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Offline blanghorstTopic starter

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Recapping questions
« on: February 15, 2017, 03:03:56 PM »
So, I think I've decided to bring my Amigas back to life and play with them, so I'll probably be asking lots of questions. The last time I was here, I had just acquired an Amiga 3000 and a SCSI card reader, which I never quite got working. My Amiga 2000 startup sequence doesn't seem to work quite like I want, so I'll probably eventually post questions about that - I have one of those ROM switchers (DKB?) with a 1.3 ROM and 2.0 ROM and the startup sequence is supposed to detect the currently selected ROM and load the correct WB. For whatever reason, it doesn't seem to work any longer - I suppose that my ROM switcher could be dead.

HOWEVER, the first thing I want to consider is having my systems recapped. Who do you guys recommend for that? Here is some of the work I'd like to have done:

1. Amiga 2000 rev 6.x motherboard - recap
2. Amiga 2000 rev 4.3 motherboard - recap, cleaned, and replace CPU socket. This was my original A2000 board and was damaged by a battery leak. I figure if I could get if fixed, I'll have a backup OR I could slowly start building another A2000.
3. Amiga 3000 board - recap
4. Does anyone recap boards? I have an A2091, a GVP 3001 68030 CPU board, and a Microway FlickerFixer I'd like to get recapped at some point.
5. Power supplies - do you guys get those recapped as well?

Thanks
« Last Edit: February 15, 2017, 03:38:24 PM by blanghorst »
Amiga 2000 | GVP 68030 w/ 8 MB RAM | A2091 w/ 52 MB hard drive | Dual floppy drives
 
Amiga 3000 | 68030 @ 25 Mhz | 18 MB RAM | 3.2 GB SCSI hard drive
 
Vic 20 w/C2N datassette (trying to find it!)
C-64 w/ 1541 drive
C-128 w/ 1571 drive
 

Offline polyp2000

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Re: Recapping questions
« Reply #1 on: February 15, 2017, 03:32:28 PM »
Quote from: blanghorst;822218
So, I think I've decided to bring my Amigas back to life and play with them, so I'll probably be asking lots of questions. The last time I was here, I had just acquired an Amiga 3000 and a SCSI card reader, which I never quite got working. My Amiga 2000 startup sequence doesn't seem to work quite like I want, so I'll probably eventually post questions about that - I have one of those ROM switchers (DKB?) with a 1.3 ROM and 2.0 ROM and the startup sequence is supposed to detect the currently selected ROM and load the correct WB. For whatever reason, it doesn't seem to work any longer - I suppose that my ROM switcher could be dead.

HOWEVER, the first thing I want to consider if having my systems recapped. Who do you guys recommend for that? Here is some of the work I'd like to have done:

1. Amiga 2000 rev 6.x motherboard - recap
2. Amiga 2000 rev 4.3 motherboard - recap, cleaned, and replace CPU socket.  This was my original A2000 board and was damaged by a battery leak.  I figure if I could get if fixed, I'll have a backup OR I could slowly start building another A2000.
3. Amiga 3000 board - recap
4. Does anyone recap boards? I have an A2091, a GVP 3001 68030 CPU board, and a Microway FlickerFixer I'd like to get recapped at some point.
5. Power supplies - do you guys get those recapped as well?

Thanks


My next job is to attempt recap my A1200  so i will be watching this thread ...

Offline midway

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Re: Recapping questions
« Reply #2 on: February 15, 2017, 03:56:48 PM »
The 2000s (as the 3000) are notorious for battery leak damage.
 
 I heard good things about Acill, who is on his forum as well.
 
 the 2000 caps leak less likely than the defective SMD caps used in the 4000 and 1200, some also in the 3000.
 
 PSU recap is a great idea, ask Acill if he does that too.
 
 A quick question for the electronic engineers among this crowd:
 
 Some germans seem to love replacing the electrolytic caps with ceramic ones, any problems with that ? Other than microfractures from bending/soldering ? I certainly wouldnt want tantalum caps, they make a mess when they are goners....
 

Offline blanghorstTopic starter

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Re: Recapping questions
« Reply #3 on: February 15, 2017, 04:15:08 PM »
Quote from: midway;822220
The 2000s (as the 3000) are notorious for battery leak damage.

