(Topic ID: 287405)

No Fear: Check fuses F115 & F116, J112 & Opto 12V Supply

By mikespins

9 months ago


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  • 15 posts
  • 5 Pinsiders participating
  • Latest reply 9 months ago by mikespins
  • Topic is favorited by 2 Pinsiders

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#1 9 months ago

Hi all. Last night I was playing and noticed the left slingshot wasn't working, everything else was fine. I turned off the pin, repaired the slingshot under the Playfield (opposite side of the opto board) and booted up and am getting this error now, and all 4 balls are sent to the subway. I replaced several fuses and tested the rest which did not solve the issue. I also replaced the chip in U20 (socketed) and that did not solve the issue either. The red light on the opto board under the Playfield is illuminated, but LED3 behind the backbox isn't (I've read somewhere it's not supposed to be). I also cleaned all optos with a q-tip.

I've been doing a bunch of searching and see that this is a fairly common issue, but the solutions seem to vary. Hoping to get some help from the Pinside community.

I've attached some pics for reference

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#2 9 months ago

Start by checking your 12VR at TP3 of the power driver, its right next to F115. If that checks out, you will want to verify your 12V is also good on the CPU board.

#3 9 months ago
Quoted from Pin_Guy:

Start by checking your 12VR at TP3 of the power driver, its right next to F115. If that checks out, you will want to verify your 12V is also good on the CPU board.

Thanks. How do I do this?

Also, ran a few tests and traced the wires from J5 on the opto board up to J207 on the CPU board and don't see anything suspicious.

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#5 9 months ago

That is very odd...it's like you have no 12VU to the playfield, but I know you have 12VU on the PDB since you have a working display. I can also tell the switch matrix appears to be working at least in part as the always closed SW, SW24 (Column2, and Row4) is reporting correctly; this makes me want to rule out the 12V to the processor; If I really wanted to check it, I would check across U20 pins 8 and 9, but yours are going to be under that battery board making it harder to access.

#6 9 months ago

Usually is a contact failure on the panel underside the playfield. If your led is not dimming on it check the connection.

#7 9 months ago
Quoted from Pin_Guy:

That is very odd...it's like you have no 12VU to the playfield, but I know you have 12VU on the PDB since you have a working display. I can also tell the switch matrix appears to be working at least in part as the always closed SW, SW24 (Column2, and Row4) is reporting correctly; this makes me want to rule out the 12V to the processor; If I really wanted to check it, I would check across U20 pins 8 and 9, but yours are going to be under that battery board making it harder to access.

I swapped out the chip in U20. The battery board is easy to take off.

Quoted from onlydjz:

Usually is a contact failure on the panel underside the playfield. If your led is not dimming on it check the connection.

Any particular connections you recommend I check? The led on the opto board isn't dimming, if that's the light you're referring to.

#8 9 months ago

In my experience with this, its the cap at C2. If the cap has never been replaced, its very likely it has leaked and caused some corrosion.

#9 9 months ago
Quoted from dsuperbee:

In my experience with this, its the cap at C2. If the cap has never been replaced, its very likely it has leaked and caused some corrosion.

I'm familiar with this type of failure, there is a actually another topic opened today where I believe that to be the case, however I see no indications of that type of problem here. The picture of this part of the PDB isn't the best quality, but IMO its good enough to see a lack of discoloration you would see in the presence of corrosion. A close inspection of this area would let you know for sure but with a functioning SW24 you know for sure that U20 is generating at least 1 column pulse for column 2 and it's being read back through the LM339 for Row4.

That being said, I do replace this capacitor whenever I have one of these old power boards on my bench as a preventative measure if there are no signs that it was replaced.

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#10 9 months ago
Quoted from Pin_Guy:

I'm familiar with this type of failure, there is a actually another topic opened today where I believe that to be the case, however I see no indications of that type of problem here. The picture of this part of the PDB isn't the best quality, but IMO its good enough to see a lack of discoloration you would see in the presence of corrosion. A close inspection of this area would let you know for sure but with a functioning SW24 you know for sure that U20 is generating at least 1 column pulse for column 2 and it's being read back through the LM339 for Row4.
That being said, I do replace this capacitor whenever I have one of these old power boards on my bench as a preventative measure if there are no signs that it was replaced.
[quoted image]

The cap at c2 does seem to be ok.

#11 9 months ago

LED1 is on so you have 12V. You must get back this voltage at J116/117/118. If the result is right your 12V is disappear between backbox and opt board.

#12 9 months ago
Quoted from onlydjz:

LED1 is on so you have 12V. You must get back this voltage at J116/117/118. If the result is right your 12V is disappear between backbox and opt board.

Thanks. What could make it dissappear? I have traced the wires and can't seem to find any breaks or anything. Could bad LM339's on the opto board be the culprit?

#13 9 months ago
Quoted from Pin_Guy:

I'm familiar with this type of failure, there is a actually another topic opened today where I believe that to be the case, however I see no indications of that type of problem here. The picture of this part of the PDB isn't the best quality, but IMO its good enough to see a lack of discoloration you would see in the presence of corrosion. A close inspection of this area would let you know for sure but with a functioning SW24 you know for sure that U20 is generating at least 1 column pulse for column 2 and it's being read back through the LM339 for Row4.
That being said, I do replace this capacitor whenever I have one of these old power boards on my bench as a preventative measure if there are no signs that it was replaced.
[quoted image]

If the cap is original, i would replace regardless. I wouldntn

Quoted from mikespins:

The cap at c2 does seem to be ok.

I wish I took a pic of my last c2 repair. Pulled cap and it had just started leaking. Couldn't tell from either side of the board. Stayed under the cap.

#14 9 months ago

You need to get a meter and test some voltages. You have the connector that should be plugged into J118 plugged into the splitter that powers the color dmd and also plugs into J116. That's ok as J116 and J118 put out the same voltages, but J116, J117 and J118 is where you want to start. You're looking for 12V dc on pin 2 of each of those connectors.

If you get 12V on each of those pins, you need to test your opto board for 12V. Manual will show you which pin carries the 12V.

#15 9 months ago

Thanks for all the help everyone. It ended up being a bad bridge rectifier on the CPU board and bad LM339 on my opto board. Eddie from Pintech socketed the LM339's, replaced the BR & caps and got my #NF back up and running perfectly! While he was at it, he also went over my #T2, installed a coin battery, replaced a broken fuse holder and removed some really bad band-aid hacks. All is extremely well with my pins! Thanks Eddie! You the man!

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