Dig-Dug almost working

[Vintageman]

Hi there, mates!

I´ve just finished a dig-dug, and It´s almost working, but it seems that there´s a little trouble.

In the non-random mode (sequenced mode), the box gets stopped in the first led. (first led shining and all the rest off). If I touch pin 15 of the 4017 (the reset pin) with my audio-probe, suddenly the box starts to work 100% OK, running in 8, 6 or 4 leds mode. (when I raise the probe it gets stopped again)

Reading the 4017 datasheet, it seems that the pin 15 has to be 0v. to let te chip count the pulses. But looking at the dig-dug schematic I seems that the circuit is not designed for getting 0v in the reset pin.

I´ve measured Pin 15 of my one´s dig-dug and it´s 3,8v.

The qwestion is....is that value correct? or maybe it has to be 0v.

I think that the problem has to be in one of the 4 regulator pins of the 4017, probably pin 15.

Thanks in advance.