Star Trek distorted sounds

TheDrewster

Well-known member

Donor 2012
Joined
Oct 5, 2008
Messages
7,668
Reaction score
314
Location
Reno, Nevada
The Star Trek Cockpit I picked up today works great. But the sound and speech are somewhat distorted. If I didnt already know what the speech said, I would not recognize what the game is saying. Everything sounds pretty tinny and jagged. I have narrowed it down to the "Universal Sound Board" and I was wondering if anybody knew anything about these boards?
 
congrats on getting the SOS cockpit!

now you should probably sell off those mini's you have cluttering up your game room :D
and let me know if you fell for that.
 
I could be wrong but it sounds like to me the distortion is on both the voice and the sounds. Sounds come from the Universal sound board. The Voice comes from the Speech board. I could have it backward as it's been a wile sense I worked on one but I think the output of the speech board goes into the sound board where it's mixed and the out put of the sound board goes to the input of the sound amp which is built into the power supply. If it was only the voice distorted I would say a bad OP amp chip on the sound board input but it could be the sound board or the sound amp. You can trouble shoot this with a battery powered amplified speaker. Years ago I bought at Radio Shack a simple battery powered amp with a built in speaker with volume control and it had 2 binding posts for the input so you could use test meter type probes. I could put the test leads on the out put of the speech board or sound board to test the sound output. You could wire up a set of computer speakers to do the same thing, just use one channel. You could also input music directly into the audio amp from a line level source like maybe an Ipod to see if the amp is distorted. Well that's how I do it. Just an idea, I am sure their are other ways to trouble shoot. Also are all of your sounds distorted or just some and are any of the sounds missing? Look in the manual, the sound board is broken into 3 parts and the manual tells you which sounds are generated buy which section so if only one sound is missing then you know which section on the board to trouble shoot.
Congratulations on the score. :D
 
Well then in that case, I am 99% sure that my sound amplifier is the problem.


Now what? :(
 
I had a similar problem a few years back on my upright. If I remember correctly, I replaced the small number of axial caps on the speech and universal sound boards, and that fixed the problem.

Jon
 
Replaced all caps on the amplifier circuit- not fixed.
Replaced diodes D4 and D5 in the amplifier circuit- not fixed.
Replaced power transistors P5 and P6 under the heat sink (TIP120 and TIP125)- FIXED!!!

The sound is clear, the speech is understandable, and I am THRILLED I was able to fix it for under $20 hahaha. A HUGE thanks to all that helped me!!!
 
Replaced all caps on the amplifier circuit- not fixed.
Replaced diodes D4 and D5 in the amplifier circuit- not fixed.
Replaced power transistors P5 and P6 under the heat sink (TIP120 and TIP125)- FIXED!!!

The sound is clear, the speech is understandable, and I am THRILLED I was able to fix it for under $20 hahaha. A HUGE thanks to all that helped me!!!

I knew you could do it :bigok:
 
Replaced all caps on the amplifier circuit- not fixed.
Replaced diodes D4 and D5 in the amplifier circuit- not fixed.
Replaced power transistors P5 and P6 under the heat sink (TIP120 and TIP125)- FIXED!!!

The sound is clear, the speech is understandable, and I am THRILLED I was able to fix it for under $20 hahaha. A HUGE thanks to all that helped me!!!

Gotta love the ones (repairs) that work out, well done :)
 
Back
Top Bottom