Are you sure
you're quoting the right numbers here? The numbers
that matter are the ones stamped in black on the connector
housings. I my Sirius (twin floppy model), the connectors are :
I have no black numbers printed on the connectors - only the MX- numbers
(which are moulded), and another number (starts with a 4) which is the same
on all the connectors.
Oh dear. You've got wome wiring to trace...
I'll have another look tomorrow (er, today I mean), but I'm 99% sure there's
nothing on them.
(list of stuff cut, ta)
Hmm, I may have to take the drive carrier out again to see if I've got one
of the wires tangled. From what you're saying, one of the coloured batch
belongs on B21 (J8); and it'll be a real stretch to make it reach at the
moment.
Yes. The connector numbering is actually the same as the connectors in a
Tandon TM100, and number 21 is the psindle motor. It'll be 4 coloured
wires (2 of the motor, 2 for the tacho) that go to that component.
Now, from your list, J13 (B12) (5-pin connection printed on the circuit
board) should have connector 12 in it - which has only 4 pins.... Is the
unconnected pin on the LH or RH end?
I don't know, but I explained it last night. Sirius used several
different drive mechanisms in these machines, or at least had the
capability to do so. The stepper motor is either 4 windings with a common
connection (5 wires) or 2 separate windings (4 wires). The board can
handle either (unlike, BTW, the Commodore 8050 which is of course
somwhat similar, in that unit, there are 2 different 'analogue boards'
for the 2 types of stepper motor). Anyway. one end pin on the PCB-mounted
plug is linked to the +12V rail. That's the one you _don't use_ if you
have a 4-wire motor.
because
it's the only 3-pin connector. The others, however, are a
mystery without my original reference...
I'd trace the wiring to the various bits on the chassis and plug
in as above.
I'll certainly try... But I'm not willing to re-power it until I've sorted
the power plugs...
Err, can't you just trace the grounds, +5V, etch on the connectors to see
what would make sense?
-tony