[rescue] SPARCclassic restoration

Discussion:

Richard

2018-03-27 10:24:39 UTC

Hi Folks

Trying to bring back a SPARCclassic. Just finished rebuilding the power supply and it now powers up.

However it fails to get past the following which is the first thing that comes out on the serial console.

ERROR: FPU Exception Did Not Block Store, addr = 00600000, exp =00000000,
obs = -f884010, xop = 0f884010
U-NUMBER : Suspect Tsunami Module

Any suggestions, thoughts or guidance on the above error greatly appreciated.

Regards

Richard
_______________________________________________
rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

Richard

2018-03-27 11:38:38 UTC

Permalink

Quick update

OK so on a hunch replaced the NVRAM chip.

On power on, Pressing STOP-D to start power on self test. Serial console plugged into ttya.

The machine now gets through post past the below error and goes through to
....
NVRAM Access Test
TOD Registers Test
Then identifies the memory in each bank

and then powers off....!? Might have more work to do on the power supply.

Richard

Post by Richard
Hi Folks
Trying to bring back a SPARCclassic. Just finished rebuilding the power
supply and it now powers up.
However it fails to get past the following which is the first thing that
comes out on the serial console.
ERROR: FPU Exception Did Not Block Store, addr = 00600000, exp =00000000,
obs = -f884010, xop = 0f884010
U-NUMBER : Suspect Tsunami Module
Any suggestions, thoughts or guidance on the above error greatly appreciated.
Regards
Richard
_______________________________________________
rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

_______________________________________________
rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

Mike Spooner

2018-03-27 12:12:19 UTC

Permalink

I've seen this "mystery sudden poweroff after POST" on a couple of
SPARCclassics a few years back. A replacement PSU fixed one of them but
not the other :-(.

I suppose the obvious belt-and-braces thing to check is the RAM SIMMs -
must be installed in pairs, try with just a single pair of 16Mb SIMMs,
one each in the 1st and 4th slots counting from the SBus end of the
chassis, and swap-in any other 16Mb 72-pin parity SIMMs you have lying
around to see if that helps.

Of course, it could still be a PSU issue... If you remove the internal
HDD, does it try to boot off the net after POST?

Out of curiosity, what did you have to do to the PSU to get this far?

-- Mike Spooner

--------- Original Message ---------
From: Richard
To: ***@sunhelp.org
Date: Tue Mar 27 12:38:38 GMT+01:00 2018
Subject: Re: [rescue] SPARCclassic restoration
Quick update

OK so on a hunch replaced the NVRAM chip.

On power on, Pressing STOP-D to start power on self test. Serial console
plugged into ttya.

The machine now gets through post past the below error and goes through
to
....
NVRAM Access Test
TOD Registers Test
Then identifies the memory in each bank

and then powers off....!? Might have more work to do on the power supply.

Richard

=00000000,

Post by Richard
obs = -f884010, xop = 0f884010
U-NUMBER : Suspect Tsunami Module
Any suggestions, thoughts or guidance on the above error greatly appreciated.
Regards
Richard
_______________________________________________
rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

_______________________________________________
rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
_______________________________________________
rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

William Enestvedt

2018-03-27 12:41:52 UTC

Permalink

Post by Mike Spooner
I've seen this "mystery sudden poweroff after POST" on a couple of
SPARCclassics a few years back. A replacement PSU fixed one of them but
not the other :-(.

Would the PSU from another lunchbox Sun work?

- Will
b
Will Enestvedt
"Be the person Mr. Rogers knew you could be."
_______________________________________________
rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

Richard

2018-03-27 19:58:44 UTC

Permalink

Hi Will

Certainly on the list of options. Trying to avoid USD$80 + shipping for a pull
from another unit that may then have the same issue.

Thanks for the thoughts

Richard

Sent from my iPhone

Post by William Enestvedt

Post by Mike Spooner
I've seen this "mystery sudden poweroff after POST" on a couple of
SPARCclassics a few years back. A replacement PSU fixed one of them but
not the other :-(.

Would the PSU from another lunchbox Sun work?
- Will
b
Will Enestvedt
"Be the person Mr. Rogers knew you could be."
_______________________________________________
rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

_______________________________________________
rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

Richard

2018-03-27 19:56:42 UTC

Permalink

Hi Mike

So to get this far I have replaced all but 2x capacitors on the low voltage
side of the PSU. One is a 1200uF electrolytic which just isnbt in the
available catalogues locally. Would appreciate substitution thoughs if anyone
has experience. 2000uF? Maybe my answer is there.

Interestingly if I take the HDD off of then PSU then it wonbt boot. So this
suggest I still have a PSU issue.

Have already stripped down the memory as suggested. Also tried different pairs
of SIMM just in case.

So I think I am at
- replace final 2 capacitors
- replace PSU
- wash main board - it looks clean, but never know there might be something
thatbs causing an issue
-?????

