I measured the CN1 on the powwer supply board.
PIN 6 should be 5V OK
PIN 3 should be -5V OK
PIN 4 should be 5V OK
PIN 5 should be GND OK
PIN 12 should be 5V OK
PIN 16 should be 6V Not OK (-0,1 / -0,2V)
PIN 18 should be 9V OK Not OK (6,7V)
I measured with a simple cheap multimeter between GND
Thanks Steve,
Tried cliping it out - same issue. Just black screenÂ
(screen full of black pixels)
Tried replace the ROM Chip - same.
Will try to replace the cap.
Thanks
On Fri, 2021-10-22 at 09:32 -0400, Stephen Adolph wrote:
> can you just clip it out and carry on?
>
> On Fri, Oct 22, 2021
Thanks Josh!
On Friday, 22 October 2021, Josh Malone wrote:
> Sorry - keyboard spazzed and sent mail too soon
>
> '104' should indicate a 0.1uF capacitor similar to this:
>
> https://www.jameco.com/z/DC-1-25-Jameco-Valuepro-Capacitor-Ceramic-Disc-0-1-micro-F-25V-plusmn-20-37-_151116.html
>
>
...@bitchin100.com
Subject: Re: [M100] NEC PC-8201 Replacement for 16X 104M Green capacitor
I measured the CN1 on the powwer supply board.
PIN 6 should be 5V OK
PIN 3 should be -5V OK
PIN 4 should be 5V OK
PIN 5 should be GND OK
PIN 12 should be 5V OK
PIN 16 should be 6V Not OK (-0,1 / -0,2V) PIN 18
Pawel,
Black screen usually indicates a deeper problem than a cap.
+5V good?
-5V good?
activity on the CLK signal at the processor?
check that data and address are toggling @ the main ROM and RAM sockets?
pull and reseat ROM and RAM modules?
just a few suggestions.
Do you have something like a
It's unlikely that the missing capacitor would cause a no-boot fault
that occurs 100% of the time. These capacitors are designed to provide
a path to ground for the switching noise coming from the adjacent
logic chips. This is good design, but very often not strictly
necessary; I would expect your
Sorry - keyboard spazzed and sent mail too soon
'104' should indicate a 0.1uF capacitor similar to this:
https://www.jameco.com/z/DC-1-25-Jameco-Valuepro-Capacitor-Ceramic-Disc-0-1-micro-F-25V-plusmn-20-37-_151116.html
DC voltage rating of ~10v or higher should be fine (these are
filtering the
104 should indicate a 0.1uF capacitor, similar to this:
On Fri, Oct 22, 2021 at 9:10 AM ExPLIT | Pawel Radomychelski
wrote:
>
> Hello collegues!
>
> I bought another "non-working" NEC PC-8201 (Japansese Model).
> Found out that one green capacitor 16X 104M is broken.
> Now i am looking for the
can you just clip it out and carry on?
On Fri, Oct 22, 2021 at 9:10 AM ExPLIT | Pawel Radomychelski <
exp...@mailbox.org> wrote:
> Hello collegues!
>
> I bought another "non-working" NEC PC-8201 (Japansese Model).
> Found out that one green capacitor 16X 104M is broken.
> Now i am looking for
