Onkyo TXSR 502 Service Bulletin

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TX-SR502 SERVICE BULLETIN No.04003 The countermeasure against IC oscillation. bend cut hook IN OUT heat sink 1 Electrolytic Capacitor 330uF 16V 394743317 2 3 4 Q6406 IN OUT heat sink C6412 remove solder solderfix with bond 5 side Front Preamplifier PC board NADG-8230 side heat sink GND TOP VIEW TOP VIEW 8 7 6 Q6406 heat sink disconnect P7502 P7502 P7502 connect 9Visual Check 1. Check if the capacitor is properly connected to the IC considering polarity. 2. Check if soldering was done by using just enough quantity of solder and heat and there remains enough clearance between the capacitor and the other terminals or heat sink nearby. 3. Check if just enough bond is used to fix the capacitor and no bond is left around socket. 4. Check if FFC of P7502B is inserted in the socket in the right direction from the right angle. Operation Check Check if sound outputs properly when digital sound signal is input.