One of the last issues I had with my EROS ONE machine was with the LED display panels. Several of the IC's were bad and the ones that were working were running extremely warm. I decided the best option was to just rebuild and upgrade them. The display panels are brighter, use less energy, have better filtering, and run cool. The only original parts used were the PCB, connector, caps, and the resistors for the individual LED's.

The new LED's are superbright at a very low current. I used 14 of them from Digi-Key (Part # 1497-1075-5-ND) which had the same pinout. Instead of the 74164 and 7447 chips I went with 74LS164 and 74LS47 as low power replacements. Unsoldered the LEDs, removed the IC's, and all the resistors for the 7-segement displays. From there I installed the new 7 segment displays, new red LED's, sockets for the IC's, and new resistors for the 7-segment displays. At first I tried 1K resistors for the segments but they were way too bright and bumped those up to 2.2K 1/4W which looks good. The resistors for the individual LED's were left alone.

Whenever I've used the TTL chips I usually see a small decoupling/bypass capacitor installed near the power at each chip. The Allied Leisure display panels had pads for those caps at each chip but nothing was installed. Maybe that was a cost cutting measure. I went ahead and installed some .01uf caps at each spot.

I'm really happy with the results. The display panels look great and don't even get warm now. I expect this same upgrade would work on many of their other cocktail pinball machines.

Robert

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Does anyone know how to delete images from a post?? I tried and only ended up marking one image not appropriate for work. Didn't see a way to un-mark it to be appropriate again or an easy way to delete images. Never run into a forum that handled images in such a way..

Thank you!