SE30 SCSI Repair Questions

2013-11-08 Thread Scott Lawrence
Hi all!  I finally got a compact mac back in my collection!  (I used to 
have about 30 compact macs, but gave them all away after a flood did it's 
worst on most of them.  :(

I now have an SE/30, imo the prettiest of all of the compacts... It worked 
okay when I got it, no sound though.  I put a drive in, installed 7.1 on it 
and then the SCSI chain stopped responding. I figured it was caps, so I 
replaced all of the capacitors with modern ones of the same value.  Sound 
returned, and it booted up fine... from floppy.  To check things out, I did 
try the hard drive and scsi cable on another board (I have a few SE 
mainboards lying around, so I dropped one in.  I checked connectivity on 
the board against schematics as well as test diagrams that people have 
made...

So here are the symptoms:

SCSI Drive does not function either on the internal or external chain 
connectors with appropriate terminaton
(doesn't work without termination either... i had to try it. ;)
SCSI Drive is known working (tested with SE motherboard)
SCSI Cable is known working
New battery on the board
Power Supply outputs expected voltages
Appropriate power appears on drive connector, as well as on SCSI header
Fuses are ok on the board.
inductors are ok as well.
SCSI controller chip's 44 pins were continuity-tested to their appropriate 
connections on other chips or the SCSI headers
All pins from the internal 50 pin header do connect to the correct 
locations on the DB25 external connector
No shorts were found on these headers.

Apple HDSC Utility shows no SCSI drives present
Hacked Apple HDSC Utility (for non-apple branded drives) also shows no SCSI 
drives present
SCSI probe complains that the chain is not terminated.

Termination power is present on both SCSI connectors. (4.7 volts, approx) 
I jumpered across to give it the 5.02 volts measured on the floppy port, 
thinking 4.7 wasn't enough, but that did not change anything.

I'm at a loss at this point.  About the only thing I can think of is that 
the 53c80 SCSI chip is faulty... that seems to be the only place left for a 
fault...

Thoughts?

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reviving Mac Classic?

2013-11-08 Thread Bruce Ryan
Hello there vintage Maceteers

A shaggy-dog-story and some newbie questions:

I've just received a Mac Classic (model number M1420). I should say at the 
start that it was free, and it came as described: 'It makes the sound of 
the hard disk running. There are a couple of screws missing at the back of 
the casing. It has a keyboard and a mouse.'

Indeed, when I switch on the power, a sound begins but it seems more like a 
fan starting up than a hard disk. The screen doesn't change from black. 

When I moved the unit around, I heard something moving inside the case. So 
I shone a torch through the floppy-drive hole and had a look. It seems 
there are bits missing - I can see right to the back of the case and there 
is plenty of unused space. There's no sign of the floppy drive. There is an 
actual floppy disk loose inside the machine.

So, my questions:

   - What tools do I need to open the case and see if things really are 
   missing? 
   - If I recall correctly, the CRTs in these macs can retain lethal charge 
   for a while. So how long should I leave the machine disconnected from power 
   before trying to open it?
   - If bits are missing, would they be easy to obtain? (I'm in the UK.)

I don't have a lot of money or time to spend failing to revive an old mac. 
So I'd appreciate a general opinion on whether it's worth trying. Of course 
I'm happy to try to supply more information if that will help generate 
answers.

Many thanks

Bruce

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Re: SE30 SCSI Repair Questions

2013-11-08 Thread J.S. Garrison
Check to see if the drive is spinning?

Jeff






 From: Scott Lawrence yor...@gmail.com
To: vintage-macs@googlegroups.com 
Sent: Friday, November 8, 2013 1:19 PM
Subject: SE30 SCSI Repair Questions
 


Hi all!  I finally got a compact mac back in my collection!  (I used to have 
about 30 compact macs, but gave them all away after a flood did it's worst on 
most of them.  :(

I now have an SE/30, imo the prettiest of all of the compacts... It worked okay 
when I got it, no sound though.  I put a drive in, installed 7.1 on it and then 
the SCSI chain stopped responding. I figured it was caps, so I replaced all of 
the capacitors with modern ones of the same value.  Sound returned, and it 
booted up fine... from floppy.  To check things out, I did try the hard drive 
and scsi cable on another board (I have a few SE mainboards lying around, so I 
dropped one in.  I checked connectivity on the board against schematics as well 
as test diagrams that people have made...

So here are the symptoms:

SCSI Drive does not function either on the internal or external chain 
connectors with appropriate terminaton
(doesn't work without termination either... i had to try it. ;)
SCSI Drive is known working (tested with SE motherboard)
SCSI Cable is known working
New battery on the board
Power Supply outputs expected voltages
Appropriate power appears on drive connector, as well as on SCSI header
Fuses are ok on the board.

inductors are ok as well.
SCSI controller chip's 44 pins were continuity-tested to their appropriate 
connections on other chips or the SCSI headers

All pins from the internal 50 pin header do connect to the correct locations on 
the DB25 external connector
No shorts were found on these headers.

Apple HDSC Utility shows no SCSI drives present
Hacked Apple HDSC Utility (for non-apple branded drives) also shows no SCSI 
drives present
SCSI probe complains that the chain is not terminated.

