15V2000 Blowing Fuses on Power Up

richiewoo

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Hi,

I have a 15V2000 that I've been working with for a bit now. I didn't want to post right away, as I wanted to give it a shot, but I'm getting to the end of my rope.

Here's what's up so far:

Game plays blind
Spotkiller not lit
I have HV (I haven't measured it at the anode, but I know I'm getting it because when I discharge, it's there)
Blowing F600 and F700 on power up.

I was heavily concentrating on the HV board because I just thought that everything else was fine and then realized that these fuses were blown. I replaced them and the continually blow on power up. I tested all the transistors and went ahead and replaced them anyway (the U07 and U57s). Tested the diodes for each and they seem to test ok, unless the value they're throwing is wrong.

Tested various other parts and did a tube swap to rule out a yoke problem.

I don't have another chassis to throw in to test with to see if it's a problem with the HV board, but I wish I did. I don't think it's a problem with the HV board...

Oh I also replaced all the transsitors (bottle cap style) mounted to the chassis and tested for continuity with the frame (none). I tested the big caps, and have replacements, but haven't done those yet.

Any ideas? What could be blowing those on power up? They're 2 AMP fast blow fuses.

I thank you in advance.

R
 
OK, OK, I'll do more digging!

I'm going to go over it again tonight. Just thought that I'd throw the question out there, but realized the extent of some of the other XY posts that I can see why someone wouldn't want to get involved!

I'll test some more components and probably come up with something!
 
Yeah,

I checked that bad boy. I was reading the manual (went back to it) and have a few more leads on what to check. I'll have a go at it later and see what's up and i'll post my findings.

Thanks for the reply.
 
Progress?

I checked R101 (R100 was already out and jumped) and I jumped it, and the symptoms changed. R101 tested bad (17Kohms) and so I removed it and jumped the pins (I read that this was ok).

Plugged it back in and whoa! Different symptom!

Spotkiller is now ON! And I have no neck glow. Before I did this (and this is the only thing I did), I would blow F600 and F700 on power up and I HAD neck glow.

OK, this time, any thoughts?? :)
 
More stuff...

Could this be game board related?

I tested the voltage on the Y output on the game board and got readings within range (.5-3.5V) but the X ouptut reads a pretty consistent -13.5 Volts.

I tested the power transistors on the game board, and they seem to test fine.

Would this crazy voltage cause the spotkiller to come on? Or should I be looking elsewhere, possibly the HV board?

THanks!
 
Need to work on the game pcb first

Because I consistently have bad voltage coming from X on the PCB I will straighten that out before going any further with the monitor.

I suspect that this has been the problem all along, as R101 was toast. But will keep updating as I find out more.
 
New Stuff!

So, it's the game board. I talked to my buddy and he told me he spoke to the guy he got it from.

The guy said that the game played blind on player 1, but played on player 2 (it's a cocktail table, so player 2 is flipped).

Anyway, I coined up a 2 player game, and sure enough, I have the ship! Then asteroids! Woo~

The game board is hosed and I have more shit to chase. Lucky me!!

Hope this post will help someone.

~Wooo
 
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