Thread

SE30 thinks there is an external drive attached

68kMLA Troubleshooting 24 posts May 1, 2015 to May 9, 2015

#1 Fri, 1 May 2015 - 22:02 68kMLA

Got an SE30 going, however, it continually give a dialog box stating the disk is unrecognized and asks to reject or initialize. The icon shows an external disk drive in the warning box, but there is no external disk drive connected.

Is this a hardware or software problem? System 7.1 installed on a scsi2sd card which seems to be working ok.

#2 Fri, 1 May 2015 - 22:41 68kMLA

I would guess the floppy drive is stuck in and it does not move or something to that effect.

#3 Fri, 1 May 2015 - 22:45 68kMLA

If it thought it was the floppy, it would show a floppy icon.

Do you not have a floppy you can boot from?

#4 Fri, 1 May 2015 - 23:25 68kMLA

The internal floppy is working ok.

The warning box shows a Mac with an external floppy drive next to it with the warning.

Should have clarified that

#5 Fri, 1 May 2015 - 23:46 68kMLA

caps? corrosion on motherboard?

#6 Fri, 1 May 2015 - 23:46 68kMLA

battery explosion?

#7 Fri, 1 May 2015 - 23:51 68kMLA

Caps have been replaced (not by me) no battery it was removed and there was no corrosion.

Is the searching for the external floppy part of the rom, software, or other hardware?

For some reason it is detecting an external floppy drive that isn't there

#8 Sat, 2 May 2015 - 00:13 68kMLA

Maybe it's a faulty Bourns filter?

That seems to be a common cause of bizarre floppy-related problems like this.

c

#9 Sat, 2 May 2015 - 00:27 68kMLA

I've had read/write problems with bourns in the past, but not this. Uniserver or technight would be the experts on that.

#10 Sat, 2 May 2015 - 01:27 68kMLA

cc-333 is correct the problem is the bourns filter has gone bad. its a common problem.

they go bad in a few different ways, causing oddness. i change those... but usually i suggest that if you change one, you should change all 3. if one is starting to go bad, its probably going to start happening to the other ones as well causing other strange oddness.

(6) If solution (5) doesn't work either, replace the network filter RP2 (Bourns 4120R-601-250/201).
Also see 9. Bright Monitor with neither Arrow Pointer nor Startup

http://www.biwa.ne.jp/~shamada/fullmac/repairEng.html

these filters do go bad on many other mac's as well.

Screen Shot 2015-05-01 at 8.26.08 PM.png

#11 Sat, 2 May 2015 - 01:52 68kMLA

Ok. I'll change them if I have any. If not, I'll PM you. Been looking for spares, but seems like 30 is minimum order.

#12 Sat, 2 May 2015 - 02:25 68kMLA

Found a couple you sent me a while back, uni. I'll update

#13 Sat, 2 May 2015 - 03:33 68kMLA

Its a little late for me to post, but I agree with CCC's and Uniserver's findings.

#14 Sat, 2 May 2015 - 15:57 68kMLA

Could you take a photo? I don't think I've ever seen an "external disk drive icon". What happens if you boot an earlier system from the internal floppy, like System 6?

#15 Sat, 2 May 2015 - 16:22 68kMLA

i have. when those filters go bad they can cause any of the above.

#16 Sat, 2 May 2015 - 16:22 68kMLA

but my all means pictures are nice

#17 Sat, 2 May 2015 - 18:49 68kMLA

bigmessowires said:
Could you take a photo? I don't think I've ever seen an "external disk drive icon". What happens if you boot an earlier system from the internal floppy, like System 6?

That depends on the system it is on - if is on a Classic 9in B/W Mac, the icon I seen is the Mac icon with a little external drive next to it with an arrow pointing down the external drive. On the Mac IIcx/ci, I seen the Mac IIcx/ci with an external drive next to it with the arrow pointing down to the external drive.

This I seen on both System 6 & 7.

#18 Fri, 8 May 2015 - 18:45 68kMLA

Sorry Indidnt take a photo, but Rlfen described it correctly. I can't take a photo now, because the problem has been fixed.

Thanks to C and uniserver, Bourne filters have been replaced and the problem is gone!

#19 Fri, 8 May 2015 - 18:46 68kMLA

BMOW, I don't recall if it happened when I booted from the floppy. It did happen when booted from an external drive though.

#20 Fri, 8 May 2015 - 19:20 68kMLA

cool u da man!!!

#21 Fri, 8 May 2015 - 20:48 68kMLA

Couldn't have done it without your help!

#22 Fri, 8 May 2015 - 21:17 68kMLA

was it tough getting that old filter out buddy?

#23 Sat, 9 May 2015 - 00:40 68kMLA

I gave up and gave the board to a friend who has professional equipment for removing things like chips.

The right equipment does a nice job without the damage I would do.

#24 Sat, 9 May 2015 - 01:57 68kMLA