Mario Bros - No Power

[iankellogg]

Did you remove the hot before testing it? If you didn't you need to go back, remove it and retest.

[bfrosty]

Yes!

[VertexGuy]

It's broken.. that's whats wrong .

[bfrosty]

Funny!

[bfrosty]

Hey Vertex and John,

Finally got a new HOT on this Sanyo.

Picture comes up, but scrambled....color looks good, coins up, sound works great.

I can't get the screen to unscramble and the monitor goes off after about 30secs of power.

So, I checked the B+ and I'm hitting 127vDC.....I know it suppose to be 108vDC.

Tried adjusting the B POT....and it goes up to 137vDC....but when I turn it the opposite way I can only bring it down to about 126vDC.

There was some white glue...but it flaked away.

Is the B-POT bad?  Can it be replaced?  Is there something else I can check?

Thanks,
MK

[bfrosty]

Okay....

Looks like Q901 needs to be replaced.

Where is that?  Is it another Transistor?

Thanks,
Mitch

[bfrosty]

Found it....right next to the B+ pot.

[bfrosty]

Does anyone know the part # or item # for this transistor? It's got a screw hole in the top and 3-legs.  Guessing BCE.


Thanks,
Mitch

[VertexGuy]

I aint gonna lie, im not that good with ez20's
Never had one flake out on me so ive never had to trouble shoot one.

[iankellogg]

Does anyone know the part # or item # for this transistor? It's got a screw hole in the top and 3-legs.  Guessing BCE.


Thanks,
Mitch

2SD1090,  2SD931, or 2SC3153

[bfrosty]

Okay Ian - so any of those would work?

I'm gonna CAP kit it too while I have it all apart.

Already CAPPED the audio board....not bad...just took some time.

Thanks
MK

[bfrosty]

Good News -

Put all my Caps in, read the b+ and adjusted to 108vdc.

Adjusted H Hold...and....

BINGO!!! A great stable image of Mario Bros.  Sound works great too.


Played it for a couple hours and was rock solid.

Now, just need a new CPO and Sideart.  Also, the plastic t-mold has turned very brittle.
Anyone know of a good place online to pick all this up?

Thanks for everyone's help.  I greatly appreciate everyone here helping me out.
MK

[kkcloak]

Okay, try follow me here...

So, I thought, Humm...I will check all the fuses and test for continuity.  All 4 fuses checked out except for the .3A on the monitor.

9-Pin connector
Color      Spec    Actual Reading
Blue       +5       +5.22
Purple    +5       +5.22
Yellow    +12      +12
Green    +12      +12
Gray      -5.13     -5
White     +24      +23.58
Brown Ground
Red Ground
Orange Ground

10-Pin Connector
Color     Spec     Actual Reading
Brown    -5         -5.14
Red        -5         -5.13
Orange   -5         -5.14
Yellow    -5         -5.14
Green Ground
Blue Ground
Purple Ground
Gray Ground
White      +5        +5.22
Black       +5        +5.22

is there really 4 fuses, i know there one at the switch, one in the power supply and one on the monitor but where is number 4?

mine has been dead for 3 months now :p

edit: i have power at the monitor and marquee but no power to the pcb.