TX-SR304/304E OPERATION CHECK-2
SPEAKER PROTECT-2 (CURRENT DETECTION)
[When] 1. Exchange power IC (Q6001, Q6002). 2. Exchange amplifier PC board ass'y (NAAF-8745). [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-4-29 " is displayed.
Test - 4- 29
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- 29
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.
P rotect
Disconnect the dummy load immediately after checking the display of " Protect ".
Test - 4- 29
6. Check other channels according to the same procedure as 4 and 5. FL FR C SL SR SW Turn off
