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(Topic ID: 269583)

Stern flight 2000 speech issue


By amphicar4fun

6 months ago



Topic Stats

  • 10 posts
  • 4 Pinsiders participating
  • Latest reply 4 months ago by tyking
  • Topic is favorited by 2 Pinsiders

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#1 6 months ago

Hello guys. I'm having some issues to have the speech working on my flight 2000, so I hope you can help me. I have read all related topics, and tried everything.

I got my flight 2000 without the speech card, so I bought it from a pinside member, that had tested it ok on his flight 2000, before ship it to me. The issue is that it speaks at the right times, but only garbitch.

I have already checked the jumper on the SB-300 and it's ok. Since the speech happens, also proves that is getting out of the VSU-100 and amplified on the SB-300.
I have changed all caps on the speech board.
I have checked the eprom. I have read it and compared with the one at IPDB, and it matches perfectly.
I have checked the cable that goes from the VSU-100 to the driver board, and all wires are ok. Besides, all lamps work just fine, so it should be ok.
Since the speech sounds happen on the right times, I believe that the main chip on the VSU-100 is ok.
Any input will be highly appreciated!

#2 6 months ago

Can you describe the garbage sounds in more detail?
High/low pitch? "speaking" for an excessive or short amount of time? Does it sound like the audio is clipping?

#3 6 months ago

Hello. Thanks for the feedback. It's like clipping. I'll make a short video and place the. Link here.

#4 6 months ago

Hi. Here is the youtube link with the speech sounds.

Thanks!

#5 6 months ago

I'm gonna guess power supply to the VSU-100. I believe it daisy-chains on the lamp-driver for power: Could be connector or pins somewhere in that chain.

#6 6 months ago

I agree with dr_dude this could be the issue. The GI power creates the -10V on the board (J3-1). TP-3 should be -10v according to the schematic, but IIRC some of the test points may be mislabeled!

#7 6 months ago

Hi. I just checked the 5v and the -10v. All good.

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#8 6 months ago

Good that is correct, not good it does not solve your problem.
Unfortunately, you may need to trace the audio signal back through the LM1458 dual op-amp to see where if there is a point at which it becomes distorted. Perhaps the op amp, or one of the related passives in the audio output path needs replacing or solder reflow.
A scope would probably be the best way to do this. Maybe a pair of headphones with a dc blocking capacitor if you are careful.

#9 6 months ago

Great, thanks for the tip. I'll reflow solder as the first step. If the issue is still there, I'll try the headphone with dc blocking capacitor. I've never heard about this method, but I'll do some research on it, since I don't have a scope... Last case, I'll replace all the components on the audio output path.

2 months later
#10 4 months ago

Is it working? I’m having a similar issue. Thanks.

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