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AV RECIEVER Service Manual
TX-NR646 CONTENTS
Front Cover (This page)
Pre Issue (15-May) Note for Parts List
Final Issue (15-Jun) Panel
Reset
Amp Diag Mode after Abnormal Conditions
Model and Destination
Firmware
Adjustment ( Unnecessary )
Hookup and Setting
Trouble Shoot
Disassembly
Schematic Diagram
Exploded View
Appendix

SAFETY-RELATED COMPONENT WARNING!! : COMPONENTS IDENTIFIED BY 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 WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS MANUAL. MAKE LEAKAGE-CURRENT OR
RESISTANCE MESUREMENTS TO DETERMINE THAT EXPOSED PARTS ARE ACCEPTABLY
INSULATED FROM THE SUPPLY CIRCUIT BEFORE RETURNING THE APPLIANCE TO THE
CUSTOMER.




Published by Onkyo & Pioneer Corporation Grobal CS Department
1 2 3 4 5 6


File Name of Parts List File (EXCEL File) Note for Parts List

When parts list is EXCEL file, please refer to the following explanation about file name.

D D




PL_TX-SR343(B)MJJ.xlsx

Destination
Model No. Color Look at the rear panel serial number 6 digit.
J
C C

Voltage
Look at the rear panel serial number 5 digit.
J



Color Voltage Destination
(B) Black (LB) Light Blue J 100V AC J Japan Speaker System (without AMP.) :
(BR) Brown (M) Wood D 120V AC C North American L Left channel
B B
(C) Cherry (O) Orange M 220-240V AC D USA R Right channel
(G) Gold (P) Pink P 230V AC F Taiwan 0 Center channel
(GR) Green (R) Red U 100-240V AC S Brazil
(H) Gray (S) Silver Q Hong Kong
(K) Black (V) Violet Speaker System (without AMP.) : R China
(L) Blue (W) White 0 Passive Subwoofer A Australia
(Y) Yellow F Front Speaker B United Kingdom
C Center Speaker K Korea
R Rear Speaker L Russia
A A
B Back Speaker P Europe
U Worldwide


COMMON
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Front Panel / Rear Panel / Remote Control Unit Panel

Remote Control Unit
Front Panel
RC-898M
D D




C C




Rear Panel




B B




Accessory
Indoor FM antenna --- (1)
AM loop antenna --- (1)
Remote controller (RC-898M) --- (1)
Batteries (AA/R6) --- (2)
Power cord (Taiwanese models) --- (1)
Speaker setup microphone --- (1)
A A
The number in parenthesis indicates the quantity.
On packaging, the letter at the end of the product
name indicates the color.
Weight : 9.4 kg (20.7 lbs.) (North American and Taiwanese), 9.8 kg (21.6 lbs.) (Others)
Dimensions (W