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Documentation for Alps DFL413C02B

maxtherabbit

Veteran Member
Joined
Apr 23, 2019
Messages
1,898
Location
VA, USA
I'm looking for schematics or technical documentation of any kind for the Alps DFL413C02B 720k HH 3.5" floppy drive. This drive was used in the External diskette drive part 4865 as well as the 5140 convertible and also I believe the PS/2 model 30, possibly late ATs as well.

Thanks in advance
 

cantankerousFox

Experienced Member
Joined
Apr 9, 2018
Messages
59
Location
Pennsylvania
What kind of info are you looking for? I know there's info for converting the pinouts to 34pin but thats about all I've seen. The Alps are pretty reliable but when they fail they are pretty much dead as I have come to understand.
 

maxtherabbit

Veteran Member
Joined
Apr 23, 2019
Messages
1,898
Location
VA, USA
I've got one that will spin the motor and I can step the head in and out with an exerciser, but the activity LED never turns on and I never get an index pulse. Sure seems like a bad logic board so I was hoping to troubleshoot it
 

cantankerousFox

Experienced Member
Joined
Apr 9, 2018
Messages
59
Location
Pennsylvania
I skimmed thru my 1540 Service Guide and it appears they treat this as an FRU or atleast don't dive into detail. Probably because there were two manufacturers of the drive, Alps being the more reliable from what I have seen.
 
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