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DTR-7.7 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-8678, NAAF-8682).
[Procedure]
<Note> No input signal. Do not check two or more channels at the same time. Do not connect a dummy load to speaker terminals longer than 2 seconds. 1. Press and hold down CD button, then press STANDBY/ON button while the unit is Power 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 a 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 a 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 " will bev displayed.
Pr otect
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. FL FR C SL SR SBL SBR
7. Press STANDBY/ON button. Turn off
Cl ear
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