Termination power is present on both SCSI connectors. (4.7 volts, approx) 

I jumpered across to give it the 5.02 volts measured on the floppy port, 
thinking 4.7 wasn't enough, but that did not change anything.

I'm at a loss at this point.  About the only thing I can think of is that the 
53c80 SCSI chip is faulty... that seems to be the only place left for a fault...

Thoughts?
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Re: reviving Mac Classic?

2013-11-08 Thread J.S. Garrison
Always take the challenge of making a Classic Mac work again. A satisfying, 
albeit sorta frustrating experience. I use a Harbor Freight toolkit that uses a 
thin but tough extending-shaft driver. It accepts bits of which one is a T-15 
torx. The driver stretches enough to allow unscrewing the torx screws inside 
the handle.

To open it, I lay the Mac face down on a tri-folded cotton towel and, after 
removing the bottom screws first, tap on a loosened partly removed handle screw 
with my palm on the back of the extending driver until the top of the case 
splits. It's a tight press-fit. Other folks use a Mac Cracker, a spreader 
resembling a spring clamp. I avoid them as they can mar the seam if too much 
fumbling occurs.

Don't power it on again until you have it open. Loose parts inside can make the 
damage worse.


Jeff



From: Bruce Ryan bruce.r...@mac.com
To: vintage-macs@googlegroups.com 
Sent: Friday, November 8, 2013 3:50 PM
Subject: reviving Mac Classic?
 


Hello there vintage Maceteers

A shaggy-dog-story and some newbie questions:

I've just received a Mac Classic (model number M1420). I should say at the 
start that it was free, and it came as described: 'It makes the sound of the 
hard disk running. There are a couple of screws missing at the back of the 
casing. It has a keyboard and a mouse.'

Indeed, when I switch on the power, a sound begins but it seems more like a fan 
starting up than a hard disk. The screen doesn't change from black. 

When I moved the unit around, I heard something moving inside the case. So I 
shone a torch through the floppy-drive hole and had a look. It seems there are 
bits missing - I can see right to the back of the case and there is plenty of 
unused space. There's no sign of the floppy drive. There is an actual floppy 
disk loose inside the machine.

So, my questions:
* What tools do I need to open the case and see if things really are 
missing? 
* If I recall correctly, the CRTs in these macs can retain lethal 
charge for a while. So how long should I leave the machine disconnected from 
power before trying to open it?
* If bits are missing, would they be easy to obtain? (I'm in the UK.)
I don't have a lot of money or time to spend failing to revive an old mac. So 
I'd appreciate a general opinion on whether it's worth trying. Of course I'm 
happy to try to supply more information if that will help generate answers.

Many thanks

Bruce
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Re: SE30 SCSI Repair Questions

2013-11-08 Thread Scott Lawrence
Yes. The drive is running. It does it's startup seek, same as if it were 
unplugged or when it was plugged into the SE motherboard. It takes it a few 
moments then it shows the ? Mac icon. 

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Re: reviving Mac Classic?

2013-11-08 Thread Scott Lawrence
I've actually found that the Craftsman 6 shaft Torx T15 is perfect for 
unscrewing these. It gets those two screws in the handle area without problems 
at all. :)

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RE: reviving Mac Classic?

2013-11-08 Thread Wesley Furr
Someone may know more than I do...but from what I gather they can hold a
charge for a VERY VERY long time...perhaps indefinitely?  That's what bugs
me about all the warnings of dire injury on electric devices.  Most things
are safe if you aren't stupid...but a monitor that can be deadly long after
unplugging has the exact same warning on it that everyone has learned to
ignore...
 
I'm sure if you are careful not to touch anything around the tube, you
should be OK...
 
Wesley
 

  _  


*   If I recall correctly, the CRTs in these macs can retain lethal
charge for a while. So how long should I leave the machine disconnected from
power before trying to open it?

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Re: SE30 SCSI Repair Questions

2013-11-08 Thread J.S. Garrison
ccee
The method I used is, with a known-working internal and external floppy drive, 
is boot a system 6.0.8. disk find and use the Micromat system 6 removable and 
internal disk utility. 


Another, easier to find utility is the usually fail-proof La CieSilverlining 
which I will use in a bootable System 7.5 environment. If that drive is 
mountable, the La Cie utility will indoctrinate it to a mounted condition.

Many folks don't like Silverlining because of the problems it manifested in 
System 7. But it, along with Lido 7.5.6, which wants system 7.1 to OS8.x to 
work, almost always, for me anyway, made a rogue hard disk appear on the 
desktop.

I want to be absolutely sure that the hard drive isn't bad so I look at the 
SCSI cable, motherboard connector and drive connector conditions (i.e bent or 
missing pins), and potentially missing terminators on the hard drive's 
controller board. I look at drive-controller jumpers and use Google to see if 
these are set correctly (from the maufacturer's site or other trusted sites).


To foolproof my testing, I will connect the drive to an Adaptec SCSI Card in a 
Pentium II or III PC and run MHDD, which is a bootable Linux-based CD that 
checks sectors for condition, and can repair damaged sectors software-wise, AND 
format the drive with MHDD.

