Arcade Collecting > Pinball
Fireball 2 Sound Issue
ChadTower:
Always start with the connectors in a pinball machine. They are like beer - the cause of and solution to all of life's problems.
FrizzleFried:
--- Quote from: ChadTower on January 04, 2011, 03:13:30 pm ---
Always start with the connectors in a pinball machine. They are like beer - the cause of and solution to all of life's problems.
--- End quote ---
Not in this case.
There are 3 channels to this S&T board. A "voice" channel. A "simple sounds" channel and the "effects" channel... The voice channel works. The simple sounds channel works (chimes and a couple of the effects) but the 3rd channel... it no workie workie...
...well, it WORKS (you can hear it VERY faintly) but it's not amplifying. Due to the nature of the issue it HAS to be something on board... right?
FrizzleFried:
--- Quote from: pinballjim on January 04, 2011, 10:03:15 pm ---Have you replaced the amp section? Can you jump channels from the quiet one to a working one?
:dunno
--- End quote ---
I'm working my way there... I'm not too experienced at this stuff but I have a friend (in Canada) who is working through the board with me.
We believe the problem lies in the pre-amp as I do believe there is a single amp fed by 3 pre-amps. If the amp was the problem, none of the sounds would be working (again, a hypothesis). Unfortunately, the two chips I socketed and swapped were key in the pre-amp circuit and the problem didn't follow...
FrizzleFried:
I got a lot of good news and a little bad...
Good news:
Got a DAC in the mail today and dropped it in... now my background and effect sounds are working!
Bad news:
All sounds work except one. The one sound (at game power-on and the same sound is supposed to fire when a ball is kicked in to the shooter lane) DOES fire... you can hear digital static play when the sound is supposed to play.
ROM issue?
The rest all work as advertised... and this one sound missing doesn't detract from the gameplay as it only fires when the ball gets kicked in to the shooter lane (and at power up)...
FrizzleFried:
Bah... cleaned 'em up and popped them back in... same problem.
I then checked the continuity between the legs and the socket solder joint on the backside of the PCB and found no problem.
I guess the next step is to get another ROM set and try those.
We ARE talking about the sound ROM's on the S&T board... right?
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