ONKYO SERVICE MANUAL

Product Variants

Available in Black, Silver, and Yellow models.

Safety Information

WARNING!! Components identified by a mark ⚠ on the schematic diagram and in the parts list are critical for risk of fire and electric shock. Replace these components with Onkyo parts only. Ensure exposed parts are acceptably insulated from the supply circuit before returning the appliance to the customer.

Exploded Views - Amplifier Section

This section provides an exploded view of the amplifier components.

Key Components:

• P901: Power cord
• A101, A102, A103: Various screws and brackets
• A02, A03, A04: Chassis parts
• A05, A05a: Screws
• SP11, SP12, SP13: Speaker terminals/connectors
• U01: Main PC Board (NAAF-8829)
• U02: Frequency Adjustment PC Board (NAAF-8830)
• U03: Power Transformer PC Board (NAPS-8831)
• U04: Voltage Selector PC Board (NASW-8832) - MWT type only
• U05: Power Switch PC Board (NASW-8833)
• F901, F901C: Fuse
• T901: Transformer
• Q501-Q519: Transistors
• R501-R544: Resistors
• C501-C528: Capacitors
• D501, D601-D603, D651: Diodes
• S901, S902: Switches
• P901, P902A, P903A, P905A, P905B, P906A, P906B, P907A, P908A, P910A, P911, P912, P301A, P301B, P501B, P531, P631, P632A, P633: Test points and connectors
• F902: Fuse

Refer to "EXPLODED VIEWS-2" for speaker section details.

Exploded Views - Speaker Section

This section provides an exploded view of the speaker components.

Key Components:

• SP01a-c: Speaker cabinet parts
• SP02, SP03, SP04: Screws
• SP05a/b: Speaker mounting hardware
• SP06: Speaker wire
• SP07a/b: Speaker driver
• SP08: Speaker wire
• SP09a-c: Rear panel/cover
• SP11: Screws

Schematic Diagram

This section contains the detailed schematic diagram of the main PC board (NAAF-8829).

The diagram illustrates the interconnections of various components including resistors (R), capacitors (C), transistors (Q), diodes (D), integrated circuits (U), and fuses (F).

Key sections of the diagram are labeled:

• A: Main PC Board
• B: NAAF-8829
• C: NAAF-8830 (Frequency Adjustment)
• D: NAAF-8833 (Power Switch)
• E: U02 Frequency Adjustment PC Board
• F: Phase Switch (S101)
• G: Notes and Cautions
• H: PC Board Identifications (U03, U04, U05)

Important Notes:

• Components marked with ⚠ are critical for safety.
• Voltage measurements are DC unless otherwise specified.
• Transistor types are specified (e.g., NJM4558LD, 2SA949-Y, 2SC2240-BL).
• Capacitor values are in uF/WV or pF/50WV.
• Resistor values are in Ohms (1/4 Watt) unless otherwise noted.
• Thick lines on PC boards indicate the printing side of the parts.
• Circuit design is subject to change for improvement.

Caution: For continued protection against fire hazard, replace fuses only with the same type and rating indicated.

Printed Circuit Board Views

This section provides visual layouts of the component sides of various PC boards:

• U01 Main PC Board (NAAF-8829): Detailed component layout.
• U03 Power Transformer PC Board (NAPS-8831): Component layout with fuse information and AC connections.
• U02 Frequency Adjustment PC Board (NAAF-8830): Component layout with adjustment points and switches.
• U04 Voltage Selector PC Board (NASW-8832): Component layout, noting it's for MWT type only.
• U05 Power Switch PC Board (NASW-8833): Component layout with switch and connector information.

Adjustment Procedure: Adjustment of Idling Current

[When]

• Exchange transistors (Q505 - Q519).
• Exchange MAIN PC board ass'y (NAAF-8829).

[Procedure]

1. Ensure no speaker load and no input signal.
2. Short test point P631 when the amplifier is active.
3. Adjust trimming resistor R544 so the multimeter reads 52 ohm to 53 ohm.
4. Connect a DC voltmeter to test point P531.
5. Connect the AC power cord to a wall outlet.
6. Press the POWER button to turn on the unit.
7. After 6 to 8 minutes of heat running, confirm the voltage at test point P531.
8. Voltage Adjustments:
   • If voltage is less than 3.20 mV: Readjust R544 for 4.5 mV to 5.0 mV.
   • If voltage is 3.30 mV to 5.20 mV: No adjustment needed.
   • If voltage is 5.21 mV to 10.0 mV: Readjust R544 for 5.0 mV to 5.5 mV.
   • If voltage is 10.1 mV to 20.0 mV: Readjust R544 for 5.6 mV to 6.0 mV.
9. Press the POWER button to turn off the unit.
10. Disconnect the DC voltmeter.
11. Disconnect the AC power cord from the wall outlet.

Diagrammatic Representation:

A diagram shows the main PC board "NAAF-8829" with test points P531 and P631, trimming resistor R544, and a DC voltmeter connection.

Packing Procedure

This section outlines the steps for packing the subwoofer for shipping.

Packaging Components:

• 01a-f: Outer box
• 02: Top packing foam
• 03: Bottom packing foam
• 04: Inner packing foam
• 05: Outer packing foam
• 07: Adhesive tape
• 08: Packing material
• 11: Accessory bag
• 12: Power cord (3m, Black/RCA)
• 13, 14, 15, 16: Accessory items (e.g., manuals, cables)
• 09: Printed labels/stickers
• 10a-d: Printed labels/stickers

The procedure involves placing the subwoofer into the protective foam and then into the outer box, securing it with tape.

Company Information

Contact information for various Onkyo divisions and offices is provided:

• ONKYO CORPORATION (Japan)
• ONKYO U.S.A. CORPORATION (USA) - Website: http://www.us.onkyo.com/
• ONKYO EUROPE ELECTRONICS GmbH (Germany) - Website: http://www.eu.onkyo.com/
• ONKYO EUROPE UK Office (UK)
• ONKYO CHINA LIMITED (Hong Kong) - Website: http://www.ch.onkyo.com/

General website: http://www.onkyo.com/