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AuthorTopic: Amiga 4000 restoration  (Read 327 times)

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Offline Zylark

Amiga 4000 restoration
« on: May 03, 2016, 11:39:22 PM »
My trusty old Amiga 4000/040 have been sitting idle for far too long. 13-14 years at least. Before it got decommissioned in favour of a Windows box, it was not all that reliable either. After a while of being powered on, it started to go slow and then freeze outright. So at the very least it got a heating issue.

This can be remedied by cooling down the CPU some more I assume, and luckily I got plenty of CPU cooler fans lying about. So that should be a simple fix.

A bit more serious is that the old battery have leaked...



(picture in full size here)

It's not spread too far though, and the corrosion isn't terribly bad as these things go. What is affected is the 10k resistor network SIP8 package, the HCT174A flip-flop chip and four of the eight 4.7k SMD resistors. Two of the pins on the rightmost HCT166M shift register chip is a bit dull as well.

Parts are ordered, and whilst at it I went ahead and ordered new caps for the motherboard and the CPU board. And a couple of other bits, like a coin-cell battery replacement and a 4 gig CF card 'Hard Disk' replacement.

It'll be a while until I got all my ducks in a row and can get it all fixed. But that is fine. It'll give me time to go over the rest of the machine with a keen eye out for potential problems.

First on the agenda is having a good look at (and test of) the PSU. I suspect that may need a recap job as well. The floppy-drive will need an inspection. Last but not least, the front plastic cover is now more brown than off-white, so it'll need some treatment.

Plenty to do in other words. Will update as the project snails along over the following weeks.
« Last Edit: May 03, 2016, 11:42:25 PM by Zylark »
 

Offline Oldsmobile_Mike

Re: Amiga 4000 restoration
« Reply #1 on: May 03, 2016, 11:51:39 PM »
While you're doing all that other work, flip the PSU fan around the other way so it pulls hot air out of the case, instead of blowing it into the case.  Another C= cock-up, there's lots of threads on here about this already.  ;)

Edit:  Also, good luck, and welcome to the forum!  :)
Amiga 500: 2MB Chip|16MB Fast|30MHz 68030+68882|3.9|Indivision ECS|GVP A500HD+|Mechware card reader + 8GB CF|Cocolino|SCSI DVD-RAM
Amiga 2000: 2MB Chip|136MB Fast|50MHz 68060|3.9|Indivision ECS + GVP Spectrum|Mechware card reader + 8GB CF|AD516|X-Surf 100|RapidRoad|Cocolino|SCSI CD-RW
 Amiga videos and other misc. stuff at https://www.youtube.com/CompTechMike/videos
 

Offline Zylark

Re: Amiga 4000 restoration
« Reply #2 on: May 04, 2016, 12:19:18 AM »
Why thank you.

I've been doing a bit of research lately, and heard it mentioned in some YouTube video or other that CBM (or rather their PSU supplier) did not always pay attention to little details like what direction the fan got installed. So yes, I'll be sure to check that out. I'll probably replace the fan alltogether, and add a couple of potentiometers to control the PSU fan and the to be installed CPU fan. The 5 1/4" drive bay face-plate is a nice place to mount those, and perhaps also a few LEDs for the bling factor. Hmmm, maybe an Arduino powered little LCD to report fan speed and temperature?

Anyhow. Fix first, bling later :)
 

Offline F1Lupo

Re: Amiga 4000 restoration
« Reply #3 on: May 04, 2016, 01:09:52 AM »
@ Zylark

welcome back to Amiga land:)

Obviously 1st thing is to remove that old leaky Ni-Cd battery and check for any damaged MB traces.  You can find nice little coin type battery holders that will operate the clock without any worries (Amigakit sells them else you can find them at most electronic stores).
2nd I strongly recommend you replace all the MB caps and PSU caps as thats a very common problem in miggies today especially if its been sitting for a long time.  As Mike mentioned check the PSU fan and make sure the fan is blowing to the rear of the PSU (pushing air out-search here as I know there's a recent thread about sizes, types) and since you're there I would highly recommend you repalce the PSU fan to reduce the noise and increase the CFM (trust me don't get lazy on this and do it & thank me later:rtfm:).
For the yellowing of the case, look up RetroBrite.  It works.

Have fun restoring :)

ah found the psu fan thread here: http://www.amiga.org/forums/showthread.php?t=55070&highlight=amiga+4000
« Last Edit: May 04, 2016, 01:13:16 AM by klx300r »
____________________________________________________________________
c64-dual sids, A1000, A1200-060@50, A4000-CSMKIII
Indivision AGA & Catweasel MK4+= Amazing
! My Master Miggies-Amiga 1000 & AmigaOne X1000 !
--- www.mancave-ramblings.blogspot.ca ---
  -AspireOS.com & Amikit- Amiga for your netbook-
***X1000- I BELIEVE *** :angel:
 

Offline jagoche

Re: Amiga 4000 restoration
« Reply #4 on: May 04, 2016, 03:13:08 AM »
@klx300r
I also need to replace CPU and MB caps soon on my A4000D.

