Capcom ZN2 Motherboard Sound Problem machine gun noise

[chacal231077]

Hi!

I have a sound problem, when I make inputs with the buttons, I have a machine gun noise coming out in addition to the sound effects of the shots.

The computer also when it releases shots, the sound of machine guns is heard.
I have already changed one of the Dual Op-Amp 4558 near the mono stereo switch, the AK4310VM DAC WITH ATT & MIXER, Sony CXD2925Q

but still the problem, I tried with the Star Gladiator 2 Rom Board, it's the same problem.

Thanks for your help

 

[Hammy]

Maybe a fault inside the CPS2-B input and sound cpu controller chip?
Does this happen when you use the kick loom buttons or just the normal buttons?

 

[chacal231077]

Maybe a fault inside the CPS2-B input and sound cpu controller chip?
Does this happen when you use the kick loom buttons or just the normal buttons?

Hi!

but where is this chip on the motherboard ?

So the problem is present with or without kick harness

 

[chacal231077]

ok i found Sony CXD8661R is custom overclock chip request by capcom

I have a spare ZN 1 motherboard, I don't know if it's the same reference, I'll look

 

[Hammy]

the cps2-b is about the kick buttons only so not this fault.

it may be the mcu - this one , i think its the same for zn1 and zn2 but never tested mixing them...

also maybe the regular input buffers faulty

 

[chacal231077]

Hi

the cps2-b is about the kick buttons only so not this fault.

it may be the mcu - this one , i think its the same for zn1 and zn2 but never tested mixing them...

also maybe the regular input buffers faulty

Hi!

you also say perhaps that the regular input buffers are defective, compared to when I press the buttons, but the computer when it does its techniques does it too, it's curious.

I looked at a ZN1 motherboard that I had as a spare, it's the same MCU, but no luck, it was corroded and a leg was missing .

Is there an equivalent today or is it a custom chip for Sony ?

 

[Hammy]

It's a programmed part, so no replacements...