Gorf - lost sound effects in right channel.

Jeff F

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The sound effects are fine on the left channel... and the voice is fine on the right channel... but I'm missing all sound effects on the right channel...

Does this ring a bell with anyone? If so, do share please. :D
 
Good idea, but the pot. controls the overall volume on the right channel which is the voice plus the sound effects. I can adjust the voice up and down... but there are no sound effects coming through.
 
There's a 330 ohm (IIRC) resistor in each sound channel amplifier that likes to burn up. Remove that little board with the pots on it and check - in mine I had one that was just cooked and burnt and open.

-Ian
 
While your at it upgrade those resistors to 1/2 watt. They are ALWAYS cooked. Most of the time they are still within spec but I have seen a few that were either open or way off.
 
Ah, didn't even think about the amplifier board there. Will take a look this afternoon with my finger's crossed. :)

Thanks for the idea! :beerchug:
 
From your description, it sounds like the amp board is fine. I'd start at the "game board"......it's the board (in the cage) with the two long connectors plugged into it. This board handles audio and input/output. There's two big 40-pin chips in the lower right hand area. These two chips are the same.....they are custom audio/input/output chips. I'd swap the two, and see if the issue changes. Keep in mind....you could have control issues when you change these....so start a game and play it to make sure all buttons/controls work. I'm finding these customs are dying with more frequency as they age.

Edward
 
Getting ready to work on this now so I'll keep my fingers crossed it's just a resistor and not one of the custom ICs. I do have a "few" spare sets of Wizard of Wor PCBs here... did they also have this custom IC?

I'll report back soon...
 
Ding, ding, ding, DING! Ed is the winner. :)

One of the custom chips was defective. The controls worked completely fine, and the game appeared to work as it should except for the missing sound effects from the right speaker(voice was fine and still coming out of the right speaker).

Swapping the custom chips around led to no sound effects(or voice) coming from the left speaker, and the right speaker now had both sound effects and voice.

Pulled a custom off one of the extra Wizard of Wor sets I have here and we are now good to go. Funny thing is the chips control the channel opposite to the side they are on on the PCB...
Wizard%20of%20Wor%20-%20main%20PCB.jpg


So using the picture above, the left chip controls the right sound effects and the right chip controls the left sound effects.

Thanks again guys! :beerchug:
 
Those customs should have been heatsinked. I have a bunch of dead ones sitting here myself.

All three Astrocade customs are a good candidate for reproduction. I'm pretty much out of all my spares. I just tossed 8 of the CPU board custom at location X3. This was from the last eight months worth of repairs. Another few years from now and it's gonna get ugly for Gorf, Wizard Of Wor, etc.

Edward
 
All three Astrocade customs are a good candidate for reproduction. I'm pretty much out of all my spares. I just tossed 8 of the CPU board custom at location X3. This was from the last eight months worth of repairs. Another few years from now and it's gonna get ugly for Gorf, Wizard Of Wor, etc.

Edward

...professor pac, robby roto
Hey Jrok, we need your help!
 
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