Left Speaker sound problem in Crisis Zone - Time Crisis

TheBasement

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Left Speaker sound problem in Crisis Zone - Time Crisis

I have a Crisis Zone which uses the same Namco "GASHIN" Strong Bass System that Time Crisis II uses. All sounds are present in the game and sound really strong and "bassy". However, 50% of the time the left speaker cuts in and out. I pulled out the left speaker and checked for bad solder joints or connector, and unplugged and replugged all connector assemblies back to the PCB's. The same issue still exists.

I read somewhere that maybe one of those 2 relays might be the issue. Can someone confirm this is a relay issue? Does each really belong to a separate speaker, or is one for the bass and the other for both speakers? Why does it even use relays, can they be bypassed without causing issues? Or is it just a bad amp chip on board?
 
Im bumping this up to mege this problem thread. Im having the same sort of issue. I have NO sound from the top speakers, but bass is good. On the sound amp it looks like the signals do split, the sub using one relay and the speakers on the other. What is interesting is that this amp has two jumpers, presuming that it is to send bass to the sub and mid high to the top speakers. If i CHANGE the jumpers from "mix" to "thru" the top speaker and sub will both work with midrange sound. Depending on the jumper its either the left or right speaker, but never both. That verifies that the speaker wiring is good, and the problem is likely in the amp. I am goingt o try changing one of the relays. When the game first powers on i can hear one of the relays click as the amp comes on, but i dont ever hear the other one.
 
The relays need to be cleaned. Take 'em apart, clean the contacts, and see if that gets you goin' again like it did my last 3 with the same problem :)
 
That's exactly what it was. I took out the amp and cleaned the contacts on the right relay, sound is now perfect. Those plastic covers are a bear to get off though...
 
Have a TimeCrisis II dual cab that only was getting a very muffled bass and this solved my issues after quick sanding of the contacts of the relays and it sounds great!
 
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