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TECH: SB100, '78 Stern Wild Fyre sound
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bobnatlanta
Dec 22, 2005, 4:01:15 PM12/22/05
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Or rather no sound.
The speaker is good, tested with another source. All caps on the SB
100 have been replaced. Connectors between MPU and SB have all been
replaced. Pot on speaker replaced.
Nothing.
Any other ideas?
Action Pinball
Dec 22, 2005, 6:35:27 PM12/22/05
to
If you're not getting any "hum" from the speaker, then the
connections/wiring from the board to the speaker may not be good- open
circuit somewhere. If it is "humming", then most likely you've got
something else on the board that is to blame- or signal not making it over
from the MPU board- those ribbon cables are notorious for bad connections.
May even have a stuck address or data line or other CPU signal- I had a
Stern Magic once that the VMA line was stuck on the sound board- it would
halt the MPU whenever sound board was plugged in. Replaced a 740x chip and
that cured it.
connections/wiring from the board to the speaker may not be good- open
circuit somewhere. If it is "humming", then most likely you've got
something else on the board that is to blame- or signal not making it over
from the MPU board- those ribbon cables are notorious for bad connections.
May even have a stuck address or data line or other CPU signal- I had a
Stern Magic once that the VMA line was stuck on the sound board- it would
halt the MPU whenever sound board was plugged in. Replaced a 740x chip and
that cured it.
Ray J.
--
Action Pinball & Amusement, LLC
Salt Lake City, Utah USA
Web: www.actionpinball.com
We're serious about pinball. Anything else is just for fun!
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