Title: 12V to keyboard
Post by: Fran123 on 21:29, 20 June 21
Post by: Fran123 on 21:29, 20 June 21
Hello
I have a CPC6128
I have replaced my green monitor (GT65), I bought the GBS8200 card and I have connected to lcd monitor. The keyboard is powered with 5V/3A adaptor.
Also, I have plugged the 12V connector to other adaptor (12V/1A) but the drive does not work. I have a cable with two female connectors, and it is connected to monitor and adaptor.
What's happening?
Thank you
I have a CPC6128
I have replaced my green monitor (GT65), I bought the GBS8200 card and I have connected to lcd monitor. The keyboard is powered with 5V/3A adaptor.
Also, I have plugged the 12V connector to other adaptor (12V/1A) but the drive does not work. I have a cable with two female connectors, and it is connected to monitor and adaptor.
What's happening?
Thank you
Title: Re: 12V to keyboard
Post by: eto on 21:43, 20 June 21
Post by: eto on 21:43, 20 June 21
Did it work before you connected the 12V adapter?
- make sure that the 12V has ground on the inside and 12V on the outside (see here: https://www.cpcwiki.eu/index.php/Power_Supply_for_CPC_and_CPC_plus)
- check if the drive belt inside the floppy is still there, replace if it is broken (almost all belts are broken after that many years). Check the guides on youtube, e.g. this one:
- make sure that the 12V has ground on the inside and 12V on the outside (see here: https://www.cpcwiki.eu/index.php/Power_Supply_for_CPC_and_CPC_plus)
- check if the drive belt inside the floppy is still there, replace if it is broken (almost all belts are broken after that many years). Check the guides on youtube, e.g. this one:
Code Select
https://www.youtube.com/watch?v=3gX1cnZR6nM
Title: Re: 12V to keyboard
Post by: tjohnson on 13:45, 21 June 21
Post by: tjohnson on 13:45, 21 June 21
Oh I hope you check the polarity on the 12v before you connected it, almost all modern external PSU are centre positive but the Amstrad 6128 requires centre negative.
Title: Re: 12V to keyboard
Post by: Fran123 on 13:17, 22 June 21
Post by: Fran123 on 13:17, 22 June 21
Then, have I to cut the cables and cross them??
now: red/black ======= red/black
then: red/black ===x=== black/red
now: red/black ======= red/black
then: red/black ===x=== black/red
Title: Re: 12V to keyboard
Post by: Bryce on 13:42, 22 June 21
Post by: Bryce on 13:42, 22 June 21
Quote from: Fran123 on 13:17, 22 June 21
Then, have I to cut the cables and cross them??
now: red/black ======= red/black
then: red/black ===x=== black/red
If the polarity is wrong at the moment yes. But do you know whether the polarity is wrong?
Bryce.
Title: Re: 12V to keyboard
Post by: Fran123 on 19:26, 22 June 21
Post by: Fran123 on 19:26, 22 June 21
Quote from: Bryce on 13:42, 22 June 21
If the polarity is wrong at the moment yes. But do you know whether the polarity is wrong?
Bryce.
It seem so, it's normal adaptor.
Title: Re: 12V to keyboard
Post by: Bryce on 19:39, 22 June 21
Post by: Bryce on 19:39, 22 June 21
There's no such thing as "normal" or standard in this case. Consumer devices usually have the minus pole on the outside, but medical equipment PSU's usually have plus on the outside. Depending on what the PSU was originally produced for decides which way around the poles are.
Bryce.
Bryce.
Title: Re: 12V to keyboard
Post by: eto on 22:50, 22 June 21
Post by: eto on 22:50, 22 June 21
Quote from: Fran123 on 19:26, 22 June 21It seem so, it's normal adaptor.
The polarity is usually printed on the case of the power supply:
