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Onkyo CR-305TX - Service Manual

Onkyo CR-305TX
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CR-305TX
SERVICE MANUAL
CD RECEIVER
Silver model
MODEL CR-305TX
120V AC, 60Hz
220-230V AC, 50Hz
230-240V AC, 50Hz
UDD,UDT
UGT,UGR,
UPP
Ref. No. 3723
062002
RC-421S
DISPLAY
TUNING/PRESET
STANDBY/ON
MEMORY FM MODE
CLEAR
PHONES
A
C
O
U
S
T
I
C
P
R
E
S
E
N
C
E
INPUT
A
C
O
U
S
T
I
C
P
R
E
S
E
N
C
E
V
O
L
U
M
E
M
A
X
M
I
N
V
O
L
U
M
E
U
P
V
O
L
U
M
E
D
O
W
N
REMOTE CONTROLLER
STANDBY/ON
INPUT
TIMER ENTER
RANDOM
MEMORY REPEAT
CD
PLAY MODE
SLEEP
A.PRESENCE
CLOCK
CALL
MUTING
REPEAT
MD
VOLUME
PLAY MODE
REPEAT
TUNER
PRESET
CDR
TAPE
SCROLL
RC-421S
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
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.
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Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com

Other manuals for Onkyo CR-305TX

Questions and Answers

  • D
    David JohnsonAug 20, 2025
    Why is my Onkyo Car Receiver remote controller not working?
    • B
      Billy MccoyAug 20, 2025
      If the remote controller for your Onkyo Car Receiver isn't working, the batteries may be dead, the remote controller might be out of range, or there could be an obstruction between the remote controller and the unit. Try replacing the batteries with new ones, operating the remote controller within the control range, and from different angles, or removing any obstructions.
  • A
    Amy RobertsAug 22, 2025
    What to do if no sound from Onkyo CR-305TX Car Receiver speakers?
    • R
      Ricky BishopAug 22, 2025
      If sound is not reproduced from either the left or right speaker of your Onkyo Car Receiver, it could be due to several reasons: * The speaker wire might be touching other jacks, connectors, or metal parts. * The volume level might be set to the minimum. * The sound could be muted. * Headphones might be connected. Check the speaker connections, adjust the volume level, press the MUTING button on the remote controller, and disconnect any connected headphones after turning down the volume.
  • T
    Thomas RamirezAug 25, 2025
    Why does my Onkyo CR-305TX only play sound from one speaker?
    • W
      William PonceAug 25, 2025
      If sound is only coming from one speaker on your Onkyo Car Receiver, the speaker cord may not be connected properly, firmly, or may be disconnected. Check the speaker connections to ensure they are properly connected.
  • S
    sandraleeAug 26, 2025
    How to stop FM hiss on Onkyo CR-305TX?
    • C
      Christopher WalkerAug 26, 2025
      If the tuning indicators and stereo indicator flicker and you hear hiss on FM with your Onkyo Car Receiver, the station might be too weak, or stereo FM broadcasts might not reach as far as ordinary broadcasts. Try installing an outdoor FM antenna, changing the position or direction of the outdoor antenna, or switching to mono reception.
  • W
    William GriffinAug 28, 2025
    Why RDS function does not work on my Onkyo Car Receiver?
    • V
      Victoria HoltAug 28, 2025
      If the RDS function isn't working on your Onkyo Car Receiver, it could be because the station isn't an RDS station, the reception signal is too weak, or there's too much interference. Try tuning into an RDS station, installing an outdoor FM antenna and changing its position or direction, and moving the antenna away from fluorescent lamps.
  • J
    johnsonkyleAug 29, 2025
    What causes crackling noise on Onkyo Car Receiver AM/FM?
    • T
      Timothy GillAug 29, 2025
      Crackling noise on AM or FM with your Onkyo Car Receiver can be caused by turning a fluorescent lamp on and off, or noise from automobile ignition. Try moving the antenna as far away as possible from the fluorescent lamp, or install an outdoor FM antenna far away from the road.
  • M
    Michael RichardsAug 31, 2025
    How to stop Onkyo CR-305TX disc from skipping?
    • M
      mbrownAug 31, 2025
      If the disc skips sounds on your Onkyo Car Receiver, it could be due to vibrations, a severely scratched disc, or an extremely dirty disc. Place the unit in a vibration-free location, replace the disc with a new one, or clean the disc.
  • G
    Gary HenrySep 2, 2025
    How to reduce AM buzzing noise on Onkyo CR-305TX?
    • L
      Linda SolomonSep 2, 2025
      If you're experiencing buzzing noise on AM, especially at night or with weak stations, on your Onkyo Car Receiver, it could be due to noise from electrical apparatus such as a fluorescent lamp. Try moving the AM loop antenna to a different position, or setting up an outdoor AM antenna.
  • B
    Brett WatersSep 4, 2025
    Why is the sound distorted on my Onkyo Car Receiver?
    • Q
      qadamsSep 4, 2025
      If the tuning and stereo indicators are lit, but the sound is distorted and separation is poor on your Onkyo Car Receiver, the station might be too strong, or there could be multiple reflections of radio waves due to tall buildings or mountains. Try changing to an FM indoor antenna, or use an antenna with better directivity and select a point with the least distortion.
  • W
    Wayne FloresSep 6, 2025
    How to eliminate high-pitched noise on Onkyo CR-305TX Car Receiver AM?
    • G
      Gregory SpencerSep 6, 2025
      If you're hearing high-pitched or buzzing noise on AM with your Onkyo Car Receiver, it could be interference from a TV set. Place the AM loop antenna as far as possible from the TV, or move the unit away from the TV set.