This opens the door for the La CieSilverlining to take charge and make a 
working drive Mac-accessible, IF it's not toast.

Jeff

   




 From: Scott Lawrence yor...@gmail.com
To: vintage-macs@googlegroups.com 
Sent: Friday, November 8, 2013 4:27 PM
Subject: Re: SE30 SCSI Repair Questions
 

Yes. The drive is running. It does it's startup seek, same as if it were 
unplugged or when it was plugged into the SE motherboard. It takes it a few 
moments then it shows the ? Mac icon. 


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Re: reviving Mac Classic?

2013-11-08 Thread J.S. Garrison
I had, for years, a custom welded torx driver that was 2 feet long. I left it 
behind at the Recycling Plant, so I had to improvise with a lesser but workable 
tool.


Jeff





 From: Scott Lawrence yor...@gmail.com
To: vintage-macs@googlegroups.com 
Sent: Friday, November 8, 2013 4:29 PM
Subject: Re: reviving Mac Classic?
 

I've actually found that the Craftsman 6 shaft Torx T15 is perfect for 
unscrewing these. It gets those two screws in the handle area without problems 
at all. :)


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Re: reviving Mac Classic?

2013-11-08 Thread J.S. Garrison
Macs after the Plus (?) have a bleed-off circuit that kills any left-over 
charge in the suction cup plug that attaches to the CRT.
Within moments of shut down there is no residual electrical potential to zap 
you. I hedge my bets by grabbing the suction cup with a pliers, having 
insulated handles, and touching the Mac's frame with the hidden 
springy-thingy inside the suction cup.

All the usual precautions and warnings must apply here.



Jeff




 From: Wesley Furr wes...@megley.com
To: vintage-macs@googlegroups.com 
Sent: Friday, November 8, 2013 5:11 PM
Subject: RE: reviving Mac Classic?
 


Someone may know more than I do...but from what I 
gather they can hold a charge for a VERY VERY long time...perhaps 
indefinitely?  That's what bugs me about all the warnings of dire injury on 
electric devices.  Most things are safe if you aren't stupid...but a 
monitor that can be deadly long after unplugging has the exact same warning on 
it that everyone has learned to ignore...
 
I'm sure if you are careful not to touch anything 
around the tube, you should be OK...
 
Wesley
 



 
* If I recall correctly, the CRTs in these macs can retain lethal 
charge for  a while. So how long should I leave the machine disconnected from 
power before  trying to open it?
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Re: SE30 SCSI Repair Questions

2013-11-08 Thread Scott Lawrence
Well, like I said, I know the drive, scsi cable, power supply are all good, 
since I have my SE board in that case right now, running System 7.1 off of 
a 340 meg hard disk.  (Which I installed using that SE/30 before it failed.)

I'd love to try out those formatting tools, but I can't get the machine to 
see any device on the SCSI chain.  HDSC setup and the hacked version of 
HDSC setup both claim that the scsi chain is not terminated.  

It's not that the drive isn't formatted, it's got a working install of OS 
7.1.  It's just not visible with the SE/30 board.

-s

On Friday, November 8, 2013 10:08:36 PM UTC-5, The Old Geek wrote:

 ccee
 The method I used is, with a known-working internal and external floppy 
 drive, is boot a system 6.0.8. disk find and use the Micromat system 6 
 removable and internal disk utility. 

 Another, easier to find utility is the usually fail-proof La 
 CieSilverlining which I will use in a bootable System 7.5 environment. If 
 that drive is mountable, the La Cie utility will indoctrinate it to a 
 mounted condition.

 Many folks don't like Silverlining because of the problems it manifested 
 in System 7. But it, along with Lido 7.5.6, which wants system 7.1 to OS8.x 
 to work, almost always, for me anyway, made a rogue hard disk appear on the 
 desktop.

 I want to be absolutely sure that the hard drive isn't bad so I look at 
 the SCSI cable, motherboard connector and drive connector conditions (i.e 
 bent or missing pins), and potentially missing terminators on the hard 
 drive's controller board. I look at drive-controller jumpers and use Google 
 to see if these are set correctly (from the maufacturer's site or other 
 trusted sites).

 To foolproof my testing, I will connect the drive to an Adaptec SCSI Card 
 in a Pentium II or III PC and run MHDD, which is a bootable Linux-based CD 
 that checks sectors for condition, and can repair damaged sectors 
 software-wise, AND format the drive with MHDD.

 This opens the door for the La CieSilverlining to take charge and make a 
 working drive Mac-accessible, IF it's not toast.

 Jeff



   --
  *From:* Scott Lawrence yor...@gmail.com javascript:
 *To:* vintag...@googlegroups.com javascript: 
 *Sent:* Friday, November 8, 2013 4:27 PM
 *Subject:* Re: SE30 SCSI Repair Questions
  
 Yes. The drive is running. It does it's startup seek, same as if it were 
 unplugged or when it was plugged into the SE motherboard. It takes it a few 
 moments then it shows the ? Mac icon. 


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