Current Detection - Onkyo HT-R530 Service Manual

OPERATION CHECK-2
SPEAKER PROTECT-2 (CURRENT DETECTION)
[When]
1. Exchange power transistors (Q6050 - Q6066).
2. Exchange amplifier PC board ass'y (NAAF-8523).
[Procedure]
<Note>
No input.
Do not check two or more channels at the same time.
Do not connect dummy load to speaker terminals for seconds 2 or more.
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.
T e s t - _
2. Press the VIDEO 3 button, while the character of " Test - _ " is displayed.
Unit will be in the state of " Test-4-00 ".
T e s t - 4 - 0 0
+
3. Repeatedly press TONE
T e s t - 4 - 3 5
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.
T e s t - 4 - 3 5
5. Connect the dummy load of 1 ohm to the Front Lch speakers terminal.
At that time, check the speaker relay is turned off and " Protect " is displayed.
P ro te c t
Disconnect the dummy load at once when check the display of " Protect ".
T e s t - 4 - 3 5
6. Check other channels according to the same procedure.
7. Press the STANDBY/ON button.
Blinks
button until the character of " Test-4-35 " is displayed.
C l e a r
Turn off
HT-R530