Taito B System - Nastar color issue

[Tailsnic Retroworks]

Hi, I have discovered powering on my 2 Nastar boards that there are revisions with wrong color resistors values.

This is the correct Nastar:

And this is the bad Nastar: (darker)

The issue is with those 8 resistor values. They differ on each one of the boards, and they are home-soldered, no signs of external changes during its life:

The good values I have measured are (left to right):

33ohm
470ohm
33ohm
470ohm
33ohm
470ohm
33ohm
470ohm


The bad values I have measured are (left to right):

330ohm
470ohm
330ohm
470ohm
330ohm
470ohm
330ohm
470ohm

So, the conclusion is in the factory, there has been a mistake with the 33ohm resistors, and the bad one uses 10x value to 330ohm.

I'm going to exchange them and see if it works.

 

[Tailsnic Retroworks]

Confirmed. Bad factory value. Now good with 33ohm resistors.