Onkyo T 4130 Service Manual

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T-4130

SERIAL NO. 3254

ONKYO SERVICE MANUAL

SYNTHESIZED
FM STEREO/AM TUNER
MODEL T-4130

Black model
BUD, BUDN 120V AC, 60Hz
BUG 220V AC, SOHZ
BUW 120V/220V AC, 50/60HZ
BUQA 240V AC 50Hz
SAFETY-RELATED COMPONENT WARNINGH TABLE OF CONTENTS
COMPONENTS IDENTIFIED BY MARK A ON
THE SCHEMATIC DIAGRAM AND IN THE PARTS Specifications ............................ 2
LIST ARE CRITICAL FOR RISK OE FIRE AND Se vice d
ELECTRIC SHOCK. REPLACE THESE COMPOS B; k fro ms """"""""""""" 2
NENTS WITH ONKYO PARTS WHOSE PART 0C Wm ----------------------- 3
NUMBERS APPEAR AS SHOWN IN THIS Exploded View ---------------------------- 4
MANUAL Parts list ................................ 5
C RENT OR RESISTA CF Circuit description ......................... 6
MAKE LEAKAGE- UR . N . I
MEASUREMENTS To DETERMINE THAT EXPOSED 510:1? diagram OHC """""""""""" 8
PARTS ARE ACCEPTABLY INSULATED FROM 39 3 3W ---------------------------- 0
THE SUPPLY CIRCUIT BEFORE RETURNING Adjustment Procedures ..................... 12
THE APPLIANCE TO THE CUSTOMER, Pc board view/partslist
Display/ Switch ......................... 14
Main circuit View ....................... 14
Main cixcuit parts list ..................... 19
Schematic diagram ........................ 15

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SPECIFICATIONS

FM: 1 20V model Other models
Tuning Range: B7.9-107.9MH2(200kHz steps) 87.5-108.0MH2(50kRz, steps)
Usable Sensitivity: Mono: 11.2dBI, ZtOpVJHF 112 dBf, 1.0uV, lHF, 0.9uV, 7Sohms DIN
Stereo: 17.2dBi, 4.0;4V 2.0uV 750hm
SOdB Quieting Sensitivity: Mono: 16.1dBf, BtSpV 1.7uV 750hm
Stereo: 36.1dBf, 35 ,uV 17uV 750nm
Capture Ratio: 1.5dB 1t5dB
Image Rejection Ratio: 40dB 80dB
IF Rejection Ratio: 90dB 90dB
Signal-torNoise Ratio: Mono: 73dB Mono: 73dB
Stereo? 6MB Stereo: 66dB
ACA: SOdB lHF(i400kHz)
Selectivity: SSdB DIN(:300kHz, 40kHz devi.)
AM Suppression Ratio: 50dB 50dB
Harmonic Distortion: Mono: 0.1% Mono: 0.1%
Stereo: 0.2% Stereo: 02%
Frequency Response: 30*15,000Hz 11.5dB 30715.000Hz 11.5dB
Stereo Separation: dfldB at IkHz 40dB at lkHz
SOdB at 70*10,000Hz 30dB at 70-10.000Hz
Output voltage: SOOmV 750mV
Muting level: 17.2dBf. 4pV ZuV,750hm
AM:
Tuning Range: 530-1,620kHz(10kHz steps) 522-1.611kHZ(9kHZ Steps)
Usable Sensitivity: ZSpV 25/1V
Image Rejection Ratio: 40dB ME
IF Rejection Ratio: 30dB 30dB
Signalsto-Noise Ratio: 40dB 40dB
Harmonic Distortion: 0.8% 0.8%
Output voltage: l50mV 150mV
GENERAL:
Dimensions(W> 17-1/ "X2-13/16X10»9/16"
Weight: 3.0kg., 6.61bs.

Specifications and Ioatures are subject to change without notice.

SERVICE PROCEDURES

1.5afety-check out

(Only U.S.A, model)

After correcting the original service problem.perform
the following safety check before releasing the set to
the customer,

Connect the insulating-resistance tester between the
plug of power suuply cord and chassis,

Specifications: 3.3Mohm :10% at 500V.

2.Memroy preservation

This unit does not require memory preservation batteries.

A built-in memory power backup system preserves contents
of the memory during power failures and even when the
unit is unplugged. The unit must be plugged in and the
power switch turned on and off once in order to charge the
back-up system. Note that since this is not a permanent
memory.the power switch must be turned on and off a few
times each month to keep the backup system operative.
The period of time during which memory contents are
preserved after power has last been turned off varies
depending on climate and placement of the unit.

On the average, memory contents are protected over a
period of 3 to 4 weeks (a minimum of 2 weeks) after

the last time power has been tumed off. This period is
shorter when the unit is exposed to very high humidity or
used in an area with an extremely humid climate.

3. Change of FM/AM band step.

- 120V model 7

This model is not located the band selector switch.

if the FM band step is changed from 200kHz to SOkHz, add two
diodes (158133) to D706 and D707 on the display PC board.

It" the AM hand step is changed from kHz to QkHz, add a diode
(155133) to D718 on the display PC board.

-220V model -

This model is not located the band selector switch.

If the FM band step is changed from SOkHz to ZOOkHz, remove two
diodes (188133) to D706 and D707 on the display PC board.

If the AM band step is changed from 9kI-Iz to 10kHz, remove a
diode (185133) to D718 on the display PC board.