Area 51 Sound Issues

Wayne104

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Sayreville, New Jersey
I have an Area 51 and am having some sound issues. The volume is turned all the way up and can barely be heard. I check and replaced the speakers and made sure there 4 ohms. I can't seem to figure out why the volume won't turn up.
 
the amplifier is probably dead, or you're not getting proper 12V out of your power supply. I suppose also check to make sure the little jumper for MONO/STEREO is set to mono.
 
I have proper 12 volts out of power supply and mono is set. I recently purchased a new board and have the same issue with that one. The way that it's set up is the wire directly from the speakers goes to the board just like in manual. This is not a dedicated cabinet so when the speakers went into jamma harness there was no sound. Where would the amplifier be mounted on the board and what is the best way to check it?
 
what is the best way to check it?

Here's how I check amp ICs:

1) Visual inspection. Is it burned? Severly discolored? Also look at the PCB under where the amp is mounted for severe discoloration. Also look at the solder joints and make sure the heat sink is present and well connected (thermally) to the tab of the amp IC.

2) Look at the amp IC and see what it's part number is. Google it and find a datasheet. Find the pinout on the datasheet. OR... pull up the schematics to see the amp's pinout. On the pinout, identify the power and ground pins. Use DMM to verify power at the amp.

3) Use oscilloscope to probe the amp's output and input pins. You'll need to operate the game in such a manner so as to cause it to generate sound (i.e. start a game) before you can expect to see any signals. If the output is present, you've got an issue with an output coupling cap, or with traces, or with cabinet wiring. If the output is missing, but the input is present... the amp is bad. If there is no input signal, the amp may be good, because there's a problem further upstream.

If you don't have an oscilloscope, a pair of amplified ead phones, or audio an audio probe (homebuilt or otherwise) may suffice. I use a scope, 'cause I have it.
 
Yeah it's definetly bad there's a small hole in the center of it. The numbers off of it are.

TDA1554Q
N50026
HSH9505 2

Where wod be the best place to buy one of these?
 
Making sense of part numbers is part science, part art. You can ignore most of those numbers, you part number is TDA1554.

Google it. Search the major part sellers: Mouser, Digikey, Newark, Jameco. Also try smaller specialty places: The Real Bob Roberts, Great Plains Electronics, Twisty Wrist Arcade, Arcadechips. If all else fails, go to nteinc.com and search the part number for their NTE cross-reference, then search with google for that NTE-number. If that doesn't work, post here in the WTB section, stating the P/N and what it is for.

Yeah it's definetly bad there's a small hole in the center of it. The numbers off of it are.

TDA1554Q
N50026
HSH9505 2

Where wod be the best place to buy one of these?
 
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