Onkyo TX-SR502 Service Bulletin
The countermeasure against ic oscillation
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Also See for TX-SR502:
- Service manual (118 pages) ,
- Instruction manual (60 pages) ,
- Service manual (118 pages)
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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
Parts No.
C6412
394741007
Marking: No change
Application:
TX-SR502(B) MDD, MDC
HT-R520(B) MDD, MDC #1-
HT-R520(S) MDD, MDC #1-
Description
ELECT C
CE04W16V10M
SERVICE BULLETIN
NO:04003
After change
Parts No.
Description
394743317
ELECT C
CE04W16V330M
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Summary of Contents for Onkyo TX-SR502
- Page 1 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.
- Page 2 TX-SR502 SERVICE BULLETIN No.04003 The countermeasure against IC oscillation. TOP VIEW Preamplifier PC board NADG-8230 Front heat sink disconnect Q6406 fix with bond heat sink connect remove C6412 Q6406 heat sink side Electrolytic Capacitor Visual Check 330uF 16V 1. Check if the capacitor is properly connected to the 394743317 IC considering polarity.