Volume adjustment on Frogger cocktail

trickman

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Sound issue on Frogger cocktail

I've been looking all over this thing and I'll admit I don't know the first thing about where the volume knob/adjustment is on a Frogger cocktail. This is my first cocktail machine and it has me stumped. Please help. Thanks in advance.
 
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Well, the Frogger cocktail manual was uninformative. On the upright, there is a panel inside the coin door with a volume knob and some test switches. On the cocktail, you probably have to lift up the top glass and look inside for a similar panel...
 
Yep, the manual is useless in this regard. I have the top off, the lower panel off, and I've looked all over the machine. I can find the on/off button, monitor reset button, service switch (which gives more credits only) button, but no volume control. I've been literally hunting for hours around the machine to find it. Where could it be?
 
we had a couple of these table games on our route way back in the day. As I recall, I think that it was on the bottom of the machine either in a recessed hole or behind a small metal cover that you take off with a screwdriver from the outside.

Grab a mirror and a flashlight and look on the bottom of your machine and see if that's the case.
 
Wow Ken, you are the man! That was it! I only found the two before (on/off and monitor reset), but upon further investigation, I found out what was thought earlier by me to be a bolt sticking out of the bottom of the machine was actually a volume knob all the way on the other side of the machine! Thank you for helping me solve that mystery!

I turned up the volume and unfortunately found out why the previous owner turned it off... It emits an annoying high pitched interference sound out of the speakers instead of the regular Frogger sounds and music. Bummer. Now I have to find out why it's doing that.
 
As to the high pitched sound, the first thing I would do is reseat all the socketed chips on the gameboard set.

Double check the power supply connectors and the solder connections on the power supply board.
 
As to the high pitched sound, the first thing I would do is reseat all the socketed chips on the gameboard set.

Double check the power supply connectors and the solder connections on the power supply board.

Sounds fun. But I guess it's the first thing I ought to do. Thanks!
 
I've been looking all over this thing and I'll admit I don't know the first thing about where the volume knob/adjustment is on a Frogger cocktail. This is my first cocktail machine and it has me stumped. Please help. Thanks in advance.

There's a 6-pin connector next to the audio amp that should wiring going out to the volume control pot... just follow the cable from that connector, and you should find the pot at the other end...
 
There's a 6-pin connector next to the audio amp that should wiring going out to the volume control pot... just follow the cable from that connector, and you should find the pot at the other end...

yep I found it. Thanks!
 
Okay, here is a pic of where I traced the volume control to on the board. The cord with the white plug on the end is it.

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When I unplug it from the board, the high pitched whining sound stops.

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I also reseated the socketed chips like Ken suggested. Still makes the sound. What's next?
 
So, after seeing that the high pitched sound goes away (in fact, no sound comes through the speakers at all) if I unplug the white connector from the six-pin connector on the board, am I to assume the wire is bad? Or do I possibly have a bad chip on my board? Thanks for any help you can offer.
 
My next step is to get my board tested by a pro. I have a local guy that'll charge me $20 to test the board and see if it's the sound chip that's causing the problem. Is that a decent deal, since I'm such a noob with this stuff or no?
 
It is unlikely that your cable is bad. The reason that sound goes away when you unplug that cable is because it disconnects the speaker from your PCB.

If you just want it (hopefully) diagnosed & maybe repaired for $20, do it. If you want to explore the problem further yourself, let us know. The next step I would take is to check the line level audio at the input to the amplifier chip.
 
It is unlikely that your cable is bad. The reason that sound goes away when you unplug that cable is because it disconnects the speaker from your PCB.

If you just want it (hopefully) diagnosed & maybe repaired for $20, do it. If you want to explore the problem further yourself, let us know. The next step I would take is to check the line level audio at the input to the amplifier chip.

Yes, I want to explore the problem further myself. Any money I can save by not paying someone else to fix something is fine by me. $20 would be a diagnosis charge only (I'm pretty sure). I have a Frogger AND and Arkanoid: Revenge of Doh cocktail to fix up, so yeah...I'm ready to dive in and do this.

I do have some standups, but all of them were cleanup jobs only. The sound issue problem with the Frogger doesn't scare me, but the Arkanoid: R.O.D. plays blind and frankly the idea of getting jolted from doing something stupid with a monitor kinda freaks me out. I'm usually wary about asking for help in many situations (just how I am), but this time I'm afraid I'm in WAY over my head. I'll provide pictures an whatever else you guys need. But I really want to get these machines working so I can concentrate on the cleanup part afterward.

Since I know next to nothing, how exactly do I check the line level audio at the input to the amplifier chip?
 
Since I know next to nothing, how exactly do I check the line level audio at the input to the amplifier chip?

Some manuals for Frogger can be found here. *NOTE* There are different variations of Frogger boards because it was licensed to (not sure who manufactured yours):
http://arcarc.xmission.com/PDF_Arcade_Manuals_and_Schematics/

I think you could try pins 2 and 6 of U109 if it is an LM741 on your PCB with a an ear-bud or some other small headset or self-amplifying speaker. If you hear something there and it sounds OK, the problem may be your audio amplifier (M51516L on a heat-sink) or it's supporting components.

PS I once knew next to nothing about arcade games too! :)
 
Some manuals for Frogger can be found here. *NOTE* There are different variations of Frogger boards because it was licensed to (not sure who manufactured yours):
http://arcarc.xmission.com/PDF_Arcade_Manuals_and_Schematics/

I think you could try pins 2 and 6 of U109 if it is an LM741 on your PCB with a an ear-bud or some other small headset or self-amplifying speaker. If you hear something there and it sounds OK, the problem may be your audio amplifier (M51516L on a heat-sink) or it's supporting components.

PS I once knew next to nothing about arcade games too! :)

Hehe, let me process all that info and get back to you. Thanks much!
 
Update: Got the board tested by a pro. It's definitely a board issue. The board whined for him too. Tried replacing both sound chips, made the same noise. He then said it was beyond what he could do, which was disappointing.

Should I just give up and eventually look for a working replacement Frogger board? I'm not very skilled and I don't have extra money to put toward another Frogger board right now.
 
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