(Topic ID: 233742)

Escape from lost world - Sound static


By albose

5 months ago



Topic Stats

  • 5 posts
  • 2 Pinsiders participating
  • Latest reply 5 months ago by albose
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#1 5 months ago

Recently picked up an Escape from the Lost World as my first pin. Working on fixing up a few things and noticed there is a fair amount of static in the sound. From the forum one recommendation is replace the AD7533 DAC chip at U8. There are several on eBay but they have different suffixes like JN, KN or LN. Does anyone know if any of these are suitable or do I need a specific one? Thanks in advance.

#2 5 months ago

"N" Suffix = plastic DIP package
J, K and L are non-linearity (accuracy) of the recreated sound - J = cheapest, least accurate, L = most expensive, most accurate.
Odds are your ears won't discern a difference between the three in a pinball machine.

What is the one you currently have installed? Should have a J, K or N.
Parts with higher temperature range (typically "D" suffix or ceramic DIP package) have an A, B or C within the suffix or an S, T or U within the suffix.
A = J = S
B = K = T
C = L = U

Also, before looking at the pricey DAC - look at the small value electrolytics first. Particularly the 1uF caps in the otuput section as well as the speaker coupling 1000uF cap.

#3 5 months ago
Quoted from G-P-E:

"N" Suffix = plastic DIP package
J, K and L are non-linearity (accuracy) of the recreated sound - J = cheapest, least accurate, L = most expensive, most accurate.
Odds are your ears won't discern a difference between the three in a pinball machine.
What is the one you currently have installed? Should have a J, K or N.
Parts with higher temperature range (typically "D" suffix or ceramic DIP package) have an A, B or C within the suffix or an S, T or U within the suffix.
A = J = S
B = K = T
C = L = U
Also, before looking at the pricey DAC - look at the small value electrolytics first. Particularly the 1uF caps in the otuput section as well as the speaker coupling 1000uF cap.

Thanks for the great info. I’m not comfortable messing with the board beyond replacing chips. I can get one for $5-$6 which isn’t bad. The part on the one in there now is odd though. It’s PMIPM 7533. No suffix. The manual says the part is AD 7533.

#4 5 months ago

PMI semiconductor (PMI prefix) -- bought by Analog Devices many years ago hence the current AD prefix.

Actually the capacitors are cheaper and much easier to replace than the IC.
Based on the age of the board - you really should look into that.

#5 5 months ago
Quoted from G-P-E:

PMI semiconductor (PMI prefix) -- bought by Analog Devices many years ago hence the current AD prefix.
Actually the capacitors are cheaper and much easier to replace than the IC.
Based on the age of the board - you really should look into that.

Gotcha! Thanks again for the great info. Maybe I will take a look at the caps. Need to learn at some point.

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