Thanks for the thoughts

Cheers

Richard

Sent from my iPhone

Post by Mike Spooner
I've seen this "mystery sudden poweroff after POST" on a couple of
SPARCclassics a few years back. A replacement PSU fixed one of them but
not the other :-(.
I suppose the obvious belt-and-braces thing to check is the RAM SIMMs -
must be installed in pairs, try with just a single pair of 16Mb SIMMs,
one each in the 1st and 4th slots counting from the SBus end of the
chassis, and swap-in any other 16Mb 72-pin parity SIMMs you have lying
around to see if that helps.
Of course, it could still be a PSU issue... If you remove the internal
HDD, does it try to boot off the net after POST?
Out of curiosity, what did you have to do to the PSU to get this far?
-- Mike Spooner
--------- Original Message ---------
From: Richard
Date: Tue Mar 27 12:38:38 GMT+01:00 2018
Subject: Re: [rescue] SPARCclassic restoration
Quick update
OK so on a hunch replaced the NVRAM chip.
On power on, Pressing STOP-D to start power on self test. Serial console plugged into ttya.
The machine now gets through post past the below error and goes through to
....
NVRAM Access Test
TOD Registers Test
Then identifies the memory in each bank
and then powers off....!? Might have more work to do on the power supply.
Richard

Post by Richard
Hi Folks
Trying to bring back a SPARCclassic. Just finished rebuilding the power
supply and it now powers up.
However it fails to get past the following which is the first thing

that

Post by Richard
comes out on the serial console.
ERROR: FPU Exception Did Not Block Store, addr = 00600000, exp

=00000000,

Post by Richard
obs = -f884010, xop = 0f884010
U-NUMBER : Suspect Tsunami Module
Any suggestions, thoughts or guidance on the above error greatly

appreciated.

Post by Richard
Regards
Richard
_______________________________________________
rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

_______________________________________________
rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

Richard

2018-03-28 09:51:46 UTC

Permalink

He folks

A bit of an update.

So replaced the final 2 capacitors tonight but still not much further on.

with the HDD disconnected the PSU doesn't fire up (no fan)
with the original HDD the PSU fires up but the machine only boots as far as
testing memory then powers off.
with an alternate HDD the PSU fires up and the machine boots to the OK prompt
and I have been able to reset the ***@. However on boot from the HDD the
machine powers off.
with a second older alternate HDD the machine wont even power up.

So some research found the very good Switch Mode Power Supply FAQ.

https://www.repairfaq.org/sam/smpsfaq.htm#smpsmcp

Based on the above and the comments in the most common problems I suspect that
the over current sensing part of the supply has an issue....now to work out
where that is....

Cheers

Richard

Post by Richard
Hi Mike
So to get this far I have replaced all but 2x capacitors on the low
voltage side of the PSU. One is a 1200uF electrolytic which just isnbt
in the available catalogues locally. Would appreciate substitution
thoughs if anyone has experience. 2000uF? Maybe my answer is there.
Interestingly if I take the HDD off of then PSU then it wonbt boot. So
this suggest I still have a PSU issue.
Have already stripped down the memory as suggested. Also tried different
pairs of SIMM just in case.
So I think I am at
- replace final 2 capacitors
- replace PSU
- wash main board - it looks clean, but never know there might be
something thatbs causing an issue
-?????
Thanks for the thoughts
Cheers
Richard
Sent from my iPhone

Post by Mike Spooner
I've seen this "mystery sudden poweroff after POST" on a couple of
SPARCclassics a few years back. A replacement PSU fixed one of them but
not the other :-(.
I suppose the obvious belt-and-braces thing to check is the RAM SIMMs -
must be installed in pairs, try with just a single pair of 16Mb SIMMs,
one each in the 1st and 4th slots counting from the SBus end of the
chassis, and swap-in any other 16Mb 72-pin parity SIMMs you have lying
around to see if that helps.
Of course, it could still be a PSU issue... If you remove the internal
HDD, does it try to boot off the net after POST?
Out of curiosity, what did you have to do to the PSU to get this far?
-- Mike Spooner
--------- Original Message ---------
From: Richard
Date: Tue Mar 27 12:38:38 GMT+01:00 2018
Subject: Re: [rescue] SPARCclassic restoration
Quick update
OK so on a hunch replaced the NVRAM chip.
On power on, Pressing STOP-D to start power on self test. Serial console
plugged into ttya.
The machine now gets through post past the below error and goes through to
....
NVRAM Access Test
TOD Registers Test
Then identifies the memory in each bank
and then powers off....!? Might have more work to do on the power supply.
Richard

Post by Richard
Hi Folks
Trying to bring back a SPARCclassic. Just finished rebuilding the power
supply and it now powers up.
However it fails to get past the following which is the first thing

that

Post by Richard
comes out on the serial console.
ERROR: FPU Exception Did Not Block Store, addr = 00600000, exp

=00000000,

Post by Richard
obs = -f884010, xop = 0f884010
U-NUMBER : Suspect Tsunami Module
Any suggestions, thoughts or guidance on the above error greatly

appreciated.

Post by Richard
Regards
Richard
_______________________________________________
rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

_______________________________________________
rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

Mike Spooner

2018-03-27 15:02:11 UTC

Permalink

Hi Will,

The PSU from a SPARCstation-LX or a SPARCstation-ZX would be fine in the
SPARCclassic (although not always the other way around in the case of the
'-ZX).
Other lunchbox-format Sun workstation PSUs are "not compatible" according
to Sun, and I wouldn't personally be keen on trying any of the older
lunchbox PSUs.

Regards,
Mike

Post by William Enestvedt

Post by Mike Spooner
I've seen this "mystery sudden poweroff after POST" on a couple of
SPARCclassics a few years back. A replacement PSU fixed one of them but
not the other :-(.

Would the PSU from another lunchbox Sun work?
- Will
b
Will Enestvedt
"Be the person Mr. Rogers knew you could be."
_______________________________________________
rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

_______________________________________________
rescue list - http://www.sunhelp.org/mailman/listinfo/rescue