Onkyo TX-SR502 Reference manual

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-

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

solder

fix 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

9

Visual 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.

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