I renewed my PSU last week. Look here: http://www.keprt.cz/sam/psu.php
Although I think 12 Volt line is not used for actual scart output, bad
el.capacitors can of course cause almost any kind of evil in electronic devices.
Aley
From: Leszek Chmielewski
Sent: Tuesday, January 24, 2012 7:23 PM
To: sam-users@nvg.ntnu.no
Subject: Re: Drive/SCART fault?
Okay, thats strange. I Overreaded the good RF signals... Video signal for RF is
made from RGB signals by MC 1377P chip, but Scart has some additional signals
and supplies ölike +12V for switching to RGB. Maybe the +12V are too weak.
Please check the voltage of +12Volt. Check also the condensators in PSU and SAM.
LCD
Am 24.01.2012 19:13, schrieb Aleš Keprt:
If you use the original floppy drive and have got power problems, you can
simply call an electrician to repair your original power supply. You don’t need
to replace it. Every normally skilled repair man will repair it.
I just wonder how it is possible to see problems on scart caused by power
supply problems, and have RF image good at the same time.
From: Andrew Gillen
Sent: Tuesday, January 24, 2012 6:44 PM
To: sam-users@nvg.ntnu.no
Subject: Re: Drive/SCART fault?
Hi LCD
Thanks, that's good to know it is just a PSU fault. The drive is the original
drive that shipped with the SAM back in '91.
Is this something I should approach Quazar with, or is it something that can
be resolved easily by someone as inept as me with electronics? I'd like to keep
the original SAM supply really for aesthetic value.
Cheers
Andrew
From: Leszek Chmielewski
Sent: Tuesday, January 24, 2012 12:21 AM
To: sam-users@nvg.ntnu.no
Subject: Re: Drive/SCART fault?
Am 24.01.2012 01:01, schrieb Andrew Gillen:
Anyone experienced any issues whereby accessing the floppy drive causes the
display to corrupt? It starts off with the left hand side phasing off in jagged
lines, then eventually the entire screen goes blank. When the drive has been
shut off the display returns. This only effects the video signal from the scart
socket - RF works absolutely fine.
Cheers
Andrew
Sure, the PSU supples not enough ampere or the drive (replaced?) consumes too
much. I had similar issue with replacement drive, and after building new PSU
all works fine.
Cheers
LCD