Summary

Safety-Related Component Warning

Laser Safety Procedures

Service Warning

Critical warning regarding laser beam safety during servicing procedures.

Laser Warning Labels

Details about warning labels affixed to the unit for laser safety.

Service Procedures

Replacing the Fuses

Instructions for safely replacing fuses in the unit.

Initializing the Unit

Procedure to reset the unit to factory settings and clear memory.

Safety Check Out

Essential safety checks to perform after service, especially for US models.

Memory Preservation

Information on the unit's built-in memory backup system.

Changing the AM Band Step

Guide on how to modify the AM tuning step frequency.

Packing View

Parts List

List of parts included in the product packaging.

Printed Circuit Board Parts List - 1

U1: Audio PC Board (NAAF-6874)

Components list for the audio PC board.

U2: Power Supply PC Board (NAPS-6878)

Components list for the power supply PC board.

Printed Circuit Board Parts List - 2

U3: Front PC Board (NADIS-6879)

Components list for the front PC board.

U4: Amplifier PC Board (NAAF-6880)

Components list for the amplifier PC board.

U5: Speaker PC Board (NAETC-6881)

Components list for the speaker PC board.

U6: Digital Output PC Board (NAETC-6882)

Components list for the digital output PC board.

Printed Circuit Board Parts List - 3

U8: CD PC Board (NAAR-6875)

Components list for the CD PC board.

U9: Connector PC Board (NAETC-6883)

Components list for the connector PC board.

PC Board Connection Diagram

Schematic Diagrams - 1 (Amplifier & Power Supply)

Block Diagram

Exploded Views of Mechanism - 1

Parts List

List of mechanical parts for the CD mechanism.

Exploded Views of Mechanism - 2

Parts List

List of parts for the CD drive unit.

Exploded View Parts List - 1

Exploded View Parts List - 2

Exploded View

Panel View (Rear Panel)

U.S. and Canadian Models

Connection details specific to US and Canadian models.

Asian and European Models

Connection details for Asian and European models.

Optical Digital Audio Connector Cap

Instructions regarding the protective cap for the optical connector.

Schematic Diagrams - 1 (Amplifier & Power Supply)

Schematic Diagrams - 2 (CD & Microprocessor)

Onkyo CR-305TX Specifications

General IconGeneral
CategoryCar Receiver
BrandOnkyo
ModelCR-305TX
TypeCD Receiver
Channels2
FM TunerYes
AM TunerYes
Remote ControlYes
DIN Size1-DIN

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