Onkyo ht-r540 Service Manual page 4

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OPERATION CHECK-2
SPEAKER PROTECT-2 (CURRENT DETECTION)
[When]
1. Exchange power transistors (Q6050 - Q6056, Q6060 - Q6066).
2. Exchange amplifier PC board ass'y (NAAF-8779).
[Procedure]
<Note> No input.
Do not check two or more channels at the same time.
Do not connect a dummy load to speaker terminal longer than 2 seconds.
1. Press and hold down CD button, then press STANDBY/ON button while the unit is powered on.
" Test - _ " is displayed only for 5 seconds.
2. Press VIDEO 3 button, while " Test - _ " is displayed.
The unit will be in the state of " Test-4-00 ".
3. Repeatedly press +(TONE) button until " Test-4-35 " is displayed.
4. Connect the dummy load of 3 ohms to the Front L ch speaker terminals.
At this time, confirm that the speaker relay is not turned off.
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L 13942296513
5. Connect the dummy load of 1 ohm to the Front L ch speaker terminals.
At this time, confirm that the speaker relay is turned off and " Protect " is displayed.
Disconnect the dummy load immediately after checking the display of " Protect ".
6. Check other channels according to the same procedure as 4 and 5.
7. Press the STANDBY/ON button.
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T e s t - _
Blinks
T e s t - 4 - 0 0
T e s t - 4 - 3 5
T e s t - 4 - 3 5
P r o te c t
T e s t - 4 - 3 5
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8
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3 6 7 1 3 1 5
Turn off
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HT-R540
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