I heard good things about Acill, who is on his forum as well.

the 2000 caps leak less likely than the defective SMD caps used in the 4000 and 1200, some also in the 3000.

PSU recap is a great idea, ask Acill if he does that too.

A quick question for the electronic engineers among this crowd:

Some germans seem to love replacing the electrolytic caps with ceramic ones, any problems with that ? Other than microfractures from bending/soldering ? I certainly wouldnt want tantalum caps, they make a mess when they are goners....

Yeah, I replaced the batteries on my A3000 and the new A2000 board when I acquired them. My old board was in my Amiga and sitting in my garage for 20+ years and by the time I pulled it out, it was too late.

I am an Electrical Engineer, but I'm too busy and lazy to recap the boards myself especially when the prices I've seen are under $100 per machine.

Thinking about my original post and the issue with the startup sequence and DKB ROM switcher, I bet something is up with the ROM switcher. When I installed the GVP board, the machine wouldn't boot and I found out was the reason was that there was a resistor soldered across one of the sockets that had to be snipped for the accelerator to work. I wonder if that broke the switcher - it really shouldn't have, as I researched and found that solution, but it may have.  I seem to remember the startup script working fine back in the day.  Maybe I should just pull the accelerator or look for a new ROM switcher.
« Last Edit: February 15, 2017, 07:19:41 PM by blanghorst »
Amiga 2000 | GVP 68030 w/ 8 MB RAM | A2091 w/ 52 MB hard drive | Dual floppy drives
 
Amiga 3000 | 68030 @ 25 Mhz | 18 MB RAM | 3.2 GB SCSI hard drive
 
Vic 20 w/C2N datassette (trying to find it!)
C-64 w/ 1541 drive
C-128 w/ 1571 drive
 

Offline mindprober

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Re: Recapping questions
« Reply #4 on: February 15, 2017, 05:15:05 PM »
ACILL has an affordable recapping service.  :)
 

Offline desantii

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Re: Recapping questions
« Reply #5 on: February 15, 2017, 05:58:04 PM »
Acill all the way! great service and actually knows the systems
Amiga 1200/030 50mhz, 64mb ram

Amiga 2000, 030 25mhz, 7mb ram, A2320,  SCSI2CD
 
Amiga 3000/030 25mhz, CF SCSI card

Amiga 4000/ 040 33mhz 274mb ram
 

Offline Iggy

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Re: Recapping questions
« Reply #6 on: February 15, 2017, 06:14:13 PM »
Quote from: blanghorst;822218
So, I think I've decided to bring my Amigas back to life and play with them, so I'll probably be asking lots of questions. The last time I was here, I had just acquired an Amiga 3000 and a SCSI card reader, which I never quite got working. My Amiga 2000 startup sequence doesn't seem to work quite like I want, so I'll probably eventually post questions about that - I have one of those ROM switchers (DKB?) with a 1.3 ROM and 2.0 ROM and the startup sequence is supposed to detect the currently selected ROM and load the correct WB. For whatever reason, it doesn't seem to work any longer - I suppose that my ROM switcher could be dead.

HOWEVER, the first thing I want to consider is having my systems recapped. Who do you guys recommend for that? Here is some of the work I'd like to have done:

1. Amiga 2000 rev 6.x motherboard - recap
2. Amiga 2000 rev 4.3 motherboard - recap, cleaned, and replace CPU socket. This was my original A2000 board and was damaged by a battery leak. I figure if I could get if fixed, I'll have a backup OR I could slowly start building another A2000.
3. Amiga 3000 board - recap
4. Does anyone recap boards? I have an A2091, a GVP 3001 68030 CPU board, and a Microway FlickerFixer I'd like to get recapped at some point.
5. Power supplies - do you guys get those recapped as well?

Thanks

Amiga 2000s do not really need recapping.
And with through hole caps, its actually a more expensive job than many other Amigas.
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Offline blanghorstTopic starter

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Re: Recapping questions
« Reply #7 on: February 15, 2017, 07:04:24 PM »
Quote from: Iggy;822227
Amiga 2000s do not really need recapping.
And with through hole caps, its actually a more expensive job than many other Amigas.

