Super Sprint Monitor - No picutre.

[tommyinajar]

Hi - I just purchased a Super Sprint and I can turn it on hear the game start run- but no picture. I checked the fuses and the voltage going to the monitor from the transformer- seemed o.k. There is no glow , noise or anything from the monitor.

 It's got to be a 19" medium resolution monitor- but I can't see anything for labels or stickers on it except for the serial number "WG140959". It kind of looks like a 4900 from the pictures I've seen- but what's there is mirrored. Any help on identifying the monitor ?

Edit:
I looked some more- Might it be a WG K7000 by Zenith (Zenith tube) ??

[qrz]

for starters..,
check the h output xistor  (2sd1398) if shorted, it may have also taken out the Vreg ic ...
there is also a 47uF 160v cap on vreg out that fails.

qrz

[Kevin Mullins]

Edit:
I looked some more- Might it be a WG K7000 by Zenith (Zenith tube) ??

Nah, ignore what's on the tube. (Zenith)
Looks like a standard K7000 to me without a remote board. (onboard controls)
There should be a "Pxxx" number somewhere around the middle of the main chassis. (Like P538)

[tommyinajar]

Well in the middle of the chassis there is a "P447"-

The 1.5 A fuse was blown- I checked the center lead of Q11 (2SD1398) and  chassis ground- and the reading wasn't open but it was 15,000 ohms or so- does that mean it is probably ok ?

It looks like some one went through it once before. There was what I think was hot glue on c57 (.47uf) and other large caps.


Also the pins on the back of the tube look a little bent and the plastic around them crumbled apart- Is that going to cause more problems or there any was to fix that also ?

Toss a new fuse in it and see what happens ?

This is my 1st attempt at fixing a monitor... so patience is appreciated ! Thanks !

[FrizzleFried]

That is a K7000 medium res chassis.  They are a pain in the ass as they run VERY VERY hot.  There are a number of known suspect cold solder locations.   There is a guy named CHRIS over at KLOV that is pretty good with working on these chassis.  You need to re-cap and go over all the solder pads with a fine tooth comb.  I think i found 7 or 8 lifted traces on my Paperboy K7000 medium res chassis.  They're a pain in the ass as far as I am concerned.

[tommyinajar]

You can test the 2sd1398 without removing it right ?

The Collector & Emitter are open but it looks like the Emitter and Base are shorted. Try a new one and and IC4 while I'm at it  ?

Also any ideas about the plastic that crumbled on the tube- if it's a problem should I forget about the rest  ? Thanks

[qrz]

in circuit,  the EB junction WILL read as a short ( < 1ohm) while connected to the secondary winding on the driver xformer .  out of circuit , it may read 47 ohm +/-  ( if has an internal bias res )

hot is likely ok.

qrz

[FrizzleFried]

You can test the 2sd1398 without removing it right ?

The Collector & Emitter are open but it looks like the Emitter and Base are shorted. Try a new one and and IC4 while I'm at it  ?

Also any ideas about the plastic that crumbled on the tube- if it's a problem should I forget about the rest  ? Thanks

The crumbled plastic is fine,  just make sure you plug the neckboard in correctly...

[tommyinajar]

Well I'm going to sit down tonight or tomorrow and try again- The fuse did not blow when it was replaced - and still no crt, not even a glow or hum.  I'm starting to think this isn't going to be a cheap or quick fix...

I was looking for a replacement locally and on Ebay- There is little to nothing. 1 monitor for $285... that seems like a lot for a 25 year old monitor even if it's got a cap kit.

 Are there any other replacements for the 19" medium res monitor ? No easy way even for an LCD hook up or anything like that so the kids can try it

[Kevin Mullins]

Have you confirmed that Super Sprint uses a medium resolution monitor?
(besides Frizzlefried, I know Paperboy uses one)

The P447 chassis was used on standard resolution monitors as well.
Like the 19K7901 which Atari also used.

[2600]

Have you confirmed that Super Sprint uses a medium resolution monitor?
(besides Frizzlefried, I know Paperboy uses one)

The P447 chassis was used on standard resolution monitors as well.
Like the 19K7901 which Atari also used.

Super Sprint is a System II game.  ALL System II games are medium resolution.  Most shipped with the 19k4915, like the one in Shardian's thread, but others like above used a K7000.  Except for 720 which used a 25" monitor.

[Kevin Mullins]

Super Sprint is a System II game.  ALL System II games are medium resolution.  Most shipped with the 19k4915, like the one in Shardian's thread, but others like above used a K7000.  Except for 720 which used a 25" monitor.

Ah... I just browsed through the manuals and it never mentioned medium resolution.
Just everyone was throwing around "K7000" like they were all medium resolution, which most are not. Don't want everyone getting confused that a P447 chassis is always medium res, it's not. And all in all there should only be a few components difference between them, so either way it should be an easy fix with a little experience.

Chad at http://www.arcadecup.com/ is in Green Bay WI, might give him a shout and see what he can do for you.

The bent up neck pins concerns me.
It is common for the plastic the break up and fall apart, just want to make sure nothing else is "broken" back there. (namely pins and the tube itself)

[tommyinajar]

I'm waiting for a response from Chad looks like he's pretty busy. he had a lot in queue when I emailed him.


Yea it takes a while to line them all up (pins) but with some patience it will push on and stay- It must have taken somewhat of a beating because the wooden cover that goes over it in back was the only thing that wasn't there, and with people moving this monster how many times before me....

I'm worried about the tube too. I tried "wiggiling" the pins and there wasn't any movement - is there anyway to test the tube ?

 I can't do  tube swap like I found online from a TV either I suppose.