Dec 082015
 

I bought this faulty original Jungle King PCB from a JAMMA+ forums user last year but I never had time to look at :

Jungle King_PCB

The game itself is a classic, I remember I was used to play it during my childhood in arcade rooms and on home computer.So, I decided to fix it once and for all.Time to build the needed JAMMA adapter (board use a separate connector for power) and I got this scenario on first boot:

issue

All the sprites were intact but background graphics were all messed up.The RAM test reported no problem :

RAM_test

But, since all the RAMs on CPU and VIDEO board were already socketed, I want to test the chips out of circuit anyway and I found a bad 2016 @IC56 on CPU board:

TMM2016@IC56

With a good RAM fitted, the graphics were perfect now but the background music was absent, I could hear only the sound FXs.After some research I found that the CPU board was missing a ROM @IC52:

missing_ROM@IC52

This ROM is, indeed, responsible of the music and only few games on same Taito SJ hardware have it so probably my board was a conversion from another game which didn’t use it (Elevator Action seem to be the common donor board).Anyway, antoher great classic preserved!

 

 Posted by at 11:34 pm

  One Response to “Jungle King repair log”

  1. Nothing worse than failing RAM. The problem with RAM is that unlike TTL, it will try to go on and just spit garbage out. I have yet to see a self test or RAM tester that can 100% detect bad RAM. Usually the only way to be sure is to check output on a oscilloscope or simply swap it out.