BBC Micro power on - 1 beep and caps lock

discuss both original and modern hardware for the bbc micro/electron
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aod
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BBC Micro power on - 1 beep and caps lock

Post by aod »

I've spent some time on my first go at repairing a BBC Micro (B, possibly A), and devling into soldering as a novice!

I've replaced C1, C2 and C9 in the PSU, and replaced 2 power posts on the motherboard.

For the first time in probably 25-30 years, I've just turned it on!

To my (slight) suprise it showed signs of life, but as I don't have any visual output yet, I can't 100% confirm.

However - there does appear to be an issue - I don't get the normal 2 tone power on beep. Instead I get the single lower tone, just once - and it sounds a little phased. Also the caps lock light is on, but doesn't respond to pressing the key.

Any suggestions?
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JasonStonier
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Re: BBC Micro power on - 1 beep and caps lock

Post by JasonStonier »

Check you've not got an off-by-one error on your keyboard connector.

I had something like that symptom (IIRC) when I put the connector on one pin out of line.
aod
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Re: BBC Micro power on - 1 beep and caps lock

Post by aod »

JasonStonier wrote:
Thu Nov 19, 2020 5:05 pm
Check you've not got an off-by-one error on your keyboard connector.

I had something like that symptom (IIRC) when I put the connector on one pin out of line.
Thank you.

I just checked and it seemed ok, but re-seated it anyway.

At the same time I double checked all the power cables from the PSU were connected securley to the motherboard - and then of course another power tab/post came off as I did. :roll:

Guess i need to order some more and go again!
e668ecp
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Re: BBC Micro power on - 1 beep and caps lock

Post by e668ecp »

Swap the 6522's around
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