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Yamaha DSP-AX640 User Manual

Yamaha DSP-AX640
152 pages
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SERVICE MANUAL
100847
IMPORTANT NOTICE
This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.
It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are already
known and understood by the users, and have therefore not been restated.
WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in personal
injury, destruction of expensive components, and failure of the product to perform as specified. For these reasons,
we advise all YAMAHA product owners that any service required should be performed by an authorized
YAMAHA Retailer or the appointed service representative.
IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute authorization, certification or
recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form.
The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and
service departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore, inevitable
and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please
contact the distributor's Service Division.
WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may have
accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).
IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.
P.O.Box 1, Hamamatsu, Japan
CONTENTS
TO SERVICE PERSONNEL .......................................... 2
IMPEDANCE SELECTOR ............................................. 2
FRONT PANELS ........................................................ 3~5
REAR PANELS ........................................................ 6~12
REMOTE CONTROL PANELS.................................... 13
SPECIFICATIONS / 参考仕様 ................................ 14~17
INTERNAL VIEW ......................................................... 18
DISASSEMBLY PROCEDURES/分解手順 ......... 19~22
SELF DIAGNOSIS FUNCTION (DIAG)/
自己診断機能(ダイアグ)..................................... 23~44
AMP ADJUSTMENT/アンプ部調整 ........................... 45
DISPLAY DATA ..................................................... 46~47
IC DATA ................................................................. 48~53
BLOCK DIAGRAM ................................................. 54~55
PRINTED CIRCUIT BOARD .................................. 56~79
PIN CONNECTION DIAGRAM .................................... 80
SCHEMATIC DIAGRAM ........................................ 81~92
PARTS LIST ......................................................... 93~147
REMOTE CONTROL.......................................... 148~152
AV RECEIVER/AV AMPLIFIER
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
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Yamaha DSP-AX640 Specifications

General IconGeneral
TypeAV Receiver
Channels6.1
Amplifier TypeDiscrete
Input Sensitivity/Impedance200 mV/47 kΩ
Audio DecodersDolby Digital, DTS, Dolby Pro Logic II
Analog Inputs5
HDMINo
Digital audio inputYes
Output Power per Channel100W
Frequency Response10 Hz - 100 kHz
Total Harmonic Distortion0.06%
Signal-to-Noise Ratio100 dB
Speaker Impedance6 ohms
Surround Sound ProcessingDolby Digital, DTS
Digital Inputs2 Optical, 2 Coaxial
Dimensions (W x H x D)435 x 171 x 413 mm

Summary

SERVICE PERSONNEL AND IMPEDANCE SELECTOR

TO SERVICE PERSONNEL

Information for authorized service personnel regarding critical components and safety procedures.

Leakage Current Measurement

Post-service test for insulation and leakage current limits to ensure safety.

SPECIFICATIONS

Audio Section

Detailed specifications for the audio amplifier section, including output power and frequency response.

DISASSEMBLY PROCEDURES

Top Cover Removal

Step-by-step instructions for removing the top cover of the unit.

DSP P.C.B. Removal

Step-by-step instructions for removing the DSP P.C.B. and its support.

FUNCTION P.C.B.s and Tuner Removal

Instructions for removing various FUNCTION P.C.B.s and the tuner.

MAIN and POWER P.C.B.s Removal

Instructions for removing the MAIN and POWER P.C.B.s.

Front Panel Removal

Instructions for removing the front panel unit.

Sub Chassis Removal

Procedures for removing the sub chassis and side plates.

SELF DIAGNOSIS FUNCTION (DIAG)

DIAG Menu Items

Lists the 15 diagnostic menu items and their sub-menu items for troubleshooting.

DIAG Menu Items (Continued)

Continues the list of diagnostic menu items and their sub-menu items.

Starting DIAG

Instructions on how to initiate the DIAG mode by pressing specific keys on the main unit.

DIAG Start Display

Explains the display output when DIAG is initiated, including version and menu list.

