Re: Bally Fathom sound problems


Guess what? The memory reset advice worked!!!

Thanks Chester! I appreciate you helpful advice. Thanks to all who
responded. A damned good, informative group here. Very useful indeed.



"Chester Pete" <pfmatthews*REMOVE*@aol.com> wrote in message
news:e4ocqs$g2c$1$8300dec7@xxxxxxxxxxxxxxxxxxx
No - it won't fix that :(
Reckon you could try reseating the chips on the sound board. Look for
tarnished legs and V carefully clean before reseating. If they are
tarnished
then they will be v brittle so be careful. It would probably be better
giving the legs short bursts from a can of Switch cleaner and no pressure
of
any sort (from a cloth).

Here's some info from Marvin's: note only 4 flashes should be seen
First Flicker.
Fakers Guide: No flicker means a bad U5, flaky U15, leaky C1, open R1,
leaky
CR1, or bad U17.
Techno Guide: On power up, U1 requires +5 volts to be applied before the
reset line is allowed to go high. If this condition is met, the LED does a
quick "flicker". At power-on, C1 slowly charges via R1. The voltage across
C1 is monitored by U15. When it reaches 1.7 volts DC, U15 take the reset
line high. Diode CR1 across R1 provides a quick discharge path for C1 in
the
event the +5 momentarily disappears.

First Flash.
Fakers Guide: No first flash means a bad U6, U15 or U17.
Techno Guide: The U1 chip tests the U6 RAM. It attempts to write then read
back all 256 patterns in each of the 128 scratch pad RAM memory locations.
If U1 completes the 256 x 128 = 32,768 tests, the LED is flashed.

Second Flash.
Fakers Guide: No second flash means PIA U7 is bad.
Techno Guide: The U1 chip now tests the first PIA U7. Each of the two PIA
chips U7 and U11 are interchangeable. The test is the same for both. If it
determines the two PIAs are good, the U1 chip performs some test. This
includes testing each of the two full byte port initialisation registers,
testing the two full byte I/O registers, and testing the CA2 and CB2
ports.
If all checks out, the LED is flashed.

Third Flash.
Fakers Guide: No third flash means PIA U11 is bad.
Techno Guide: The same test above is performed on PIA U11.

Fourth Flash.
Fakers Guide: No fourth flash means sound generator U12 is bad.
Techno Guide: The U1 chip performs a test on the sound generator chip U12.
The U12 chip is controlled by PIA U11. If the sound chip passes the LED is
flashed the fourth time. A bad PIA at U11 can also cause no fourth flash!
Or
a bad connection between the three chips U1 (microprocessor), U7 (PIA),
and
U12 (sound generator).

*No Fifth S&T Flash on Fathom (and some other games).


"Joe Mann" <joemann@xxxxxxxxxxxxxx> wrote in message
news:4amdnYXPL_4ELPLZnZ2dnUVZ_tKdnZ2d@xxxxxxxxxxxxxxxxx

Thanks Chester, I'll try this. I see that the sound card is failing the
initial test (I'm only getting 3 flashes from the light - supposed to get
five). Would you still recommend resetting the memory given the above?


"Chester Pete" <pfmatthews*REMOVE*@aol.com> wrote in message
news:e4oajn$dj9$1$8300dec7@xxxxxxxxxxxxxxxxxxx
Try resetting the memory - it could be the battery is bad or you
haven't
played it for a while.
You need to check the manual about how to do this but briefly it means
the
following:

When the machine is on, open the coin door and press the small red
button
about 5 times until you see "01" in the credit window. Operate the coin
switch and player 1 display will show zero.You have just reset one of
the
audits (best to do this really).
Press the red button again to show "02" and operate the coin switch
again
to
reset.
Keep doing this red button/coin switch thing until you get to "16" in
the
credit window. From now on it changes.
Repeat the Asterisk section until the game reboots (after option "18")
*******
This time, press and hold the CREDIT button until you see "03". Press
the
red button to advance to the next option.
*******
At this point, the machine will reboot and hopefully your sound will be
back!

N.B. When you have "18", this is the sound option. This must be set to
"03"
(use credit button) to have background sound.
However, To make sure this works you must set options "16" to "18" to
have
valid values between "00" and "03". If you don't then it may not work.

Its all in the manual but its not easy to find

good luck.


"Joe Mann" <joemann@xxxxxxxxxxxxxx> wrote in message
news:IcGdneMSS-OSw_LZnZ2dneKdnZydnZ2d@xxxxxxxxxxxxxxxxx
Hey all - it's been a long time since I've been here...

My Bally Fathom has been great to me over the years, but I find myself
having another relatively minor problem with the sound. I'll keep the
problem description brief for now... Basically the "background sound"
(and
some of the other sounds) are no longer working. That kind of eerie
humming
(theme from Jaws) that continually plays can no longer be heard. Some
of
the
sounds still play (like "Oh Yeah" when you drop a quarter in). Can
anyone
point me in the general direction in terms of a fix? Perhaps someone
can
recommend a decent repair shop in the Sacramento, CA area?

Thanks.










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