SE/30: another battery leak victim (in the bag)

[marcelv]

Got another SE/30 with leaking maxwell. This one has a different leak pattern while is was stored in an apple Macintosh bag on its back.

you can see the leakage dripping down to the ports on the back side of the board.

the video rom lost a number of legs

the 68030 has holes from the corrosion

have removed the video rom, socket, battery holder and capacitors  and cleaned the board 

 

[techknight]

Thats actually not too bad, its far better than what I typically see these. It may be easier to restore than others. 

You will need a good desoldering iron to remove that 68K CPU, and if you go through that trouble, install a socket. and then install a new CPU. 

you might be able to burn an EPROM that works in place of that video ROM, but you will need to look out for broken traces/vias. Should be alot less than normal.

Only thing I am unsure about is the ROM SIMM/Socket, and the 74F253 muxes because the picture just isnt good enough for that section so I dont know how bad the damage is there. 

 

[marcelv]

i have to replace UE8, has too much corrosion, rest of the muxes seem ok.

the rom socket looks ok, with a magnifier I can see some black corrosion, have to figure out how to remove it

the rom did have corrosion on the upper half of the connection points , removed the corrosion using a fiber brush and put new solder on

 

[marcelv]

- replaced UE8 (and fixed some connections)

- replaced UK6 video rom socket

- made 2 wire connections from the video rom socket to J13 

- burned a 27C64 eprom with the SE30 video rom

- cleaned up some more

- lubricated the disk drive

The SE/30 is working ! so the 68030 is still working even though is has holes from the battery corrosion.

to do:

- put the capacitors on the logic board

- replace the disk drive connector internal, (missing some pins)

- replace the external disk drive connector (very corroded)

- treat the rust on the chassis

- get the hard disk running

 

[techknight]

Wow, you certainly did get lucky..

but yea, I would clean up the best you can with the CPU, and then seal the holes with some Epoxy or something. 

the 20 pin floppy drive connector will need replaced, sometimes you can get away with pulling the bad pins and inserting 2 new pins from a new connector but thats tricky at best. 

 

[marcelv]

removed the 20 pin connector, ordered a new one.

there was more corrosion under the connector so best thing to replace it.

What do you recommend to seal the CPU holes with?

 

[joshc]

Just want to say, great job you've done with this - it's always impressive and really nice to see another SE/30 board being saved!

 

[PotatoFi]

Truly impressive work. Thank you for rescuing this board!

 

[marcelv]

progress

- replaced the 20 pin connector

- put the capacitors on the board and booted from the floppy emu

- treated the rust on he chassis

- booted using a floppy disk and with the floppy emu

the se/30 will not boot from the scsi hd, it starts to boot but after a while the question mark disk comes back, think the scsi drive has bad sectors

What is the best tool to fix bad sectors on the scsi drive?

 

[LaPorta]

Does the HD show up on the desktop when you start from the floppy emu at all, or no? I’d wager that your SCSI system is fine or you wouldn’t be able to start at all.

 

[marcelv]

Tried to install  system 7 on the Macintosh HD, got an error message unable to install.

will try with another HD to check if the scsi is ok.

 

[marcelv]

The Macintosh HD does show up when booted from floppy emu,

am able to open some of the folders but when I open the system folder the mac  keeps searching a long time,

are there tools to check the disk?

 

[archer174]

Excellent work! My favorite machines in my collection are the ones that originally looked the worst. Is there a hardware diagnostic utility for the SE/30? On the NeXT side of things we have the factory utility for some of the machines which I run after something this extreme. It seems like there could be a lot of corner case issues that would be hard to diagnose. 

 

[radiorich]

Hello Marcelv,

First all nice job on your repair 

well I lucked  out on my Mac Se/30 the battery was still good no leakage and a very minor  corrosion as you can see in the photo .

Anyway Marcely Did you use Tantalum capacitors to replace the SMD caps 

my board has 8 sticks of ram 

 

[marcelv]

Personally I always use tantalum to replace the smd caps

 

[davidg5678]

What is the best tool to fix bad sectors on the scsi drive?

You could try using Norton Disk Doctor: https://macintoshgarden.org/apps/norton-utilities-20

It is also possible that your mechanical hard drive is failing and needs to be replaced, so there might not be a ton that can be done to fix this drive. It is equally possible that the SCSI circuitry was damaged by the corrosion and needs to be repaired. You can try testing with a known good drive to see if it is all SCSI that is broken or just one hard disk. You might also want to look into replacing the drive with a SCSI2SD and seeing if that solves the issues you are having.

 

[radiorich]

Hello Marcelv,

Thanks and when to this point I hope my hard drive is good Anyway David that's so great info.

Marcelv  good luck with your machine and keep up the good work

 

[marcelv]

I created the following table to check the connections between the video rom and other components

Also checked the address and data lines connectivity to the cpu and copro

maybe someone can use this to check their board.

 

[techknight]

To answer your question about the CPU, just use 2-part epoxy and seal it up. Not a huge ordeal. Just make sure you neutralize what electrolytes are there, sand it a bit, and then epoxy it.