Amiga 1200 service blog (accel stability)

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Steve
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Amiga 1200 service blog (accel stability)

Post by Steve » Mon Apr 05, 2021 2:20 pm

Hi all,

Here is an Amiga 1200 that was sent to me for a re-cap due to instability issues when using the ACA1233n accelerator. In this blog we re-cap the motherboard, remove two ceramic capacitors on the rear and perform a general tidy up.

Photos before service:

motherboard_original_overview.jpg
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top_left_corner_overview.jpg
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middle_overview.jpg
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Capacitors on top of board replacement, many had leaked and emitted a very strong fishy smell:

top_left_caps_removed.jpg
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top_left_caps_new.jpg
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middle_caps_removed.jpg
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middle_caps_replaced.jpg
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back_caps_replaced.jpg
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Rear capacitors needed to be removed as per aca1233n wiki, link: http://wiki.icomp.de/wiki/ACA1233n#poss ... ifications
rear_caps.jpg
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rear_caps_removed1.jpg
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Rust on case and shielding removed with sand paper, case cleaning in the sink:
shielding_rust1.jpg
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shielding_rust2.jpg
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base_case_rust.jpg
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rust_removed1.jpg
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rust_removed2.jpg
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sink_wash_case.jpg
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case_clean.jpg
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Put back together and finishing touches, HDD cable was very long so removed and replaced with new smaller cable, rear of cf adaptor covered with kapton tape and secured with velcro:

new_velcro_under.jpg
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new_velcro_top.jpg
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Steve
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Re: Amiga 1200 service blog (accel stability)

Post by Steve » Mon Apr 05, 2021 2:22 pm

Keyboard cleaned and everything wrapped up:
vacuum_keyb.jpg
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finished.jpg
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fininished_wrapped.jpg
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Customer will hopefully leave a review. Just wanted to illustrate the extra care I take when doing a basic re-cap service for customers

Maximilian
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Re: Amiga 1200 service blog (accel stability)

Post by Maximilian » Mon Apr 05, 2021 3:24 pm

Hello Steve,

Thanks for sharing :)

Did you replace the two capacitors near the audio jacks?
And did you remove the keyboard connector to do so?

Thanks!

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Steve
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Re: Amiga 1200 service blog (accel stability)

Post by Steve » Mon Apr 05, 2021 3:31 pm

Yes they were replaced too, I didn't need to remove the keyboard connector as I have a very fine soldering tip which fits between ok. Got to be very careful with a1200 mobos as the pads are very delicate.

Pjeff18
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Re: Amiga 1200 service blog (accel stability)

Post by Pjeff18 » Tue Apr 06, 2021 9:52 pm

Great write up Steve!

For those reading this blog I can’t wait to receive my A1200 back. When I do I will write a mini review here but in the meantime I must say that Steve is highly competent and something that sets him apart from other gurus is his superb communication. Every step of the way he kept me informed, from the moment the Amiga arrived to the final cleaning process. I will now get it collected and get back to hopefully playing my classics .

Review to follow 👍🏻

Pjeff18
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Re: Amiga 1200 service blog (accel stability)

Post by Pjeff18 » Thu Apr 29, 2021 10:12 am

Just an update following many hours of use. I forgot just how good Speedball 2 was!

The A1200 is super stable and running like a dream, I cannot thank Steve enough for his work and attention to detail.

If you want your Amiga recapped, Steve provide a cost effective yet first class service. He will keep you informed every step of the way. Would highly recommend.

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rubber_jonnie
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Re: Amiga 1200 service blog (accel stability)

Post by rubber_jonnie » Thu Apr 29, 2021 10:22 am

@Pjeff18 FYI I deleted your post that had the text 'Test' in it. I presume this was because you hadn't seen your previous test appear. This is simply because your posts still need approval.

Once you've posted enough, your posts will no longer require approval.
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
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Steve
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Re: Amiga 1200 service blog (accel stability)

Post by Steve » Thu Apr 29, 2021 10:43 am

@Pjeff18 Really glad it all fixed the instability issues, now your a1200 will last another 30 years :) Thanks for the review!

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HigashiJun
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Re: Amiga 1200 service blog (accel stability)

Post by HigashiJun » Thu Apr 29, 2021 12:40 pm

Nice and clean job Steve !

I really like when people take care of their (or others') retro stuff.

Never thought I will post an Amiga related topic on Exxos forum, but just the once will not hurt...

Here is a picture of my own Amiga 1200 (NTSC):

Amiga1200.jpeg
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The following have been done to enhance the beast:

- Full polymer recap
- Timing fixes
- Indivision AGA MK3
- 4-way Clockport Expander
- Elbox FastATA A1200 MK-V
- RapidRoad (double USB)
- ACA1233n@55Mhz and 55Mhz FPU
- 32GB SSD
- 3.9 Kickstart ROMS
- Chinon FZ-357A
- New A1200.NET case

Everything is rock solid and runs perfectly under Amiga OS 3.9.

I am still waiting for the new A1200.NET keycaps to arrive and to get a 68060 based accelerator board, such as Terriblefire's TF1260 (my MC68060 would be grateful). :D

Cheers.

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HigashiJun
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Re: Amiga 1200 service blog (accel stability)

Post by HigashiJun » Thu Apr 29, 2021 12:53 pm

and forgot to mention the RTC...

:oops:

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