New Life Games Tech Forums

My CEI Hot Slot had the following symptoms - only the fluorescent lights and fan worked when switched on, no reel reaction and no led display. Upon checking voltages I found no voltage coming out of bridge rectifier BR1. Upon replacing BR1 I now had 18V on both capacitors C81 and C84.
The symptom now changed that all segments in the led display illuminated "88888888888", still no reel reaction.

With the LED display all illuminated "88888888888" I checked all my regulators for voltage, VR2, VR3, VR4, VR5 and VR1 all seemed ok. Battery also was good - 3V. Without schematics I downloaded datasheets of various IC's used on the board so that I could do some fault finding. When I came to testing U1 (uPD4464) I found that the pin itself (pin 28 5V VCC) had actually corroded and meant replacement of the IC. Replacing the IC restored the machine, I now have reel reaction and normal LED display. I now have an error code.

The machine is now switching on, the reels run and all stop in the same position. I now get the following error code on the LED display E48ddd. Can anyone tell me what this code means?

Don t the code dut I had kind of the that  I change the back plain board  and work  don't no if that will work  :103-

You might try emailing unitedcoin.com I think they work on/build the CEI's??? At least I think I remember them having some on their slot routes.
I'm sure some tech there could give you a list of error codes.
I'd offer, but we didn't part employment on good terms.

Sounds like you are making progress.  E48 ddd is a reel position error.  It is telling you that you have the reels in the wrong place.  When I first started to get a spark of life from mine this plagued me badly.  There is a chance that all 3 reels are in the wrong place but it could also be that you have the wrong eprom installed.  are the eproms labeled the same on both?

I honestly think you have the same issue that my machine had.  I would get this error and after cleaning the eyes, the reel reflectors and adjusting the air gap on the optics I could clear it but it would come back.  I think your issue is 18 volts.  I don't believe this machine uses 18v anywhere.  Is it the LM350 that is giving you 18v?  Take a look at this thread http://newlifegames.net/nlg/index.php?topic=14944.0  One of the tiny orange caps was bad.  I believe it was c74 but it could have been c77.  Check the LM350 (VR5) for 24 v and post back.

Thanks! Quite right! :89-
I had somehow mixed up my eprom (U2) - changed that and machine works!!!
After that, I had no sound - but after a few checks found that the volume potentiometer R32 was open circuit. Replaced it with a 1K ohm potentiometer and machine is now working 100%. Thank you to all!! :131-

Congrats on getting it running.  You have no reliability issues?  I am curious about the 18 volts but this may be a different part of the board.   Also my working board is a rev H and U1 is not socketed.  is your chip socketed or did you have to desolder it?  My 2 non working boards are rev g.  Almost all chips on rev g are soldered on and on H there are a number of sockets so there must be a fair number of chips that failed on these.  All 3 of my boards had the 5 big caps as 4700 uF 25v its interesting that yours are 2200uf 50 v.  Are all 5 of yours the same on both boards?

So far I have not experienced any reliability issues. The 18V I measure is over capacitors C81 and C84 - and that is on both my Rev C and D boards. I only have 4 big caps on my boards. C81,C84 and C32 are 4700mf 25V, C85 is 2200mf 50V (original solder on both boards). U1 is unfortunately not socketed and being a double sided PC board makes life challenging! I will post some pictures over the next few days.
 :259-

my mistake,  4 large caps not 5.  All are the same 25v 4700uF.  C85 I had to upgrade to 35v.   Strange that they changed the uF and I sure don't understand why they went with a 25v on a 30+ v circuit.