Onkyo TX-SR503, Service Manual

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OPERATION CHECK-1
SPEAKER PROTECT-1 (DC VOLTAGE DETECTION)
TX-SR503/503E/8350
1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON.
" Test - _ "
is displays it only for
5
seconds.
2. Press the
VIDEO 3
button, while the character of
" Test - _ "
is displayed.
Unit will be in the state of " Test-4-00 ".
3. Repeatedly press TONE+ button until the character of " Test-4-21 " is displayed.
[Procedure]
<Note>
No load. No input.
T e s t - _
T e s t - 4 - 0 0
[When]
1. Exchange power transistors (Q6050 - Q6066).
2. Exchange amplifier PC board ass'y (NAAF-8523).
T e s t - 4 - 2 1
Checking the operation starts automatically as follows.
T e s t - 4 - 2 1
T e s t - 4 - 2 2
T e s t - 4 - 2 5
T e s t - 4 - 2 3
T e s t - 4 - 2 4
P r o t e c t O K
P r o t e c t O K
P r o t e c t
P r o t e c t O K
P r o t e c t O K
P r o t e c t O K
T e s t - 4 - 3 5
C l e a r
Turn off
Front L ch
Check
If all channel are OK, the character of
" Test - 4 - 35 "
is displayed.
4. Press the
STANDBY/ON
button.
Front R ch
Check
Center ch
Check
Surround L ch
Check
Surround R ch
Check
Blinks
T e s t - 4 - 2 6
P r o t e c t O K
Surround Back L ch
Check
T e s t - 4 - 2 7
P r o t e c t O K
Surround Back R ch
Check