(Topic ID: 248416)

Grand Lizard System 11 High Voltage fuse blows on power up


By treborlicec

8 months ago



Topic Stats

  • 8 posts
  • 3 Pinsiders participating
  • Latest reply 8 months ago by treborlicec
  • Topic is favorited by 1 Pinsider

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#1 8 months ago

Good afternoon folks. Looking for a direction to go here. The High Voltage fuse blows on power up in my Grand Lizard. When I got the game, there were 2 displays that had new glass and all worked. The new glass was in the right hand side Alpha Numeric and the Ball/Credit display. This fuse issue happened right after I used regular clear silicone to adhere the glass to the circuit board of the 2 displays that had new glass. Whomever replaced them did not do that part. I can't imagine what may have happened with the silicone, but I unplugged the 2 suspect displays and put in a new fuse and it still pops upon power up. Everything was totally fine prior to the silicone. I guess I'll use a razor blade and separate the glass from the circuit boards and see what's up. Any ideas, in the meantime?

Thanks,
RC

#2 8 months ago

personally I would just get rid of the glass display and replace it with a led.
and eliminate the High Voltage all together.
those old displays won't last for ever.

#3 8 months ago

I can see that at some point if they don't work, but they were all 5 fully working when i got the game. I don't like to replace things that work (although they aren't right now, hence this post lol).

#4 8 months ago

Followed the advice in this post:

https://pinside.com/pinball/forum/topic/need-help-with-system-9-11-power-supply#post-3139938

The F1 fuse still blows even with connector 3J5 removed so, I'm guessing that means I need to rebuild my HV section on this PS. I have installed new caps already.

Anyone know of a good place for a kit? GPE seems to be out of stock and I don't find any ready to go kits with a quick google.

Thanks,
RC

#5 8 months ago
Quoted from treborlicec:

Followed the advice in this post:
https://pinside.com/pinball/forum/topic/need-help-with-system-9-11-power-supply#post-3139938
The F1 fuse still blows even with connector 3J5 removed so, I'm guessing that means I need to rebuild my HV section on this PS. I have installed new caps already.
Anyone know of a good place for a kit? GPE seems to be out of stock and I don't find any ready to go kits with a quick google.
Thanks,
RC

Marco and Troxel both have the parts.

MJE1503 Transistor (it will different pinouts then the one you have.
2N5401Transistor, PNP (Replaces MPSD52)
MJE15031 Transistor, PNP (it will also have different pinouts then the one you have)
2N5551Transistor, NPN (Replaces MPSD02)
1N4730A Zener Diode, 3.9 Volt (Replaces 1N5990) ZR1, ZR3 so you'll need 2.
1N4763A Zener Diode, 91 Volt (Replaces 1N4764) ZR2, ZR4. 2 again
1N4004 Rectifier, 400V, 1A D3, D4. Get 2!
RMOS2-39K Resistor, 39K, 2 Watt (Replaces 39K, 1⁄2 or 1 Watt) R1, R4 (Get 2)
680, 1⁄2 Watt Resistor.
RCF1/2-330K Resistor, 330K, 1⁄2 Watt R3, R6 You'll need 2.
This will lower the voltage to the displays a bit (assuming you still have the original gas displays) and replace parts that are simply old.

///Rich

#6 8 months ago
Quoted from RichWolfson:

Marco and Troxel both have the parts.
MJE1503 Transistor (it will different pinouts then the one you have.
2N5401Transistor, PNP (Replaces MPSD52)
MJE15031 Transistor, PNP (it will also have different pinouts then the one you have)
2N5551Transistor, NPN (Replaces MPSD02)
1N4730A Zener Diode, 3.9 Volt (Replaces 1N5990) ZR1, ZR3 so you'll need 2.
1N4763A Zener Diode, 91 Volt (Replaces 1N4764) ZR2, ZR4. 2 again
1N4004 Rectifier, 400V, 1A D3, D4. Get 2!
RMOS2-39K Resistor, 39K, 2 Watt (Replaces 39K, 1⁄2 or 1 Watt) R1, R4 (Get 2)
680, 1⁄2 Watt Resistor.
RCF1/2-330K Resistor, 330K, 1⁄2 Watt R3, R6 You'll need 2.
This will lower the voltage to the displays a bit (assuming you still have the original gas displays) and replace parts that are simply old.
///Rich

Thanks Rich. What do you mean by different pinouts? Will I have to cross transistor legs or something when I install them?

EDIT: nevermind, I found the info on that. I do have to cross the legs. I'll get these ordered.

#7 8 months ago

Ordered everything from Marco and will update this thread once I rebuild the HV section.

#8 8 months ago

HV rebuild brought everything back. Guess it was a coincidence that the HV crapped out right after I used the silicone on those displays.

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