Is there any reliable service in Europe doing this instead of me that you can recommend?
A2000, Blizzard 2040ERC, Spectrum (alive again), Masoboshi MC702
A4000, A3640, VLab, A2301
 

Offline F1Lupo

Re: Amiga 4000 restoration
« Reply #5 on: May 04, 2016, 03:23:18 AM »
Quote from: jagoche;807918
@klx300r
I also need to replace CPU and MB caps soon on my A4000D.

Is there any reliable service in Europe doing this instead of me that you can recommend?

I know Amigakit replace caps but not sure if there's anyone else closer to you?
For those in the US & Canada I used Charles at http://maccaps.com/MacCaps/Repair_Service.html.  Great quality work and fair pricing.
____________________________________________________________________
c64-dual sids, A1000, A1200-060@50, A4000-CSMKIII
Indivision AGA & Catweasel MK4+= Amazing
! My Master Miggies-Amiga 1000 & AmigaOne X1000 !
--- www.mancave-ramblings.blogspot.ca ---
  -AspireOS.com & Amikit- Amiga for your netbook-
***X1000- I BELIEVE *** :angel:
 

Offline QuikSanz

Re: Amiga 4000 restoration
« Reply #6 on: May 04, 2016, 05:44:49 AM »
Quote from: jagoche;807918
@klx300r
I also need to replace CPU and MB caps soon on my A4000D.

Is there any reliable service in Europe doing this instead of me that you can recommend?


Hmm, S. Korea is closer to OZ. Isn't there a chap in Oz that works on Miggy's part time of the year?
 

Offline zipper

Re: Amiga 4000 restoration
« Reply #7 on: May 04, 2016, 09:10:36 AM »
 

Offline jagoche

Re: Amiga 4000 restoration
« Reply #8 on: May 05, 2016, 02:56:57 PM »
Quote from: zipper;807923
Castellen, http://www.amiga.org/forums/member.php?u=191


His webpage says he moved for work to Antarctica! No Amiga business until he's back.

Europe works better for me in terms of shipping anyway. Other suggestions for caps replacement service in Europe appreciated...
A2000, Blizzard 2040ERC, Spectrum (alive again), Masoboshi MC702
A4000, A3640, VLab, A2301
 

Offline zipper

Re: Amiga 4000 restoration
« Reply #9 on: May 05, 2016, 03:18:22 PM »
 

Offline F1Lupo

Re: Amiga 4000 restoration
« Reply #10 on: May 05, 2016, 04:59:37 PM »
Quote from: zipper;807969
http://eab.abime.net/showthread.php?t=81395

thanks for the link! I actually live so close to a guy that does cap/smt repairs :)
____________________________________________________________________
c64-dual sids, A1000, A1200-060@50, A4000-CSMKIII
Indivision AGA & Catweasel MK4+= Amazing
! My Master Miggies-Amiga 1000 & AmigaOne X1000 !
--- www.mancave-ramblings.blogspot.ca ---
  -AspireOS.com & Amikit- Amiga for your netbook-
***X1000- I BELIEVE *** :angel:
 

Offline Zylark

Re: Amiga 4000 restoration
« Reply #11 on: May 07, 2016, 04:43:02 PM »
Anyone by chance got the pin-outs for the PSU? The 4-Pin molex connectors shouldn't be a problem - though the color-coding of the wires isn't even close to standard. The MB connector however...

Expecting the first batch of parts to trickle in during the coming week, so I thought testing the PSU should be first order of business. Just in case that'll  need some work as well.

I could go with a new PSU, but I want to keep it all original. It's not like if I'm going to stuff the machine full of peripherals that draw a lot of power, so the original will do just fine. All I'm going for is to get the machine up to original condition. Perhaps invest in a Scandoubler at some time, but then I'll also need to replace the Buster to get it up to v11. Though I'm not new to SMD soldering, replacing a chip of that size would be new territory for me.
 

Offline magnetic

Re: Amiga 4000 restoration
« Reply #12 on: May 08, 2016, 04:09:11 AM »
zylark
You dont need a buster 11 to use a scandoubler???
bPlan Pegasos2 G4@1ghz
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Amiga 2000 Rom Switcher w/ 3.1 + 1.3 | HardFrame SCSI | CBM Ram board| A Squared LIVE! 2000 | Vlab Motion | Firecracker 24 gfx

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Offline Zylark

Re: Amiga 4000 restoration
« Reply #13 on: May 08, 2016, 10:27:15 AM »
It's a Zorro slot card right? As I've understood it, in a 4000 the non v11 Busters have some issues with expansion cards.

Anyway, I and my assistant will research further.



Paws here have promised to supervise my restoration :)
 

Offline mechy

Re: Amiga 4000 restoration
« Reply #14 on: May 09, 2016, 02:56:34 AM »
Quote from: Zylark;808091
It's a Zorro slot card right? As I've understood it, in a 4000 the non v11 Busters have some issues with expansion cards.

Anyway, I and my assistant will research further.



Paws here have promised to supervise my restoration :)

scan doubler goes in the video slot, buster doesn't affect it but the indivisions clip on top of the alice chip.Many old z3 cards would work on  buster9(which supported multiple bus masters),depending on the card, but its best to run buster 11 for the most part.

the a4000 psu pinout can be found here: http://www.ianstedman.co.uk/Amiga/amiga_hacks/Amiga_Power_supplies/body_amiga_power_supplies.html#Fitting_a_new_PSU_to_an_A4000

the molex connector is actually 6 pin.