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drives:nec_fd1157c [2022/02/11 14:43] – Added section headers; added Basic Disassembly section flandrives:nec_fd1157c [2022/02/12 10:48] – [Jumper Settings] Added explanations for all of the jumper settings flan
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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 ==== ==== Basic Disassembly ====