Author Topic: 12V to keyboard  (Read 835 times)

0 Members and 1 Guest are viewing this topic.

Offline Fran123

  • CPC664
  • ***
  • Posts: 60
  • Country: es
  • Liked: 11
  • Likes Given: 0
12V to keyboard
« on: 23:29, 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

Offline eto

  • Supporter
  • 464 Plus
  • *
  • Posts: 431
  • Country: de
  • Liked: 272
  • Likes Given: 243
Re: 12V to keyboard
« Reply #1 on: 23:43, 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:

Code: [Select]
https://www.youtube.com/watch?v=3gX1cnZR6nM

Offline tjohnson

  • Supporter
  • 6128 Plus
  • *
  • Posts: 1.014
  • Country: gb
    • index.php?action=treasury
  • Liked: 326
  • Likes Given: 291
Re: 12V to keyboard
« Reply #2 on: 15:45, 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.

Offline Fran123

  • CPC664
  • ***
  • Posts: 60
  • Country: es
  • Liked: 11
  • Likes Given: 0
Re: 12V to keyboard
« Reply #3 on: 15:17, 22 June 21 »
Then, have I to cut the cables and cross them??
now:   red/black ======= red/black
then:  red/black ===x=== black/red

Offline Bryce

  • The Hardware Guy.
  • Supporter
  • 6128 Plus
  • *
  • Posts: 12.442
  • Country: wf
  • It's not broken, it just hasn't been fixed yet.
    • index.php?action=treasury
  • Liked: 4712
  • Likes Given: 488
Re: 12V to keyboard
« Reply #4 on: 15:42, 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.

Offline Fran123

  • CPC664
  • ***
  • Posts: 60
  • Country: es
  • Liked: 11
  • Likes Given: 0
Re: 12V to keyboard
« Reply #5 on: 21:26, 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.

Offline Bryce

  • The Hardware Guy.
  • Supporter
  • 6128 Plus
  • *
  • Posts: 12.442
  • Country: wf
  • It's not broken, it just hasn't been fixed yet.
    • index.php?action=treasury
  • Liked: 4712
  • Likes Given: 488
Re: 12V to keyboard
« Reply #6 on: 21:39, 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.

Offline eto

  • Supporter
  • 464 Plus
  • *
  • Posts: 431
  • Country: de
  • Liked: 272
  • Likes Given: 243
Re: 12V to keyboard
« Reply #7 on: 00:50, 23 June 21 »
It seem so, it's normal adaptor.

The polarity is usually printed on the case of the power supply: