LaserActive:PAC-S10 Audio Circuit Service Bulletin Update

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According to a service bulletin from Pioneer, early revisions of the PAC-S10 and S1 needed adjustments to the audio circuit to avoid distorting high frequency audio "when a certain Sega game software is played." However, this distorted audio affects all games and it is recommended to perform the resistor/capacitor replacements.

MDFourier Plots

  • MDFourier plot, pre-fix

    MDFourier plot, pre-fix

  • MDFourier plot, Post-fix

    MDFourier plot, Post-fix

Installation

You will need the following parts for this modification:

  • 33K 0805 1/10W+ Resistor (Qty 4)
  • 100K 0805 1/10W+ Resistor (Qty 2)
  • 27K 0805 1/10W+ Resistor (Qty 2)
  • 22K 0805 1/10W+ Resistor (Qty 2)
  • 3.3K 0805 1/10W+ Resistor (Qty 2)
  • 120pF 0805 25V+ Capacitor (Qty 2)
  • 820pF 0805 25V+ Capacitor (Qty 2)

Note: The bulletin also indicates that the large surface mount electrolytic AC coupling caps (C117 and C21) are to be replaced with 1 uF, 50V rated caps. This is not required, but recommended.

Replace the parts indicated as directed in the list below:

  • Service Bulletin Audio Circuit Schematic

    Service Bulletin Audio Circuit Schematic

  • Parts to be replaced, highlighted

    Parts to be replaced, highlighted

Using the parts above, replace the parts as indicated:

  • R31, R58, R32, R59 - 33K
  • R33, R34 - 100K
  • R131, R52 - 27K
  • R38, R40 - 22K
  • R39, R41 - 3.3K
  • C16, C17 - 120pF
  • C33, C34 - 820 pF
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