So I played with my ProFiles tonight.
I have 6-8 units, at last count I believed I had 2-3 working units, with one of those being dodgy.
Well good news is, it seems I have 3 working ProFiles, having become a bit more aware of the ROM chips on these things recently, I noticed that one of my 5MB controllers had the 10MB ROM chip installed.. I have no idea how this occured, but I corrected it and now that 5MB is working!
It seems that I did make a mess of muddling units around when I was first trying to work out what was workign and what wasn’t, but thanks to some sleuthing, I’ve started piecing everything back together by case colours, prototype cases, etc.
My earliest Apple Profile drives are the A9M0005 as opposed to the A9M1005 which is still 5MB. Weirdly, my earliest units SN#’s are in the 123000 mark, both had 115V power supplies that have been switched internally into 230V PSU’s (one jump and and fuse change and voila).
The mission continues tomorrow, now I have the 10MB ROM on the right board, I am eager to see if I can get a 10MB working. I originally purchased the 10MB unit from New Zealand for a hefty price. I also had a brand new service 10MB HDA I got with my original Lisa’s, but due to a lack of known good analogue boards its hard to say if I’ll ever get it going.
My 5MB ProFile that was working hooked up to my display Lisa is dead, I know that the ubnit would eventually come good previously after being left on for 20-30 minutes, its no longer the case. I think the analogue board under the drive is the next port of call as warm up suggest some dodgy cap to me!
7 Comments
I appreciate your blog on the A9M0005 very much. I’ve got a large collection of vintage Mac stuff I’m getting in working order to sell. Currently I’ve been stuck on this ProFile drive for a LISA 2 that I’ve finally got working. I’m very interested in conversing with you on this topic if you are still active with it. I’ve a good electronics/computer background but I don’t have schematics or any extra units to test against when it comes to this ProFile. Hope to hear from you.
obi1990 at hotmail dot com
Hi Obix,
Does the stepper motor on the side of the Seagate drive try to move?
Hi Adrian, not sure if you got my email or not (MUCH more descriptive ;o) ) No, the stepper does not go into ‘Sector Check’ mode, all that happens is the drive motor spins up. After ~60sec it should start the check but does not. I replaced a number of bad cap’s in power supply (still worried it may be the main transformer in the supply). On the controller board both U7 and U8 were burnt out (stepper motor driver), I replaced both these with new matching ULN2074B’s. There are two sudo-SMD cap’s on the controller board that are questionable, they don’t seem to have part numbers, curious. The power supply (disconnected from Controller Board and Hard Disk) gives the following voltages relative to COM:
Purple -16.20 (-12vdc)
White 0v (AC OK)
Blue 14.05 (+12vdc)
Red 1.80 (5vdc)
The five volt wire seems questionable. If you had a working model and could give some supply voltages and some TP voltages from the controller that would be awesome!
Thanks,
obix
I just got the tech specs and schematic for the ProFile’s analog board, hopefully will find some answers there, I also just pulled the main transformer T1 so will be comparing and testing later today.
Update: The 5vdc output from power supply is OK. I would like to find out though if the WHITE wire from the power supply to the Control Board (the AC OK connector)shows a voltage when everything is connected and powered on, I show a few millivolts, something seems strange there, I’m not sure how this works. I’ve got the data and schematics for the power supply and analog board but I still haven’t found one for the Control Board yet…
obix
Update: Got the schematic for the Control Board now…
BAMMMMM !!!! Mission Success ;o)
Got the schematic for the Control Board, was tracing down the ‘Power AC OK ‘ signal which led to the 4-bit binary counter chips U10 and U16. U10 was hotter then I thought it should be and it output didn’t seem to match up with the data sheet… DM74LS161N. So I dug an old Apple II+ out of the pile and found some SN74LS161N’s and swapped them out… it went into and complete the sector scan so I hooked it back up and… IT BOOTED ;o) The drive was even good, I’m editing someones Christmas letter from 1982 right now. Well gotta go and email all my geeky pals… If you’d like some info on this unit I’ve collected almost everything I think, email me at obi1990 at hotmail dot com .
Laters,
obix