Onkyo TX-SR403, Руководство по обслуживанию

Страница: 7 / 149

OPERATION CHECK-2
SPEAKER PROTECT-2 (CURRENT DETECTION)
TX-SR403/8340
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-4-35 " is displayed.
4. Connect the Dummy load of 3 ohms to the Front Lch speakers terminal.
At this time, check the speaker relay is
not turned off
.
5. Connect the dummy load of
1
ohm to the Front Lch speakers terminal.
At that time, you check the speaker relay is turned off and " Protect " is displayed.
Disconnect the dummy load at once when check the display of " Protect " .
6. Check other channels according to the same procedure.
[Procedure]
<Note>
No input.
Do not check two or more channels at the same time.
Do not connect dummy load to speaker terminals fro seconds 2 or more.
T e s t - _
T e s t - 4 - 0 0
[When]
1. Exchange power transistors (Q6050 - Q6065).
2. Exchange amplifier PC board ass'y (NAAF-8523).
T e s t - 4 - 3 5
C l e a r
Turn off
7. Press the STANDBY/ON button.
T e s t - 4 - 3 5
P r o t e c t
T e s t - 4 - 3 5
Blinks