CEI Hot Slot information

[Judge]

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.

[Judge]

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.

[Judge]

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?

[Blueslots]

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 

[OldReno]

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.

[jbshocks]

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.

[Judge]

Thanks! Quite right!
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!!

[jbshocks]

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?

[Judge]

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.
 

[jbshocks]

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.