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Old 20 November 2019, 20:37   #1
DavidQ
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How to modify a Chinon FB354 floppy drive to enable the disk activity LED.

I found this information last year on how to get an Amiga 500 Chinon FB-354 floppy drive with a functioning disk activity LED working in my Amiga 1000 and produced this set of instructions on how to do it. Although I have posted it elsewhere I thought folks here might find it helpful too (do this at your own risk).

Steps to follow...

1) Solder a 2200 ohm (2K2) surface mounted (SMD) resistor to the Chinon FB-354 floppy drive motherboard at location R13 to enable power for the disk activity LED locations A & K on the front of the motherboard.

2) Solder an LED to locations A & K being careful to attach the LED anode to location A and the cathode to location K.

I have uploaded a diagram (JPEG) with this post showing the relevant locations.

Credits for original mod information.

Jan Beta's YouTube video...
"Amiga Internal Disk Drive in External A1010 Case".
(The video contains Chinon FB-354 LED activity resistor mod info at 10 Minutes 40 Seconds in).
[ Show youtube player ]

Jan refers to the mod information originating from...

Stephan Ricken at the brotkastenblog.
https://brotkasten.blog
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Old 20 November 2019, 21:37   #2
deimos
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I wish I'd known that 30 odd years ago when I ended up with a 500 drive in my 1000 after Commodore couldn't get the original to read past disk 2 of Dragon's Lair.
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Old 20 November 2019, 22:45   #3
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Well, I know everything comes to he who waits but 30+ years might break a record of some sort.
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Old 06 April 2022, 01:51   #4
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Even in 2022 this information still made my day, as I finally got that silly LED to work. Thanks a million.
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Old 06 April 2022, 01:59   #5
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Glad it helped.
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Old 06 April 2022, 07:37   #6
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There are a few variants of the drive, but the footprint for the resistor is always found roughly around the same place. You can use your multi meter to trace it from the LED backwards, if your drive is different to the illustration.
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Old 06 April 2022, 15:35   #7
DavidQ
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That's interesting information, thanks Jope. It would be good to have photos of the variants posted here. I'll do so if I ever see any of them.
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Old 06 April 2022, 16:11   #8
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My drive looked exactly like the one in the photograph.
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Old 16 April 2022, 13:02   #9
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Different Board Layout

Hello everyone,

Now I encountered Chinon drive with a different board layout. It does have R13 in place, but that seems to have another purpose. I checked the connections to the LED (which so far does not work), and "K" is connected to ground, whereas "A" routes to R19 (which is not populated). I added a 2,2 kOhm resistor, but that did not help. Any suggestions?

Cheers,
Jens
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Old 16 April 2022, 13:07   #10
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I just realized I uploaded the wrong picture in my previous message. I thought both drives with the different layouts were similar, but curiously the one in the picture has R19 populated. Here is the one with R19 empty. On neither of the two boards, just adding an LED worked.

Cheers,
Jens
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Old 16 April 2022, 15:43   #11
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Trace the signal backwards from the LED, perhaps it's a missing transistor on this board or the location number for the resistor is different.
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Old 01 October 2022, 05:20   #12
madmungo
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I have this same drive. When tracing out the LED cct I found R19 & Q1 missing. Anyone know what transistor to put there?
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Old 04 October 2022, 12:55   #13
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Would it be possible to do the same with a Chinon fz-354 (the usual floppy drive inside A600/A1200)?
If so, could someone give the step by step instructions to achieve that?

UPDATE:
I've just opened an specific thread for it

Last edited by jurassicman; 05 October 2022 at 20:51.
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