Onkyo T 4300 Service Manual
This is the 16 pages manual for Onkyo T 4300 Service Manual.
Read or download the pdf for free. If you want to contribute, please upload pdfs to audioservicemanuals.wetransfer.com.
Extracted text from Onkyo T 4300 Service Manual (Ocr-read)
Page 1
ONKYO
T-4300
Rel No,3371
SERVICE MANUAL
SYNTHESIZED
FM STEREO/AM TUNER
MODEL T-4300
Black model
BUDN, BUD 120v AC, 60 Hz
BUG 220v AC, 501-12
1 BUU. BUUX 110/120/220/24ov AC, 50/60Hz
I BUQA, BUQB 240v AC, 50 Hz
SAFETY-RELATED COMPONENT WARNING
COMPONENTS IDENTIFIED BY MARK A ON
THE SCHEMATIC DIAGRAM AND IN THE PARTS
LIST ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE THESE COMPO-
NENTS WITH ONKYO PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS
MANUAL
MAKE LEAKAGECURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM
THE SUPPLY CIRCUIT BEFORE RETURNING
THE APPLIANCE TO THE CUSTOMER
TABLE OF CONTENTS
Specificalions . _.
Sen/ice procedures
Block diagram . .
Exploded mew . . .
Parts 115: .
Block diagram of 1C
Packing new . .
Adjustment procedures
Pc board view/parts list
Mam crrcuxt . ............
Display/Operation switch
Schematic diagram . . ..
120V model
Other models .............
ONKYO
Alllllfl BflMPllNINIS
_1-
Page 2
300
SPECIFICATIONS
Total Harmonic Distortion Mono: 0.1%
Tuning Range' 87 9-lm,9MHz(200kHz steps: U.S.A model) 516160: 0 2%
87.5-108.0MH2(50kHz steps: European model) Freqiiency Response: 30-15, OOUHz i1.5dB
87.971(Y7.9MH2(200kHz steps) or Stereo Separation: 40d}?! at 1km
87 5-108 0MH2(50kH1 steps) (Vtorldwide model) 30dB at 7U-IO,DOOI{Z
Usable Sensitivity Mono. ll ZdBt, L0 lV IHF Muting Level: 2.0 #V, 750hm
0 9 IV 7'50th DIN I7 ZdBI. 4.01-V
Stereo: 2.0 V 75ohms Output Voltage: SOOmV [120V model)
Mono: 11,2dBf, 2 O I'V IHIF (120V model) 750mV (Other models)
Stereo: 17.2dBf, 4.0 #V (120V model) AM:
SOdB Quieting Sensitivity: Mono: 1.7 #V 75,0th Tuning Range S3(}l710kH2(10kl-l7 steps) (U S.A. model)
Stereo: l.7 FV 750hm5 522-lollkHz( 9H; steps) (European model)
Mono. lérldBf, 3.5 #V (120V model) 530*1620kH7(lOkHz steps) or
Stereo: 36.1dBi, 35 #V (120V model) 531-I602kHZ( 9kHZ steps) (Worldwide moch)
Capture Ratio: 1.5dB Usable Sensrrivny. 25 l V
Image Rejection Ratio: 40dB (120V model) Image Rejection Ratio- 40dB
80:13 (Other models) ' ' IF Rejection Ratio AOdB
[F Rejection Ratio: 90dB Signal-torNoise Ratio: 40dB
Signalvto-Noise Ratio: Mono 73dB Harmonic Distortion: 0.8%
Stereo: 66dB Output voltage: 150mV
Alternate Channel . GENERAL:
Attenuation SOdB [HF [ 400ka (120V model) Dimensions(W><}-I>
AM suppression Ratio SOdB Weight: 2 6kg . 5 7 lbs.
Specifications and tenturcs are subject to change without notice.
SERVICE PROCEDURES
1. Safety-cheek out
(Only U.S.A. model)
After correcting the original service problemperiorm
the following safety check before releasing the set to
the customer.
Connect the insulatingeresistance tester between the 4. Tuning Step Frequency Switch (Bapk Panel)
plug of power suuply cord and chassrs. W models are equipped with a switch for the AM (9kHZ/
Specifications 3,3Mohm :10? at 500.45 lOkHz) and FM (SOkHz/lOOkl-lz) bands. The switch
should be set to the proper steps for the radio broadcast
2, Memroy preservation frequencres in your area
This unit does not require memory preservation batteries.
A built-in memory power back-up system preserves contents 5. Changing the band step
0f the memory during DDWEY MINES and EVE when the With the exception of the models below, a BAND STEP
unit is unplugged, The unit must be plugged in and the
, . selector switch is not provided.
power swrtch turned on and off once in order to charge the
back-up system. Note that since this is not a pennanent FM
memory.the power switch must be turned on and off a few MODEL BAND erp ibiju
tIimes each month to keep the back-up system operative (U137 200kH-7 7% SOkl-izi Additional
he period of time during which memory contents are 1 . ,, ~ -
preserved after power has last been turned off varies WMZM Eliminated _i
depending on climate and placement of the unit,
On the average, memory contents are protected over a In D721/D723, 183133 (Part No. 223163) are used.
period of 3 to 4 weeks (a minimum of 2 weeks) after
the last time power has been turned off. This period is AM fl _
shorter when the unit is exposed to very high humidity or MODEL BANDleP 1
used in an area with an extremely humid climate W riltl'kHzggld-Iz- - Fliminfia
UG/UQ 9kHz +10kHz Additional
3. Voltage Selector (Back Panel)
W models are equtpped with a voltage selector to con-
form with local power supplies. Be sure to set this switch
to match the voltage of the power supply in your area
before turning the power switch on, This switch is set to 075:
220V at the factory. Voltage is changed by sliding the Q MICROPROCESSOR
groove in the switch with a screwdriver to the right or 0
left. Confirm that the switch has been moved all the way CD- c755
to the right or left before turning the power switch on :33 Super quucltor
Models without a voltage selector can only be used in
areas where the power supply is the same as that ofthe
DISPLAY CIRCUIT PC BOARD
unit.