What's new

caius

Grand Master
Joined
Nov 21, 2016
Messages
562
Reaction score
834
Location
Italy
The Konami '056602' is another ceramic audio module along the lines of the more well known '05498A' and '054544.You can find it on 'GX' and 'GV' system hardware :

Konami GX System

Konami GV System

It's located in the audio section just near the main amplifier :

056602-original.jpg


As said, the part has a fragile ceramic package (of 38 pin with an unusual 'ZAG-ZAG' configuration) hence it can easily breaks off in pieces like happened to the author of the below picture (credits to 'AstroX' on AP forums)

broken.jpg


Technically speaking the Konami '056602' is essentially a DAC (Digital to Analog Converter) which , indeed, converts into analog the digital audio signals from the board, then it does pre-amplification and lasty output them to the amplifier and audio headers on the board.All the other components are passives, mostly ceramic capacitors and laser trimmed print resistors but, like the "cousins" '054986A' and '054544' audo modules, there are some SMT electrolytic capacitors on the other side of the module :

capacitors.jpg


These capacitors with aging can leak corroding the circuit around or have their ESR value altered causing scratchy sound or total lack of it.'Seb' from RepArcade posted a useful maintenance tutotial (with capacitors chart) on his blog :

Konami '056602' soundboard

Given all these premises plus the fact someone in the past asked me to take this audio modue into account, a reproduction was certainly worth so I accepted the challenge.The main obstacle was, besides drawing the schematics of the module, identyfing all its components as well as measuring the precise values of the passive parts (some hidden like some printed film resistors), you can't go wrong otherwise the reproduction will not sound like the original.I made no prototyping and routed a first board layout that was manufactured and shipped to me in some days.The assembling took some time due to the large number of components involved (some were obsolete and hard to find) but I managed to complete an unit ready for testing :

056602-reproduction.jpg


The "debut" was successful, no design mistakes were done and the reproduction sounded exactly as the original module.Here is testing on my PCBs :

View: https://youtu.be/QbxJ8IKOrIs


View: https://youtu.be/QTGkcJUmVow
 

Attachments

  • 056602-original.jpg
    056602-original.jpg
    14.6 KB · Views: 47
  • broken.jpg
    broken.jpg
    13.5 KB · Views: 42
  • capacitors.jpg
    capacitors.jpg
    13.7 KB · Views: 46
  • 056602-reproduction.jpg
    056602-reproduction.jpg
    13.9 KB · Views: 44
  • 056602_reproduction.jpg
    056602_reproduction.jpg
    258.9 KB · Views: 44
Last edited:

zionfarm

Enthusiast
Joined
Jul 1, 2018
Messages
269
Reaction score
118
Location
Woodbridge, Virginia, USA
Great work brother. Saw your audio module for a G.I Joe Konami PCB on YouTube.
 
Top