Canon MD350 floppy drive info needed

[bob385]

I have a piece of equipment with a defective Canon MD350 3 1/2" floppy
drive. I need some information on interpreting the jumper settings to help
in my search for a replacement drive. The jumper plugs are marked and
jumpered as shown below.

A S S S S S
H H 3 2 1 0
o o o--o o o
| |
o o o o o o

thanks in advance, Bob

 

[Robert Baer]

bob385 wrote:

I have a piece of equipment with a defective Canon MD350 3 1/2" floppy
drive. I need some information on interpreting the jumper settings to help
in my search for a replacement drive. The jumper plugs are marked and
jumpered as shown below.

A S S S S S
H H 3 2 1 0
o o o--o o o
| |
o o o o o o

thanks in advance, Bob

1) I have modified the drawing slightly to conform with expected layout
(courier or other mono-spacing font).
2) Most drives have places for jumpers labelled like: DS0, DS1, DS2 (and
optionally DS3); it is DS1 that must always be jumpered (reasons are
wierdness from IBM "techs" not knowing how to count from zero, and
desire to have everything the same - hence that and the partial "twist"
in the FDC cable).
Some drives may have "equivalent" labelling like: D0, D1, D2, D3.
3) There may be other jumper positions nearby and/or in other areas, and
as long as *nobody* has fiddled with them, all jumpers will be in the
correct places.
4) The given pattern above: S0, S1, S2, S3 appears to be a variant of
D0, D1, D2, D3 - BUT if that dashed line is a junper, it is in the wrong
place, and should be:

A S S S S S
H H 3 2 1 0
o o o o o o
|
o o o o o o

5) Nearby and close(r) to the connector for the floppy controller cable,
one should find a resistor pack; in older drives may be a Single Inline
Package (SIP) usually 9 pins if SIP - this is for logic line pullups.
Modern drives may use discrete surface mount resistors for that function
and be scattered on the PCB and so unrecognizable as to function.