I have the manual. And the back box did not work with the regular lamps before I switched to LED

So here is my dilema. using the schematics and testing.

At the a12J1 connector from transformer I get 7VAC at pins 3/4/12/13.

Going to the next connector in the link A9J3 Pins 1&10 should be 6VAC and I do in fact get 7VAC here.

Then moving to the switch on Relay A. this is where my problem is:

When the switch is the OPEN top lug gives 7.0 and the Bottom lug gives 0.1

When the switch is CLOSED both lugs read 2.1.

Pins 3&12 on the A9J3 should read 6VAC because this is after the relay but because my switch they read 2.1.

The Coil on the relay does not read anything if I have the black probe touching the common wire and the red probe touching either lug of the coil.

I am also getting 2.1 at the backbox on each and every lamp. No where near the 6VAC I need.

On my tee'd off I get vastly different readings.

*I have cleaned the switch, no change.
*I have jumpered the switch lugs, no change.

If I remember right? The back box line also runs though the TILT relay (T) . Might be another place to investigate.

I believe the flashers run through T relay. And they're working at this time.

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Wheres a good place to get a replacement glove flipper?

Pinball resource, he has most of the gottlieb parts

Also Marco specialties

just ordered a new relay coil, hope this helps my issue with backbox gi

Hello everyone! I just picked up a Freddy and Terminator 2 Monday and last night while a friend and I were playing the auto fire mechanism stopped working so I had to plunge my own balls during multiball. Is this a known issue, or is there any advice you guys would have? I am hopeful that it is just a quick fuse fix possibly? Thanks in advance! Love the game so far

Thats cool, i have a Freddy problem also.

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I have it every now and then with mine. All switches work correctly in test mode so couldn't tell you where to look.

Sigh. Replaced the coil relay. Still no change. Still no back box lights. Same voltage readings.

Are you sure you don't have a bad/shorted lamp socket/diode somewhere?

I only just started reading your issue, but sounds like you have voltage until you close relay then it drops low. This would lead me to believe something is drawing down the voltage.

I just quickly read over the posts though, so maybe you already checked them all.

Well I unplugged every bulb in the backbox gi, when I do this I get correct voltage when the switch closed (6v).

As soon as I add 1 bulb anywhere in the back box it drops to 3v

Too much resistance at a bad/loose/corroded connector or fuse holder possibly.

Otherwise, still could be a socket or diode itself.

Did you try a couple different sockets?

I tried about 5 of them. All same result

You said you replaiced the "A" relay coil; are the contacts clean/adjusted correctly?

Just like when a fuse/fuse holder gets dirty oxidized or loose fitting, dirty or poorly mating contacts can potentially allow voltage across without letting much current across. So, what you can get is correct voltage until you apply a load; then the voltage can drop.

If you put in 1 bulb, it goes down to 3VAC; 2 or more bulbs may drop it even further.

If these connection areas are not it, then I would have to lean back towards a socket that is shorted/dirty/corroded/covered in flux (either inside socket or on backside), or a failing diode on any one of the sockets.

While your checking fuse and holder conditions, make sure it has correct fuse in it! If someone way over fused it so it didn't blow, it could cause a heap more problems letting it run like that.

I did make sure the contacts were cleaned and adjusted correctly, That was the first thing I did before all this testing.

All the sockets look great. which sucks because I am not sure how to tell if one is shorted.

Also the fuse is correct, I made sure of that and testing it inside the system and outside the system. 15A normal fuse in spot F8.

How can I go about testing the sockets?

Well. The tricky part is that a lot of parts are hard to test in circuit accuretly.
We want to see that the center pin is not shorted to the outer casing, but we also need to check the diode on each.

You can check resistance from center pin to case (or from tab to tab on backside of socket) and compare to each other to see if any appear different. You can use diode check on meter and test each diode in both directions and compare to the other diodes.

Hopefully you will find something that measures different from the rest. The problem winds up being sometimes they are hard to measure when wires are hooked up. I don't want to start you down a path of having to unsolder and resolder a bunch unless it seems totally necessary.

I remember a couple guides on socket cleaning/checking...I'll see if I can find a link.

I keep mentioning the socket diodes, but now I can't remember how they are set up on freddy...I wad thinking of the little circuit board ones they mount on some of the sockets. There are diodes on those g.I. sockets arent there? I'll geel stupid if there aren't. Lol. Maybe a quick pic of backside? Thanks, sorry about that. Any one else?

I can snap a picture later on tonight, but I honestly don't think they have them. There's one big diode connected to 2 ground wires, but the sockets just have a white and black wire in the back of them

Here's some

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Ohh shoot, ya sorry. I havent had mine open in a long time and am so used to other pins...I forgot that they have those type of sockets. Sorry.

