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Classic Mac Restoration (First Post)
- Thread starter Benno
- Start date
Yes I started it with the LB/ and SCSI removed and it started at a steady 4.85 volts so recapping the logic board will be next, as well as the optocoupler , but in the mean time whilst waiting it was time to pull some caps...no not the caps I should be replacing on the LB but the keyboard, this key board was yellow as yellow can be.
We have just hit spring in Tasmania so on a sunny day what better way to remove 100 odd keyboard caps and clean this old AB up.
So bought the key removal tool, works pretty well, so much gunk under them keys
Blew all the old skin dust pubes what ever out the underneath and liberally washed in IPA.
We have just hit spring in Tasmania so on a sunny day what better way to remove 100 odd keyboard caps and clean this old AB up.
So bought the key removal tool, works pretty well, so much gunk under them keys
Blew all the old skin dust pubes what ever out the underneath and liberally washed in IPA.
Attachments
Finally received the optocoupler today, did some cold start up measurements again before installing
Harddrive and Floppy removed just CRT
5 Volt rail - started 5.4 drops kept dropping to 4.66
12 volt rail down to 10.58
Replaced Optocoupler
Harddrive and Floppy removed just CRT
5 Volt Rail - Steady 4.89 slight fluctuation between 4.89-4.88
12 Volts - steady at 10.94
Adjusted PP1 to get
5 Volt at 4.98
12 Volt 11.16
This is looking good all voltages are steady, Who ever suggested the optocoupler deserves a medal
Plug in HD and Floppy
5 volt rail goes down to 4.83 ( Should this be a concern or adjust the rail higher?)
12 Volts goes up to 11.77
But It boots, quickly, well around 20 seconds, I have no start up sound but playing a game of Lode Runner I had some sound?
Will do the Logic Board Caps next.
1. Some questions, should I go 7.1 or 7.5 on a BlueSCSI ?
2. What is a good quiet replacement fan ?
3. Should I be adjusting the voltage higher atm or wait until I get BlueSCSI
4. Would the sound most likely be cap related LB
And thanks to this forum I would never have got this far already bidding on a new project Mac already
Harddrive and Floppy removed just CRT
5 Volt rail - started 5.4 drops kept dropping to 4.66
12 volt rail down to 10.58
Replaced Optocoupler
Harddrive and Floppy removed just CRT
5 Volt Rail - Steady 4.89 slight fluctuation between 4.89-4.88
12 Volts - steady at 10.94
Adjusted PP1 to get
5 Volt at 4.98
12 Volt 11.16
This is looking good all voltages are steady, Who ever suggested the optocoupler deserves a medal
Plug in HD and Floppy
5 volt rail goes down to 4.83 ( Should this be a concern or adjust the rail higher?)
12 Volts goes up to 11.77
But It boots, quickly, well around 20 seconds, I have no start up sound but playing a game of Lode Runner I had some sound?
Will do the Logic Board Caps next.
1. Some questions, should I go 7.1 or 7.5 on a BlueSCSI ?
2. What is a good quiet replacement fan ?
3. Should I be adjusting the voltage higher atm or wait until I get BlueSCSI
4. Would the sound most likely be cap related LB
And thanks to this forum I would never have got this far already bidding on a new project Mac already
Attachments
Something may still not be right, I don't think the voltage fluctation is to be as expected if everything is operating within spec. Sorry I can't offer more help though - these boards do my head in and I'm certainly no expert at repairing them.
In answers to some of your questions
1. 7.1 because 7.5 is slow on a Classic.
2. The stock one is probably most appropriate, try lubricating it, it should reduce the noise somewhat.
If you try the Sound control panel and click the different alert sounds / change the volume, do you get any sound?
If you plug in headphones and restart the Mac, do you get a boot chime?
In answers to some of your questions
1. 7.1 because 7.5 is slow on a Classic.
2. The stock one is probably most appropriate, try lubricating it, it should reduce the noise somewhat.
If you try the Sound control panel and click the different alert sounds / change the volume, do you get any sound?
