Manual for AV-S70/NX-SW70

Manual for AV-S70/NX-SW70

Brand: YAMAHA

Category: Audio/Video

Document Type: Manual

Language: EN

Uploaded: Nov. 21, 2025, 7:25 p.m.

Warranty Information

Service manual provides technical information for authorized personnel; no warranty information is explicitly stated.

TO SERVICE PERSONNEL

  • Components with special characteristics are marked with a "!". They must be replaced with parts having specifications equal to the originals.
  • Ensure to ground yourself to the ground buss when handling sensitive components to discharge static electricity.
  • Turn the unit OFF before disassembly and part replacement. Recheck all work before applying power.

FRONT/REAR PANELS

  • Information on the front and rear panels of the AV-S70 is provided, including dimensions.
  • Details for the SW-AVS70 (Subwoofer) and NX-AVS70 (Rear Speaker) are also shown with dimensions.

SPECIFICATIONS

  • Detailed specifications for both AV-S70 (Amplifier Section, Speaker Section, General) and NX-SW70 (Amplifier Section, Rear Speaker Section, Sub Woofer Speaker Section, General) are listed.
  • Specifications include power output, signal-to-noise ratio, total harmonic distortion, input sensitivity, impedance, dimensions, weight, and finish.
  • Accessories for each unit are also listed.

DISASSEMBLY PROCEDURES

  • Step-by-step instructions for disassembling the AV-S70 and SW-AVS70 are provided, including diagrams and screw identification.

TEST PROGRAM MODE (AV-S70)

  • Instructions on how to start, select, and cancel test programs are given.
  • Details of various test program functions (e.g., DEST-B,G1, FL+CLEAR, FL CHECK, DSP Diag) are explained.

DSP DIAG MODE (Self-diagnosis)

  • Procedures for starting and navigating the DSP DIAG mode using the remote controller are outlined.
  • Main menus and sub-menus for diagnosis are listed, along with cancellation methods.

Details of DIAG menu

  • Detailed explanations and block diagrams are provided for various diagnostic menu items like "Analog Thr.", "DSP Through", "AC-3 Through", and "Pro Logic".

IC DATA

  • Pin configurations and functions for specific ICs (e.g., M30218FCFP, YM3436D) are presented.

BLOCK DIAGRAM

  • Block diagrams for the AV-S70 are provided for servicing purposes.

PARTS LIST

  • Comprehensive parts lists are included for mechanical parts, chip resistors, and components on various PCBs (AMP, DSP-FL).

REMOTE CONTROL TRANSMITTER

  • Schematic diagram and a table of key codes for the remote control are shown.

Troubleshooting and error codes

Display Function
04 DSP Diag The DSP DIAG (self-diagnosis) mode is initiated. (Refer to page 7 for the details.)
05 Ver-A1.08 Microprocessor version / date display Example of microprocessor display 05 Ver-A1.08 Example of microprocessor date display 05 '99.10.15 What is displayed varies depending on the microprocessor software.
06 SUM[4730] Check sum calculation display / re-calculation
07 PrCan-OFF All protection cancellation function ON/OFF
08 Pr!C_P_S_ Protection operation history display / clear : Center unit amplifier voltage F: Power circuit voltage : Switch side : Normal X: Abnormal
09 Cors- St. ROM collection (EEPROM) check sum calculation/calculation start When there is a data in the ROM collection area of EEPROM: * Example of display 09 Cors-288b When there is no data, "NON" appears on the display. The ROM collection (EEPROM) is utilized to cope with the data area for backup and microprocessor bugs partially. The backup memory for the sound field or the like will be retained semi-permanently even when the plug is disconnected. No data is written in the parts mounted on the product as single units.
10 COR-Clear ROM collection (EEPROM) data clear / clear start * Display is provided only when there is data in the ROM collection area of EEPROM 1st time: Data clear confirmation (Clear-ON displayed) 2nd time: Data clear execution (Clear: OK! displayed) After "Clear-ON?" is displayed, do not use INPUT key for execution (because the program contents will be erased). Using VOLUME + (UP) key and VOLUME - (DOWN) key, select another test program. * The IC for ROM collection has a role to help the microprocessor be upgraded. If the written data is cleared, the old version will be restored.
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