Well, you should still be able to (with power off and all bulbs in back removed) check resistance of each socket compaired to others as a start. Just use meter leads on the two little socket halves from front side.

Thats a start.

All harware on those screwed down terminals is tight right? No bad crimp on a ring terminal or anything.

EDIT. Sorry for extra posts, since all sections are just contuations of a row of parallel sockets, could you try unscrewing them and only hook up the first section? That would tell you something if the first section worked.

Yeah I can try and unscrew from the last row forward see if anything changes. I will also test resistance.

Cool. Sorry again for all the info about a different socket type originally.

Ok so tested the resistance, and there all the same. They all read 192 on my meter when set to 20k ohms.

Also I tried disconnecting the chains. Even with disconnecting all of them up to the last one no change on voltage

Ok. So if it is still going low when a bulb is inserted in first set, with all other sets disconnected, it is either a bad socket in first set, or farther back in wiring somewhere else, obviously.

1 thing, I notice 2 wires on each side at start (the striped ones). Is there somewhere else those wires are going to? Like I would expect 1 set of incoming power wires screwed down to the first set of black and white ones. What is that second set?? Id it feeding another set of lamps somewhere else that may need checked? I don't have schematic and cant get to my freddy right now to check myself.

2nd thing (if that doesnt help), do you have some extra wires or a couple test cables so that you could leave the first lamp set totally disconnected (at both ends!) And say hook up second set or something to the power wires? That way, if it is still going low with a bulb, we know it wasn't in the first set of sockets either and know for sure to look elsewhere.

I believe all the striped wires are the flashers, nothing is missing from the harness

I can try that second thing you mentioned

Ok. In pic it looked like 2 white wires with grey and yellow stripes feeding to the white wire

And 2 white wires with black stripe feeding black wire.

Maybe I'm just not seeing it correctly in pic.

Oh that is correct, I think that's the power wires from harness

My thoughts were why is there 2 of each wire??

I'm thinking 1 of each bring power up to all the backbox lights, and the other set must continue power on to somewhere else!

If you are not sure, you could try metering the wires separately and if only 1 set has power, just hook those up. Then see if back box lights work and if lights are out somwhere else (that would rule out backbox lights and tell you where else the second set feeds to).

I'm taking a break from working on the GI. Im pretty hopeless on it.

What's some high scores?? I have yet to hit dream warriors mode. And never got to trade the krugerands. But so far around 250k is my high score. This game is a blast when u get 4 ball multiball going

Happy B-day Freddy (Robert England)

I'm thinking I'm gonna try and switch the transformer out of my teed off into freddy to see if that fixes the backbox GI.

This sound like a good idea?

Well I did this tonight and sane issue. So I know it's not in the first chain of sockets.

So my issue is elsewhere. I'm debating changing the transformer to narrow that out. It's only a few plugs and 4 bolts but ugh I'm not in the mood to take apart 2 games

Did you ever figure out where that second set of striped wires goes to/comes from?

Ok so now testing those wires. They both have the same reading. Around 5v. Like 4.8 when the switch is closed

My teed off is entirely different I'll include a picture. On teed off the double wires go through the chain a lot more than just the beginning but teed off uses all 44lamps, freddy uses 555s.

So now I get about 5v at the wires. But 2.1 when the lamps are hooked up. Even if it's just one lamp

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Can anyone please post a picture of there backbox? The inside where the lights are.

I want to make sure those striped wires are in the correct spot

My backbox looks a bit different then yours.

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Finnflash thanks so much, it's the same backbox. If you meant compared to the pictures on this page a few posts up, that's my tee'd off backbox. I posted my freddy backbox on the last page.

But that did confirm my wires are correct, so I gotta keep looking.

Hey Nightmare folks. I just discovered one of these games and played it in Las Vegas at the Pinball Museum. If anyone's ever willing to part with one I would really love to get my hands on one for my brother. He's a total Nightmare on Elm Street freak.

Thanks

Kevin

Anyone looking to sell their Nightmare on Elm Street?

Made a few instruction cards

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Freddy Instructions.png

Selling those lovely cards to Freddy club members, by any chance?

I'm not selling or trying to make money off these, just sharing with the community. You can print them at the link below. They should already be measured so should be good to go, just don't scale when you go to print. Printing on glossy photo paper usually yields the best results.

Let me know if you print them and the size is not right so I can correct it.

https://drive.google.com/open?id=0B1x5zi_lSbetMkR3dWdsREZOdWM