(Topic ID: 122705)

SC lamp problem (Video of problem added)

By twinmice

9 years ago


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  • 70 posts
  • 12 Pinsiders participating
  • Latest reply 6 months ago by DumbAss
  • Topic is favorited by 5 Pinsiders

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There are 70 posts in this topic. You are on page 2 of 2.
#51 8 years ago

Weerstand 0125W.pngWeerstand 0125W.png

#52 8 years ago

So even though the one is Gold/Red/Blue/Red and not Gold/Red/Blue/Brown its still just a 1K? The other one matches the 10K.

#53 8 years ago

Red black red gold is 2K ohms.

Get a resistor reading chart, then you can figure out any resistor.

#54 8 years ago
Quoted from kbliznick:

Red black red gold is 2K ohms.

Yes, correct.
Page 2-14 gives a list of part description
SC 2-14.jpgSC 2-14.jpg

4 years later
#55 4 years ago

Just for people’s reference - I had the same problem in terms of some of the lamps being out of sequence. I replaced all the ICs (thanks Ken!) and now it works.
I also had battery damage on the board which is weird as it’s a fair way from the battery. This was causing 3 or 4 lamps to not light at all - but this was unrelated to the out of sequence problem which is clearly an IC problem.

2 years later
#56 2 years ago

Hi guys i have similar problem but with some stuck lamps, this happen as soon as i start the game, i change ic's but no change, any idea ?

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1 month later
#57 2 years ago

Resurrecting a really old thread here. Hoping someone can help with problem #2 below. I originally experienced two issues with my Safecracker backbox board game lights.

1. Many of the lamps were one space off from what they should have been (i.e. if L22 showed on in test, L23 would actually light) which is the same problem the original poster had. Thanks to this tread, I removed all the old 4094 chips, soldered in sockets and replaced with new 4094 chips and this problem was solved. Awesome!

2. The center 8 lamps would not light at all which include the vault lamp and 7 others that are all tied together by following the board traces. Unfortunately replacing the chips did not fix this issue. I have tried incandescent and leds which does not change the behavior.

So with problem #2, where do I go next? This board does not allow simple continuity tests since it has a bunch of diodes, IC chips and other parts.

#58 2 years ago

Those 8 lamps may be driven via the same 4049.
Make sure the chip is inserted correctly.
Make sure that the chip is receiving power, ground, and control signals.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#59 2 years ago

Lamp map.
What is the center lamp number? L31? It looks like 131 in the scan below.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info

pasted_image (resized).pngpasted_image (resized).png
#60 2 years ago

Thanks for the two responses Chris. The center lamp is actually L40. L33-L40 lamps are the ones not working and I "believe" they are driven by the U4 4094 chip. Since the lamps were not working before or after I replaced the chips, I am assuming something else is wrong as you mention in the previous message. But I have no knowledge how to test the things you recommend...power, ground and control signal at that chip unless u walk me through using my voltage meter on certain settings and at specific points on the chip/board like I am a 2 year old. I have mechanical skills, but my electrical skills are sorely lacking.

Quoted from ChrisHibler:

Lamp map.
What is the center lamp number? L31? It looks like 131 in the scan below.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info[quoted image]

#61 2 years ago

Get the schematics in front of you and your DMM set to continuity check.
Buzz the connections shown for the chip.
My first guess is that you will find an "open" for one of the connections.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#62 2 years ago

Post a high res in focus pic of the chip circuit that drives those lamps.
That will help.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#63 2 years ago

I believe U6 drives L33-L40. This was a picture when I had the chips off the board.

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#64 2 years ago

The schematics are tiny so its almost impossible to read even in the original manual. Pretty sure D19 is the common diode for L33-L40 lamps. Continuity from banded side of that diode to one side of lamp pad for each lamp pings.

#65 2 years ago

Hi, wow forgot about this thread, but I did replace all the 4094 chips and socketed them, after everything worked great, I agree would one of the sockets needs to be checked. Mike

#66 2 years ago

I can't read the online schematics at all.
But there appears to be an LM339 in the circuit, attached to the clock pin of the 4094.
I'd connect the lamp board and place it so that you can probe the 4094 with a logic probe.
Power on.
Probe pins 1, 2, 3, 8, and 16. 8 and 16 will be low and high respectively.
Compare the operation of 1, 2, 3 on the suspect 4094 to the operation of the same pins on a working 4094.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#67 2 years ago

I tested voltage on the band side of all the large diodes by the connectors that supply power to the lamps. They all measure about 4v except for D19 which only measures 8.8mv. So it looks like D19 might be my culprit. Another order to digi key I guess.

#68 2 years ago

Posting an update that replacing the 1N5401 diode fixed the 8 lamps with no power/light issue in case others experience the same problem.

1 year later
#69 6 months ago

Just found this topic that seems related to my issue.

I noticed 16 lamps out on my safecrackers backbox. Looking at the schematics it appears the 16 lamps are associated with two 4094 chips on the auxiliary board. Also the only other thing that seems to be related is the two of the six 4094 chips that are out are powered by the same purple/white wire combo. I checked the fuse and it's good. I'm assuming the 4094 could be the issue but what can I check?

Also how would I order replacement chips. I can't find identical numbered chips for the 4094 ones if that turns out to be the issue. There are many similar varieties of this chip and not sure which is which.

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#70 6 months ago
Quoted from marspinball:

I can't find identical numbered chips for the 4094 ones if that turns out to be the issue. There are many similar varieties of this chip and not sure which is which.

CD4094BE

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