If you plug in headphones and restart the Mac, do you get a boot chime?
Thanks for the reply joshc,
Voltage is steady only changes with different things plugged in but doesn't fluctuate so thats ok and it's .5 (will get to LB and replace caps)
So you can lube a fan, any directions on how to do this?
Where is the headphone jack on a Mac Classic ??
Oh yeah
, can't believe I never noticed it!!Thank you!
I tried that and really didn't make any difference, thanks for the advice though.
Bit of an update;
Replaced the caps on the logic board, then had no sound at all, realised I had lifted a pad under one the caps when desoldering, did a trace to the sound chip and now working great! (ugly but effective)
I twisted the last 4 caps and it was much cleaner and easier and will be doing this in the future. So all working great, voltage is stable 4.92 and 11.99, doesn't move.
So I started adjusting the screen and have it looking really nice! I do notice a slight bow at the bottom of the screen, attached some photos hardly noticeable but it is there, anyone shed any light on to what maybe causing this ? Would it be fixable with the adjustments at the rear? or is it something more sinister.
Really happy to have it fully recapped and working and thanks again to everyones help here, I would not have been able to this and have learned a lot in the process so far.
Replaced the caps on the logic board, then had no sound at all, realised I had lifted a pad under one the caps when desoldering, did a trace to the sound chip and now working great! (ugly but effective)
I twisted the last 4 caps and it was much cleaner and easier and will be doing this in the future. So all working great, voltage is stable 4.92 and 11.99, doesn't move.
So I started adjusting the screen and have it looking really nice! I do notice a slight bow at the bottom of the screen, attached some photos hardly noticeable but it is there, anyone shed any light on to what maybe causing this ? Would it be fixable with the adjustments at the rear? or is it something more sinister.
Really happy to have it fully recapped and working
and thanks again to everyones help here, I would not have been able to this and have learned a lot in the process so far.Attachments
68kPlus
Well-known member
Launceston is great, I got my Plus and 512K from there. I sometimes wish I had a broken compact mac to restore, all mine work and always have
.I've never done cosmetic work on my Macs, what do you have in mind?
The BlueSCSI is great, I got a DB25 from RecapAMac last year and it's been fantastic, I use it with my Plus. Be sure to check out the MacPack disk image (on Internet Archive) - it has multiple versions of MacOS (6.0 to 7.5.5 I think), although it's in a .VHD file which can be renamed to .HDA.
I've always thought it would be great if there was a vintage computing meetup here in Tasmania that could have Australians from everywhere come down and take their machines like VCF, as I've found several Tasmanian-based Mac enthusiasts on here and in the wild.
Do you own any other vintage Macs?
Lonnie is ok, it has everything I need, yes been looking for more broken Macs. I had the original iMac Bondi Blue, which I though I had stored under my house but can't find it anywhere, raised on Apple II's and remember them being tossed out at school , I have my old Floppies and the disk II drive. I still have my Apple G5 tower but not quite vintage, so yeah no others but now on the hunt!!
I saw that disk image (MacPack) and had downloaded, so do only have rename it, drop it on the SD card and thats it ? I was reading you had to use an emulator or such to produce the image?
Yes a meet up would be cool, I do the same for pinball machines and now have friends all around Australia from that hobby!
, I have my old Floppies and the disk II drive. I still have my Apple G5 tower but not quite vintage, so yeah no others but now on the hunt!!I saw that disk image (MacPack) and had downloaded, so do only have rename it, drop it on the SD card and thats it ? I was reading you had to use an emulator or such to produce the image?
Yes a meet up would be cool, I do the same for pinball machines and now have friends all around Australia from that hobby!
Oh yeah the cosmetic work is just the clean and retrobrite, the keyboard was way yellow than the MAC and now it's the opposite so going to retrobrite the case, tried to quiet the fan with the sewing machine oil but it is still loud, so have a fan on order will post results.
Just hanging to play some dark castle again been too long...
Just hanging to play some dark castle again been too long...
