and drive 2 (B:) have DX=1.
 +
 +=== Jumper setting options ===
 +
 +(* is the default setting.)
 +
 +^ Head Load Condition      ^  HS  ^  USE  |
 +| Drive select & head load |  1   |   1   |
 +| Drive select             |  1   |   2   |
 +| Head load                |  2   |   1   |
 +| Drive select & motor on  |  1   |   3   |
 +| Motor on                 |  2   |   3*  |
 +
 +^ Motor On Condition ^  MON  |
 +| Drive select       |   3   |
 +| Head load          |   2   |
 +| Motor on           |   1*  |
 +
 +^ Display Lamp Condition   ^  IUS  ^  USC  ^    LED    |
 +| Head load                |   2   |   1   |  1 and 4  |
 +| Head load & Drive select |   2   |   1   |  1 and 5  |
 +| Drive select             |       |   -   |  2 and 4  |
 +| Ready                    |       |   -   |  3 and 4  |
 +| Ready & Drive select     |       |   -   |  3 and 5  |
 +| Drive select             |       |   -   |  2 and 5  |
 +| Head load                |   1   |   -   |  1 and 4  |
 +| Head load & Drive select |   1   |   -   |  1 and 5*  |
 +
 +Note: "-" indicates that the jumper position doesn't matter.
 +
 +^ Density Switching ^|||
 +^ Record density ^ High/Normal density signal ^  DEN  |
 +| High           | H level                    |   1*  |
 +| Normal         | L level                    | :::   |
 +||||
 +| Normal         | H level                    |   2   |
 +| High           | L level                    | :::   |
 +||||
 +| High           | H level                    |   3   |
 +| High           | L level                    | :::   |
 +||||
 +| High           | H level                    |   Open  |
 +| Normal         | L level                    | :::     |
 +
 +^ Rotation Change ||
 +^ Rotation in normal density mode ^  HDE   |
 +| 360 rpm ("single speed mode")   |   1*   |
 +| 300 rpm ("dual speed mode")     |   2    |
 +
 +Note: A rotation in a high-density mode is 360 rpm for both short plug and "HED"=1 and 2.[sic]
 +
 +^ Disk Change/Ready ||
 +^ Disk change/ready signal output condition ^  DCG  |
 +| Ready signal                              |   1   |
 +| Disk change signal                        |   2*  |
 +
 +==== Basic Disassembly ====
 +
 +⚠️ **Use a J1 screwdriver or you will strip the screws!** Screws on this drive are type J1 JIS screws. [[https://chapmanmfg.com/blogs/news/phillips-bits-vs-jis-bits-whats-the-difference|These are similar to Phillips screws, but not the same.]] 
 +
 +With the drive flat on a table, with door facing you, remove the screw on the right about midway down the chassis. This screw holds the RF shielding on. With the screw out, the shielding should slide forward towards the drive door. Lift the back up. You should be able to remove the shielding entirely. Reverse the process to put it back.
 +
 +==== Extras ====
  
 Cleaning video: {{youtube>kCBLJMqTFng?medium}} Cleaning video: {{youtube>kCBLJMqTFng?medium}}