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TX-SR875 OPERATION CHECK-2
SPEAKER PROTECT-2 (CURRENT DETECTION)
[When] 1. Exchange the power transistors (Q6050 - 6056, Q6060 - 6066, Q6080 - 6086, Q6090 - 6096). 2. Exchange the amplifier PC board ass'y (NAAMP-9061, 9062, NACLA-9063 - 9069). [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.
Te st - _
Blinks
2. Press GAME/TV button, while " Test - _ " is displayed. The unit will be in the state of " Test-4-00 ".
Te st - 4- 00
3. Repeatedly press TONE + button until " Test-4-36 " is displayed.
Te st - 4- 36
4. Connect the dummy load of 3 ohms to the Front L ch speaker terminal. At this time, confirm that the speaker relay is not turned off.
Te st - 4- 36
5. Connect the dummy load of 1 ohm to the Front L ch speaker terminal. At this time, confirm that the speaker relay is turned off and " Protect " is displayed.
P r otect
Disconnect the dummy load immediately after checking the display of " Protect ".
Te st - 4- 36
6. Check other channels according to the same procedure as 4 and 5. Front R, Center, Surround L, Surround R, Surround Back L, Surroun R 7. Press STANDBY/ON button.
Turn off
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