Gottlieb system one question

GORDONFAN

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Here's what I have. When I turn on my Close Encounters a few of the bonus lights are lit on the playfield and the cpu won't boot. If I turn the power off and on several times(sometines five) those lights are out and the cpu boots and the game plays fine. I've done the ground mods, the slam switch bypass fixed the conectors,new power supply. I know it's nothing to do with the driver board. I've checked the voltage at the test plug and it is supposed to be at about -12 and go to 5 about a second after the power is turned on. well it's at like -9 and goes to about 3.5 and I know the pinball repair site suggests replacing I think q25-26 in the reset but I think the problem may be in the input to the power supply at pin 6-7 it is supposed to be 69 ac ,but i'm only getting 34-35 ac at both pins and I know this input comes from the small transformer in the bottom of the cabinet And I believe the 69 volts ac controls the logic on the cpu so if I'm thinking right this could be what is causing my problems .Question is do you think it's possible for the transformer to realy shoot craps like that and give a lower voltage. I'm not very good with the SS pinball machines yet I'm mainly an EM guy. I'm just sick of turnning this thing off and on a bunch of times to make it work.

Glennon
 
it is supposed to be 69 ac ,but i'm only getting 34-35 ac at both pins

How are you measuring the AC? Are you measuring across the pins or with one meter lead on ground? To me it sounds like you're measuring with one lead on ground which will give you approximately half of the reading you're expecting. I doubt you have a transformer problem but anything is possible. The first thing I would do is triple check that you're getting an accurate measurement.

I would try manually resetting the CPU when you've having these problems and see if it boots consistently with a long manual reset. If so I would look at the reset section of the MPU. Assuming you've done all the other obvious stuff. Also assuming that you don't have a transformer problem.
 
How are you measuring the AC? Are you measuring across the pins or with one meter lead on ground? To me it sounds like you're measuring with one lead on ground which will give you approximately half of the reading you're expecting. I doubt you have a transformer problem but anything is possible. The first thing I would do is triple check that you're getting an accurate measurement.

I would try manually resetting the CPU when you've having these problems and see if it boots consistently with a long manual reset. If so I would look at the reset section of the MPU. Assuming you've done all the other obvious stuff. Also assuming that you don't have a transformer problem.
After some more checking you are correct I was checking the pins wrong so I was only getting half so I'm thinking it's in the reset part of the cpu. How do I go about reseting manualy?
Glennon
 
After some more checking you are correct I was checking the pins wrong so I was only getting half so I'm thinking it's in the reset part of the cpu. How do I go about reseting manualy?
Glennon

Power is always the first thing to get going.
You not only need the proper voltages, you also need -clean- power.

The 3.5V and -9V will never work. Where are you measuring these? At the power supply? At the CPU board? Where are you grounding the meter?
Are the filter caps on the power supply originals?

Ed
 
Power is always the first thing to get going.
You not only need the proper voltages, you also need -clean- power.

The 3.5V and -9V will never work. Where are you measuring these? At the power supply? At the CPU board? Where are you grounding the meter?
Are the filter caps on the power supply originals?

Ed
Power supply is new and I was testing at the test plugs on the cpu.
 
OK -- do you still measure 3.5V at the CPU?
And does the power supply measure 5V at the power supply?

Ed
5v at the power supply #.5 at the test plug of the cpu. Once it boots it plays fine so I don't understand what's going on. I'm thinking about buying the replacement board and being done with it.


Glennon
 
5v at the power supply 3.5 at the test plug of the cpu. Once it boots it plays fine so I don't understand what's going on. I'm thinking about buying the replacement board and being done with it.


Glennon

So, you have a 1.5V difference in power between the power supply board and the CPU?

Ask nearly anybody that has worked on Gottliebs as to what the #1 problem with them is.
--- Connectors!!!! ---

What you measure at the power supply must always be the same as what you measure at the CPU board. You will never have a reliable machine if you only have 3.5V at the CPU board. Even with a new replacement board, you will run into reliability problems with power like that.

Ed
 
Save yourself some time in the long run and repin the entire game. Yes the entire game :) Everything in the head needs to be done. That will solve a lot of issue and prevent others from popping up in the future.
 
So... along these lines... what would a pin noob like myself need to order if I were going to repin all the connectors in a Gottlieb System 1 game (Charlie's Angels in my case).
I have nothing... is there a parts list somewhere or a place I can order from who can create such a package of items?
 
So... along these lines... what would a pin noob like myself need to order if I were going to repin all the connectors in a Gottlieb System 1 game (Charlie's Angels in my case).
I have nothing... is there a parts list somewhere or a place I can order from who can create such a package of items?

Your answer is the guy who's already posting in this thread. Ed from Great Plains Electronics.

I'm sure he'll chime in but I'll give him my recommendation anyway. Great guy. He'll have what you need:

http://www.greatplainselectronics.com/
 
I second Ed. He has a great supply of parts and excellent prices, ships quickly and is super knowledgeable.
 
So... along these lines... what would a pin noob like myself need to order if I were going to repin all the connectors in a Gottlieb System 1 game (Charlie's Angels in my case).
I have nothing... is there a parts list somewhere or a place I can order from who can create such a package of items?

For starters, you can read about this stuff here:
http://www.pinrepair.com/sys1/index.htm
And more importantly, here:
http://marvin3m.com/connect/index.htm
This article mentions a BCT-1 crimper. The actual manufacturer (Rostra Tool) part number for this crimper is 1026-CT.

As far as parts -- I may be a little biased along this line. But, I do have what you need here:
http://www.greatplainselectronics.com/products.asp?cat=37

You'll need contacts such as 08-52-0072 for the edge connectors.
You -can- reuse the existing connector shells but sometimes they are a real bear to reuse and don't look too good. You can find most edge connector shells needed -- starts with "09-01-" prefix.

For the power supply connectors, you can reuse the shells but the contacts should be replaced. Use 08-52-0113 for these. If you choose to replace the shells -- use CS156-xx-LR on the same page above. Replace the "xx" with pin count such as "06". I also have the plastic keying pins used on the power supply plugs -- 15-04-0219. You would need all of two of these if replacing the three power supply connectors.

Most pricey part is you will need a crimp tool. A-fantastic- tool is the 3136-CT but at $95, these are out of most people's reach. For a reasonably priced tool, go with the 1026-CT or W-HT-1919. The 1026-CT costs a bit more but is easier to use than the W-HT-1919. I'm sold out of 1026-CT's but have a case of them on order and are due this week. You can find these crimp tools here:
http://www.greatplainselectronics.com/products.asp?cat=53

-- Ed
 
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Thanks Ed.
It's my intention to purchase Pascal Janin's PI-1 X4 PCB so I will most certainly be placing an order and replacing/repinning the relevant connectors.

Sorry for the pseudo-thread hijack Glennon.
 
Just replaced all the edge connectors in my Cleopatra what a pain... but know I know I can rule out any problems in the near future.

VB,
 
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