Protection due to Abnormal DC Output

Explanation of protection triggered by abnormal DC output from the power amplifier.

Functions in DIAG Mode

Lists functions available while operating in DIAG mode, such as input selection and level adjustment.

Starting DIAG in Protection Cancel Mode

Procedure to enter DIAG mode with protection functions disabled to aid diagnosis.

No Protection History Display

Describes the display when no protection function history is present.

Protection due to Heat Sink Over-temperature

Explanation of protection triggered by excessive heat sink temperature.

Canceling DIAG

Steps to take before canceling DIAG, including setting PRESET and turning off the power.

Protection History Display

Describes the display when protection function history exists.

Protection due to Abnormal Power Supply Voltage

Explanation of protection triggered by abnormal power supply voltage.

DIAG Menu and Sub-menu Operation

Explains how to navigate and select menu items and sub-menus within the DIAG function.

DIAG Menu Details

1. DSP THROUGH Modes

Explains DSP through modes like ANALOG BYPASS, YSS 0dB, YSS Front 0dB, including head margin characteristics.

YSS FULL BIT and YSS FULL BIT F

Describes digital full-bit output without head margin and SWFR signal output.

2. RAM THROUGH

Information about RAM throughput for YSS938, outputting CT signal through Sub DSP-DRAM.

3. PRO LOGIC Modes

Details Pro-Logic processing for L/C/R/RL/RR signals, outputting C/RL/RR via Sub DSP-DRAM.

Neo:6 Mode

Explains Neo:6 processing by CS49329 and output via Sub DSP-DRAM; fixed to Cinema 6ch mode.

4. SPEAKERS SET

Describes how input signals are identified and switched based on priority.

5. MARGIN CHECK

Explains signal output including head margin, with specific checks for MAIN 12dB and 18dB.

6. OTHER INPUT / EXTERNAL DECODER

Describes signal input through 6CH INPUT terminals and outputting to EXTERNAL DECODER.

8. MANUAL TEST

Noise generator outputs test signals through specified channels, with details on frequency and output.

10. AD DATA CHECK/FAN TEST

Displays A/D conversion values for terminals detecting panel keys and protection functions.

IMP SW/POWER LIMIT

Information on impedance switch and power limiter detection values.

11. IF STATUS (Input function status)

Displays status data of the microprocessor in hexadecimal notation.

Signal Processing Status (<5th byte>)

Details signal processing status, including mute request, DTS flashing, and analog mute.

12. DSP RAM CHECK

Self-diagnosis of bus connection for YSS938 and external RAM.

14. SOFT SW

Switches function settings on P.C.B. via software to activate the product.

15. MICROPROCESSOR INFORMATION

Displays microprocessor version, checksum, and specified port status.

7. DISPLAY CHECK

Program to check the FL display section, including various display states and signal processing.

9. FACTORY PRESET

Menu to reserve and inhibit initialization of backup RAM, with options for PRESET INHIBIT and PRESET RESERVED.

K0/K1 (Panel key)

Checks the functionality of panel keys and how to verify their constants.

Channel Status Information (CS1-5)

Displays channel status information of the input signal (IEC60958).

13. SD DL CODE

Displays data version of FLASH ROM, TOC information, and sum calculated value for the second decoder.

DOLBY DIGITAL Bit Stream Information (BY1-4)

Displays information of the bit stream included in the DOLBY DIGITAL signal.

dts Bit Stream Information (BS1-5)

Displays information of the bit stream included in the dts signal.

AMP ADJUSTMENT

BLOCK DIAGRAM (1/2)

BLOCK DIAGRAM (2/2)

SCHEMATIC DIAGRAM (DSP)

SCHEMATIC DIAGRAM (FUNCTION 1/2)

SCHEMATIC DIAGRAM (FUNCTION 2/2)

SCHEMATIC DIAGRAM (OPERATION)

SCHEMATIC DIAGRAM (VIDEO)

SCHEMATIC DIAGRAM (MAIN)

SCHEMATIC DIAGRAM (POWER)

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