Operation Check - Integra DTR-5.9 Service Manual

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OPERATION CHECK-3

SPEAKER PROTECT-3
Current detection check
[When]
1. Exchange power transistors (Q6050 - Q6056, Q6060 - Q6066).
2. Exchange amplifier PC board ass'y (NAAF-9424).
[Procedure]
Notes : 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 On/Standby button while the unit is powered on.
" Test - _ " is displayed only for 5 seconds.
FL Display
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-4-35 " is displayed.
The shape of wave form of <Fig-1> is output from the speaker terminal in this state.
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.
TE
L 13942296513
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.
Disconnect the dummy load immediately after checking the display of " Protect ".
6. Check other channels according to the same procedure as 4 and 5.
7. Press the On/Standbby button.
<Fig-1>
Test wave form
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T e s t - _
Blinks
T e s t - 4 - 0 0
T e s t - 4 - 3 5
T e s t - 4 - 3 5
P r o te c t
T e s t - 4 - 3 5
C l e a r
2 mS 2 mS
20 mS
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2 9
8
Q Q
3 6 7 1 3 1 5
Turn off
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9 4 2 8
0 5 8 2 9 9 4 2 8
m
DTR-5.9
9 9
9 9