(Topic ID: 322375)

Stern Hot hand no 1000 pt sound

By dabomb1

7 days ago

Topic Stats

  • 6 posts
  • 2 Pinsiders participating
  • Latest reply 2 days ago by dabomb1
  • Topic is favorited by 1 Pinsider


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#1 7 days ago

Their is no sound for the 1000 pt on a stern hot hand. All other sounds OK. Where do I test on schematic.

#2 7 days ago
Quoted from dabomb1:

Where do I test on schematic.

Test point TP2. It should measure about 2.5V indicating the 1000 point tone generator is oscillating.


#3 7 days ago

I'll try that, thanks.

#4 3 days ago

It looks like it's U9 (4103). Part is ordered. Thanks for the awesome drawing.

#5 2 days ago
Quoted from dabomb1:

Thanks for the awesome drawing.

Sorry I didn't go into enough detail in that first reply.
I made that diagram a few years ago for someone else's problem unrelated to yours and it's missing the chip that generates the 1000 tone frequency to the left of U9 which is a LM323 at U17

While the 4013 chips do fail, so do the LM323's.
Output pin 8 of the U17 LM323 is for the 1000 point sound. It goes to the U9 pin 11 input pin. So measure U9 pin 11, it should also measure around 2.5 volts. If it does, U9 is likely faulty. If it doesn't U17 is likely faulty.

#6 2 days ago

I'll check it out.Thanks again for the help.

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