Pioneer CDXP23S is an old model and has been top useful for me to find this Manual. CD Player is still repaired.
Text excerpt from page 69 (click to view)
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2. Diagnosis
1 POWER AMP Assy
A
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Remove the Rear Panel. Remove the MAIN Assy (equipped with HDMI&DVC Assy and DSP&USB Assy) and the AUDIO IN Assy from the INTERFACE Assy. Discharge C5721 and C5722. (See the "discharge procedures.") Remove the two screws that fix the Regulators attached to the Chassis. Remove the two Push Rivets and the two screws that fix the POWER AMP Assy. Regulator
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Remove the Locking Card Spacer from the Chassis using Cutting Pliers.
B
Locking Card Spacer (for fixing the Assy)
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Cutting Pliers
Remove the four screws that fix the Heat Sink V5S. Cut the Binder. Remove the four screws that fix the Power Transformer. Place a high insulating material under the Power Transformer to raise it. Raise the block and diagnose the POWER AMP Assy B side.
C
Push Rivet
POWER AMP Assy
DIODE Assy
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D
POWER AMP Assy
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Caution: Fix the DIODE Assy to the Rear Panel with Tape so that it will not come closer to other Assy.
Tape DIODE Assy
E
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Remove the two screws that fix the diode of the DIODE Assy. Reassembling the MAIN Assy (equipped with HDMI&DVC Assy and DSP&USB Assy) and the AUDIO IN Assy to the INTERFACE Assy. Reassembling the Rear Panel. (Keep a space for earth and about six to seven screws fixing places. Do not attach screws with the Chassis.)
