Harman Kardon AVR125 Service Manual
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Harman Kardon AVR125 Service Manual

Harman Kardon AVR125 Service Manual

Dolby digital
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Download this manual See also: Service Manual, Owner's Manual
harman/kardon
A/V DOLBY DIGITAL RECEIVER

SERVICE MANUAL

ESD WARNING......................................2
LEAKAGE TESTING.................................3
BASIC SPECIFICATIONS.........................4
FRONT PANEL CONTROLS.....................5
FRONT PANEL DISPLAY.........................7
REAR PANEL CONNECTIONS..................9
REMOTE CONTROL FUNCTIONS.............11
INSTALLATION AND CONNECTIONS........14
TROUBLESHOOTING GUIDE..................16
MICROPROCESSOR RESET...................16
UNIT EXPLODED VIEW..........................17
AVR125
CONTENTS
DISASSEMBLY PROCEDURE...............18
AMPLIFIER BIAS ADJUSTMENT............21
BLOCK DIAGRAM...............................22
IC PINOUTS.......................................23
TRANSISTOR PINOUTS.......................52
ELECTRICAL PARTS LIST....................53
PCB DRAWINGS................................62
SCHEMATICS....................................70
WIRING DIAGRAM..............................82
PACKAGING......................................83
harman/kardon, Inc.
250 Crossways Park Dr.
Woodbury, New York 11797
2/2005
Rev5

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Summary of Contents for Harman Kardon AVR125

  • Page 1: Service Manual

    AVR125 A/V DOLBY DIGITAL RECEIVER SERVICE MANUAL CONTENTS ESD WARNING………………………….…….2 DISASSEMBLY PROCEDURE..………….18 LEAKAGE TESTING………………..……..3 AMPLIFIER BIAS ADJUSTMENT……...…21 BASIC SPECIFICATIONS…………….….…..4 BLOCK DIAGRAM………………………….22 FRONT PANEL CONTROLS………………...5 IC PINOUTS……………………………..….23 FRONT PANEL DISPLAY…………………….7 TRANSISTOR PINOUTS………..…..…….52 REAR PANEL CONNECTIONS……..….……9 ELECTRICAL PARTS LIST………..…..….53 REMOTE CONTROL FUNCTIONS……..…..11 PCB DRAWINGS……………………..……62...
  • Page 2 AVR125 Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field effect transistors and semiconductor "chip" components.

  • Page 3: Safety Precautions

    AVR125 SAFETY PRECAUTIONS The following check should be performed for the continued protection of the customer and service technician. LEAKAGE CURRENT CHECK Measure leakage current to a known earth ground (water pipe, conduit, etc.) by connecting a leakage current tester...
  • Page 4 Height measurement includes feet and chassis. All features and specifications are subject to change without notice. Harman Kardon is a registered trademark, and Power for the Digital Revolution is a trademark, of Harman Kardon, Inc. * Manufactured under license from Dolby Laboratories.

  • Page 5: Front Panel Controls

    AVR125 FRONT-PANEL CONTROLS ı Û Ò Ô Ù Ú  ˆ AVR 125 Ó AM/FM & 1 Main Power Switch ! Input Source Selector Ô Set Button 2 System Power Control @ Tuning Mode Selector  Input Indicators 3 Power Indicator # Digital Optical 3 Input Ò...
  • Page 6 AVR125 FRONT-PANEL CONTROLS % Video 3 Video Input Jacks: These jacks may be In Manual tuning mode, tap the button lightly and note the receiver. (See pages 7–8 for a complete explana- that the tuner will step up one frequency increment per tion of the Information Display.)

  • Page 7: Front Panel Information Display

    AVR125 FRONT-PANEL INFORMATION DISPLAY Q PO OPT 123 COAX 123 ANALOG AUTO TUNED ST PRESET SLEEP NIGHT PL II DSP VMAx NF LOGIC 7 CM F G H A Bitstream Indicators I Logic 7 Mode Indicators Q Tuned Indicator...
  • Page 8 AVR125 FRONT-PANEL INFORMATION DISPLAY remaining before the AVR 125 goes into the Standby mode. (See page 21 for more information.) O Memory Indicator: This indicator flashes when entering presets and other information into the tuner’s memory. P Stereo Indicator: This indicator lights when an FM station is being tuned in stereo.

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