DTR-7.9
OPERATION CHECK-2
SPEAKER PROTECT-2 (SPEAKER OUT CURRENT DETECTION)
1. Press and hold down
CD
button, then press
ON/STANDBY
button while the unit is powered ON.
" Test - _ " is displayed only for 5 seconds.
2. Press GAME/TV button, while " Test - _ " is displayed.
The unit will be in the state of "
Test-4-00
".
3. Repeatedly press
TONE
+
button until
" Test-4-36 " is displayed. DSP outputs the pulse signal to all channels. Refer to Fig-1.
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.
5. Connect the dummy load of
1
ohm to the Front L ch speaker terminals.
Front R, Center, Surround L, Surround R, Surround Back L, Surround R
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 procedures as 4 and 5.
[Procedure]
<Note>
No input.
Do not check two or more channels at the same time.
Do not connect a dummy load to speaker terminals longer than 2 seconds.
Test - _
Test - 4-00
[When]
Test - 4-36
Clear
Turn off
7. Press
ON/STANDBY button to finish.
Test - 4-36
Protect
Test - 4-36
Blinks
1. Exchange power transistors (Q6050 - 6056, Q6060 - 6066).
2. Exchange amplifier PC board ass'y (NAAMP-9477, NACLA-9493).
2 msec
2 msec
20 msec
Fig-1 Current detection test signal
DSP output max.
DSP output max.
w
w
w
.
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1
6
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9
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8
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E
L
1
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9
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2
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6
5
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3
9
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0
5
1
5
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Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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