5 Feb
2011
5 Feb
'11
1:58 a.m.
I've now narrowed the problem with the floppy drive.
I've been exercising the drive quite a bit and the "non-spin" problem is
less than it was. Rather than happening all the time it is now
internittent.
When the drive is not being accessed but power is on a disk is inserted the
drive should spin for a while then stop. There is a switch that is
triggered via light beam when the disk is inserted. I think this is the
only sensor that detects the disk presence. When this switch is tripped the
head ALWYAYS moves a little on the stepper but the disk platter only spins
about 60% of the time?? If the platter doesn't spin, and you manually turn
it a little very often the next time the switch is triggered it WILL spin.
Someitmes after a no spin when you move it manually it spins forward for an
instant even though the switch is open, as if there is residual roational
force there. Not always though.
I'm sure the problem is not with the light beam detection as the stepper
always moves. Somewhere between the switch and the motor itself the signal
seems to get lost, or at least isn't strong enough to start the flywheel
off. It interesting that the problem has lessened with use. I thought
maybe the flywheel was a bit sticky but it turns very freely. I've oiled
the spindle also.
Anyone else come across this problem on old 400k Mac/Lisa drives?
Terry
----- Original Message -----
From: "Terry Stewart" <terry at webweavers.co.nz>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Saturday, February 05, 2011 2:36 PM
Subject: Re: Apple Lisa 2/10 - Progress
More progress,
I was kindly donated a IWM chip for the Lisa 2/10 by the original seller
of these Lisas I have. He extacted it from a Mac 128 board he had lying
around.
I'm happy to report the machine now boots up. I'm not sure how much
further I'm going to be able to take it though. The widget AND the floppy
drive both have issues. I feel I might be able to fix the floppy. The
widget seems a pretty complicated piece of machinery, info is sparse and I
think might be beyond my limited skills.
Here is a description of the problem with the widget. The certainly spins
and I can hear a definte clack when the break comes off. I can hear drive
seeking noises and the light flashes. I then get an "Error 82". From
what I can read this is a fairly generic error which just means the
internal drive is not working properly. I've tried to install the Lisa
Office Suite and Macworks XL 3.0 from floppy. In the former case I'm told
there is no suitable hard disk to install on, and the latter throws up an
error 96. I've reseated all socketed chips to no avail. It could be a
case of just requiring a low-level format, but I can't find anything on
the web that suggests anyone actually knows how to do this.
The 400k floppy drive has a weird problem. The stepper moves a little on
a disk access call but the motor to rotate the disk doesn't go? The disk
ejects ok. Things have been cleaned and lubed and I am using DD disks
this time. I suspect it might be a sensor problem because once I was
examining the drive when the machine was accessing it and tilted the
embedded disk up slightly at the front. Suddenly it whirred into life and
loaded the disk and the next disk I put in. Then it stopped working again
after that. It could be a sensor maybe? Interestingly my other (spare)
400k shows exactly the same problem? However, the drive from my recently
fixed Lisa 2 is fine and it was that drive I used to attempt to re-install
software on the widget.
I'm going to persist with trying to fix the floppy drives. Given that at
least one of the drives did work for a short amount of time is hopeful.
If nothing comes to light on the widget, I'll either just abandon trying
to fix it and be happy with just a working Lisa 2, and/or perhaps simply
look at getting one of these:
http://cgi.ebay.com/Profile-Widget-Emulator-Board-Apple-Lisa-Apple-III-/140…
.It's quite expensive though and I do like to have things original.
I'll have to mull on it.
Terry
----- Original Message -----
From: "Terry Stewart" <terry at webweavers.co.nz>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Thursday, January 27, 2011 9:10 PM
Subject: Apple Lisa 2/10 - Progress
Ok, for those that have been following this
project of mine there has
been progress.
I had a friend visit today who owns a Lisa 2/10. He bought some of his
Lisa ICs with him for swap-out diagnostic purposes.
The cause of the Lisa 2/10 failing its diagnostic test was indeed one of
the two ICs under suspicion on the I/O board . It was the IWM Apple
344-0041 (Integrated WOZ machine controller). The other suspect., the
ROM, appears OK (even though it seems a highly unusual version..I should
learn to use my new (unused) ROM burner and take a copy of the ROM for
posterity).
However, the widget drive itself throws up an error. First things first
though. I'll source a replacement IWM chip first, then worry about the
widget drive. It might just need some exercise.
My friend also had an IDEFile ProFile drive emulator which we hooked up
to my working Lisa 2. Whoo hoo, it was great to see the Lisa Office
Suite boot into action. It looked very cool and in 1983 it would have
looked even cooler!
Tez
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