Table of Contents
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Service
Manual
• For purposes of improvement, specifications and design are subject to change without notice.
• Please use this service manual with referring to the operating instructions without fail.
• Some illustrations using in this service manual are slightly different from the actual set.
S0177-0V02DM/DG1011
PM8004
PM-KI-PEARL-LITE
Copyright 2010 D&M Holdings Inc. All rights reserved.
WARNING: Violators will be prosecuted to the maximum extent possible.
PM8004 /
PM-KI-PEARL-LITE /
Integrated Amplifier
K1SG/U1B
N1SG/N1B
N2SG/N2B
s
Ver. 2
Please refer to the
MODIFICATION NOTICE.
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Table of Contents
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Summarization of Contents
Safety Precautions
Leakage Current Check
Procedures for performing leakage current and line-to-chassis resistance checks.
Servicing Cautions
General safety warnings and handling precautions for service technicians.
Important Safety Parts
Guidance on using specific safety-rated replacement parts.
Technical Specifications
Power Output and Performance
Details on power output, frequency response, and total harmonic distortion.
Unit Dimensions
Physical dimensions and weight specifications for the unit.
Disassembly Procedures
Front Panel Assembly Disassembly
Step-by-step instructions for removing the front panel assembly.
Rear Panel Disassembly
Steps to disassemble and access the rear panel components.
Main PWB Assembly Disassembly
Instructions for removing and disassembling the main printed circuit board.
Service Mode
Microprocessor Version Check
Procedure to check the microprocessor firmware version in service mode.
Protection Mode
PROT-1 (pin6) Abnormalities
Detection of power amp abnormal conditions via PROT-1 signal.
PROT-2 (pin7) Abnormalities
Detection of power supply circuit issues via PROT-2 signal.
Firmware Upgrade Procedure
Necessary Equipment
List of required hardware and software for firmware updates.
Writing Procedure
Step-by-step instructions for writing new firmware to the unit.
Adjustments
Idling Current Alignment
Procedure for adjusting the idling current of the amplifier.
DC Offset Voltage Adjustment
Steps to adjust the DC offset voltage for speaker outputs.
Troubleshooting
Power On Issues
Diagnosing problems when the unit fails to power on.
Protection Mode Issues
Troubleshooting protection circuit activations and related faults.
Block Diagram and Level Diagram
System Block Diagram
Overview of the unit's internal functional blocks and signal flow.
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