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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Repairs & Servicing for Atari & Amiga machines (and any other retro computers) Located in the West Midlands UK. PM me if you require assistance.
www.solidstatesociety.co.uk

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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
fininished_wrapped.jpg (410.49 KiB) Viewed 151 times
Customer will hopefully leave a review. Just wanted to illustrate the extra care I take when doing a basic re-cap service for customers
Repairs & Servicing for Atari & Amiga machines (and any other retro computers) Located in the West Midlands UK. PM me if you require assistance.
www.solidstatesociety.co.uk

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.
Repairs & Servicing for Atari & Amiga machines (and any other retro computers) Located in the West Midlands UK. PM me if you require assistance.
www.solidstatesociety.co.uk

Pjeff18
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Joined: Mon Jan 28, 2019 9:36 am

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 👍🏻

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