Why don't A2000s need recapping?  They have the older electrolytic caps, right?
Amiga 2000 | GVP 68030 w/ 8 MB RAM | A2091 w/ 52 MB hard drive | Dual floppy drives
 
Amiga 3000 | 68030 @ 25 Mhz | 18 MB RAM | 3.2 GB SCSI hard drive
 
Vic 20 w/C2N datassette (trying to find it!)
C-64 w/ 1541 drive
C-128 w/ 1571 drive
 

Offline paul1981

Re: Recapping questions
« Reply #8 on: February 15, 2017, 08:53:32 PM »
Quote from: blanghorst;822233
Why don't A2000s need recapping?  They have the older electrolytic caps, right?

They should last a heck of a lot longer than the SMD types in the A600/A4000/A1200/CD32 which at the time most were of poor quality. This is the same for other computers though too which used SMD caps which were built around that time. Most Amigas will need to be re-capped now as the risk of motherboard damage from leaking electrolyte is very real and likely happening right now on YOUR Amiga to some extent. Mind you, those models are 25 years old so it is excusable.
:laughing:

Basically, those SMD types were still fairly new tech at the time and apparently there were a few teething problems. :)
 

Offline Acill

Re: Recapping questions
« Reply #9 on: February 15, 2017, 11:32:03 PM »
Thanks for the recommendation guys. I can do all that,  and they are right  about the through hole recaps. Its not typically needed but only way to know is to remove a few random caps to test the capacitance. Cant do it in circuit. Shoot me a message and id be glad to give you a quote. Can even do it all ovee time if you like.

As far as why they dont need it is basicly they were top quality at the time, smd was newer stuff and well sucked at rhe time. All machines vuilt back then with smd need recaps now.
« Last Edit: February 15, 2017, 11:35:21 PM by Acill »
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Offline Whaka

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Re: Recapping questions
« Reply #10 on: February 15, 2017, 11:36:51 PM »
Quote from: midway;822220
 Some germans seem to love replacing the electrolytic caps with ceramic ones, any problems with that ? Other than microfractures from bending/soldering ? I certainly wouldnt want tantalum caps, they make a mess when they are goners....
i think they replace them with tantalum. ceramic are not polarized, and through hole ones work usually with low capacities. they can't replace polarized electrolytic in all case.

tantalum are really great nowdays. (and when i say nowdays, i think about something around 20 years now :D)
they maybe have been more problematic at their begin, as for first gen smd electrolytic... but nowdays they are "mastered", and are wildly spread.
« Last Edit: February 15, 2017, 11:43:59 PM by Whaka »
 

Offline Acill

Re: Recapping questions
« Reply #11 on: February 15, 2017, 11:45:51 PM »
Do not use  tantalum they explode if installed wro g an ceramic are just wrong. I use better than required hybrid polymers from Panasonic. They will never leak or fail in your lifetime.
Proud Retired Navy Chief!

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Offline Whaka

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Re: Recapping questions
« Reply #12 on: February 16, 2017, 12:01:31 AM »
tantalum can explode as electrolytic can too... they are wildly used now, and some amiga extension card use them for more than 20 years now without any problems (CV64 - 64/3D, blizzard, cyberstorm... for exemple)
tantalum is an old technology, late 70's early 80's...
 

Offline darkage

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Re: Recapping questions
« Reply #13 on: February 16, 2017, 12:42:43 AM »
Quote from: Acill;822247
I use better than required hybrid polymers from Panasonic. They will never leak or fail in your lifetime.


but may fail when your great great grand children get their hands on it :P
 

Offline Acill

Re: Recapping questions
« Reply #14 on: February 16, 2017, 02:19:24 AM »
Quote from: Whaka;822248
tantalum can explode as electrolytic can too... they are wildly used now, and some amiga extension card use them for more than 20 years now without any problems (CV64 - 64/3D, blizzard, cyberstorm... for exemple)
tantalum is an old technology, late 70's early 80's...


And they were designed with them. I refuse to not use the components the circuit was engineered to use. If you want better you use higher spec parts,  not different parts than intended.
Proud Retired Navy Chief!

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Powerbook G4 15", 17"
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Need Amiga recap or other services in the US? Visit my website at http://www.acill.com and take a look or on facebook at http://facebook.com/acillclassics