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Onkyo TX-SR502 Service Bulletin

Onkyo TX-SR502
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SERVICE BULLETIN
NO:04003
2004/04/21
MODELS : TX-SR502/502E/8250/HT-R520
SUBJECT : The countermeasure against IC oscillation.
Symptom:
TX-SR502's output sometimes has a hum with signals after power on within
few minutes.
When selector or DSP mode is switched to another at this moment, the protect
program starts.
Cause:
Oscillatation of IC regulator.
Procedure for service:
To exchange an electrolytic capacitor with that of 330uF for C6412 in NADG-
8230.
Circuit No. Before
change
After change
Parts No. Description Parts No. Description
C6412 394741007 ELECT C
CE04W16V10M
394743317 ELECT C
CE04W16V330M
Marking: No change
Application:
TX-SR502(B) MDD, MDC
HT-R520(B) MDD, MDC #1-
HT-R520(S) MDD, MDC #1-

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Onkyo TX-SR502 Specifications

General IconGeneral
Total Harmonic Distortion0.08 %
Input Sensitivity200 mV
Tuner BandsAM/FM
Preset Stations40
Power Output75 Watts
Frequency Response10Hz-100kHz
Amplifier Output Details75W per channel (8 ohms, 20Hz-20kHz, 0.08% THD)
Response Bandwidth10Hz-100kHz
Input Impedance47 kOhm
Built-in DecodersDolby Digital, DTS
Surround Sound EffectsDolby Pro Logic II
Width435 mm
Depth363 mm
Height151 mm
Speaker Impedance8 Ohm
Tuner TypeDigital
Remote ControlYes
Dimensions (W x H x D)435 x 151 x 363 mm

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