(Topic ID: 313162)

Space Shuttle low background sound issue

By GLSP3022

1 year ago



Topic Stats

  • 8 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by GLSP3022
  • Topic is favorited by 1 Pinsider

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#1 1 year ago

I'm having an issue with the background sounds and sound effects on a Space Shuttle. The volume is always very low.
The speech works incredibly well, it's super loud! Both adjustment pots regulate the speech. I've ruled those out.
I've replaced both amps on the speech mixer board with no change.
Chris Hibler did extensive work on the MPU board. I know he changed the caps and soldered the headers.
I swapped in the speech board from my Comet with no change. I feel the issue is on the MPU side. I also checked the speakers. They are good.

At a bit of a loss. Sound is not my strong suit.

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#2 1 year ago

Bump for ideas

#3 1 year ago

If you think it's the MPU swap it to your Comet and see if there are any problems? Might not be the exact same problem depending on what sounds Comet has but I would think it would manifest in some way

#4 1 year ago
Quoted from Knxwledge:

If you think it's the MPU swap it to your Comet and see if there are any problems? Might not be the exact same problem depending on what sounds Comet has but I would think it would manifest in some way

I'll have a 2nd working Comet in my possession next week. I'll definitely be swapping that MPU into the SS and see if things clear up. Mine is a bit hard to access easily.

#5 1 year ago
Quoted from GLSP3022:

I'm having an issue with the background sounds and sound effects on a Space Shuttle. The volume is always very low.
The speech works incredibly well, it's super loud! Both adjustment pots regulate the speech. I've ruled those out.
I've replaced both amps on the speech mixer board with no change.
Chris Hibler did extensive work on the MPU board. I know he changed the caps and soldered the headers.
I swapped in the speech board from my Comet with no change. I feel the issue is on the MPU side. I also checked the speakers. They are good.
At a bit of a loss. Sound is not my strong suit.
[quoted image][quoted image]

Low sound:

Disconnect the speech board and Install a Jumper at W10
Still low sounds?
Replace Q51 2N3904

Re Test

#6 1 year ago

Swapped in a 2nd working MPU from a Comet. I get the same low sound.
The MPU works in Comet, not in the Space Shuttle.

Bad volume pot in the cab?

#7 1 year ago
Quoted from PINTEC:

Low sound:
Disconnect the speech board and Install a Jumper at W10
Still low sounds?
Replace Q51 2N3904
Re Test

PINTEC you're on to something here. Unplugging the speech board returns the background sound to both MPUs I've tried.
W10 has a staple installed.

#8 1 year ago

Cutting the Jumper at W10 fixed the issue.

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