Re: Checking Omega Race voltages

On Mar 7, 9:52 pm, Paladin <web.questi...@xxxxxxxxxxx> wrote:
On Mar 6, 5:46 pm, Paladin <web.questi...@xxxxxxxxxxx> wrote:





On Mar 6, 9:30 am, Paladin <web.questi...@xxxxxxxxxxx> wrote:

On Mar 5, 9:38 am, Paladin <web.questi...@xxxxxxxxxxx> wrote:

On Feb 28, 5:54 am, Paladin <web.questi...@xxxxxxxxxxx> wrote:> Dumb question, but I'm still learning this stuff.  I have anOmegaRacethat's barely getting any power to the boards.  I've checked the
power going into the filter block, but am not sure where to put the
negative lead of the multimeter to check the power going out.  There
are 8 wires going from the filter to the linear power supply, and the
schematics show all 8 carry voltage.  Where the heck do I put the
other multimeter lead?  I'm used to connectors that have both power
and ground.

I looked at a Tron manual, and it seems that the MCR games are the
same up to the filter block - the linear supply is whereOmegaRace
differs with the oddball voltages.  I know it's something simple, but
I'd rather ask than short something.

Thanks!
Tom

I may have found my problem.  I had checked continuity on the wires
that carry power to the motherboard at the connector - not to the
board.  I should have known better!  I just checked the continuity
again and found that the 8v line to the motherboard was not making
contact with the actual pin on the board.  I took the connector off
and looked at the pins in the connector and a couple of them aren't
sticking out enough to make good contact with the pins on the board.
I pulled one pin out to see if I could bend it out to apply more
pressure, and it just about fell apart in my hand.  Looks like I need
to replace all the pins in the connector.

At least there are only 2 connectors with 8 pins in total.  I also
found that someone had already replaced one of the pins in the 3 pin
connector, as it's a nice clean copper connector as opposed to the
other corroded looking connectors.

Well, I fixed the bad connectors and now get 8 volts to the board -
but still no 5 volts.  I get less than 1 volt from each 5 volt lead.
I'm still confused about checking the large filter block.  I'm not
sure I'm using the correct ground, but later today I'll try each wire
and see what I get.  If I'm getting 8 volts out of the power board,
there must be some power going in!

I guess I could throw a switcher in for the 5 volts, but I'd rather
fix it right.  Any help on where the negative lead should go when
testing the filter block would be appreciated.  I came across a post
that stated where to put the multimeter leads on a Tron power supply
board to check voltages, but the Omega Race power board is a little
different and I don't know how to read schematics well.

Tom- Hide quoted text -

- Show quoted text -

I checked the voltages out of the filter caps, and only pins 4 and 6
were in spec.:
Pin     Voltage
2        -.02v
3        -.02v
4        9.72v
5        0v
6        16.68
7        -.02v
8        0v
9        -.02v

Any ideas?  I can't decipher the schematics to tell if the symptoms
indicate one bad cap, or both.  I tested this with all connectors to
the game board in place.  Should I test the voltages with the filter
cap connector disconnected from the linear supply?  Have I narrowed
the problem down to the filter caps, or could it still be something
else?

Is there anyone out there????

Tom- Hide quoted text -

- Show quoted text -

I pulled the connectors from the power supply, and checked the voltage
from out of the filter at the unplugged connector.  It looks like I
read pin 8 wrong above, as it now shows voltage - the wires are big
enough that I problably just didn't get the probe in there far enough
before.

This means I show voltage on pins 4, 6 and 8, all of which show as
"unreg" on the schematic.  The other pins show as "com".  Can anyone
tell me what it means if I'm getting the unregulated voltages but not
the others?  I'm leaning to one of the big filter caps being bad - but
I don't know how to read the schematics good enough to tell for sure.
I'll pull the filter block and double check that there are no loose
wires.

I think I'm getting close here, just wish I had a little help.

Tom- Hide quoted text -

- Show quoted text -

I should have clarified, the other pins on the connector show in the
manual as 5v "com", 8v "com" and 12v "com". I know that com usually
means a ground, so I don't know what com means when next to a voltage
rating. I know that these wires bring voltage to the motherboard, so
they can't be grounds.
.

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