HT-R540 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.
Test - _
Blinks
2. Press VIDEO 3 button, while " Test - _ " is displayed. The unit will be in the state of " Test-4-00 ".
Test - 4-00
3. Repeatedly press +(TONE) button until " Test-4-35 " is displayed.
Test - 4-35
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.
Test - 4-35
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.
Protect
Disconnect the dummy load immediately after checking the display of " Protect ".
Test - 4-35
6. Check other channels according to the same procedure as 4 and 5. 7. Press the STANDBY/ON button. Turn off
