From: William Levak (wlevak_at_sdf.lonestar.org)
Date: 2008-08-04 08:36:29
On Sun, 3 Aug 2008, Anders Carlsson wrote:
> Hello,
>
> I have picked up a number of broken CBM 3040/4040 drives. They have
> various faults, and my hope was to be able to pull parts and assemble
> at least one, perhaps two working drives from them. Out of 6 drives, I
> have so far managed to find one working DOS board, one drive board and
> two mechanisms so I could put together one drive.
>
> In order to verify working parts, I start with plugging in the DOS
> board itself and read the error channel from a 8032 using PRINT DS$.
> Three of the remaining boards return a lot of garbage in an endless
> loop, while two boards do nothing.
>
> I don't think I have any 3040/4040 service manuals handy, although I
> found a 2031 one on Zimmers' FTP. Would that be of any use for me?
There should be 2040 schematics on Zimmers'. The 2040, 3040, and 4040 are
the same machine. I have one 4040, but it is on the bottom of the stack.
I'll try to get it out in the next few days.
When turned on, the drive motors should come on, and all the lights flash,
and then turn off.
> More importantly, does anyone recognize the fault described above, where
> the error channel keeps spewing random data? Which chips if any should I
> suspect: 6502, 6522, 6532, ROM... or something completely different?
For the boards that do nothing, check the voltage regulators.
> Maybe those boards who show no sign of life would be easier to get to
> work. In that case, which chip(s) are most likely to be broken if it does
> not respond at all? I probably should plug in the power LED to see that it
> powers up, but if I understand correctly these drives don't blink in any
> pattern unlike the 8050, 8250 and the 9000 series hard drives.
The 2040/3040/4040 drives use the same blink code as the other Commodore
drives. For the boards that send garbage, check the IEEE bus drivers at
UB1, UB2, abd UD2.
wlevak@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org
Message was sent through the cbm-hackers mailing list
Archive generated by hypermail pre-2.1.8.