Integra DTR-7.6 Series Service Manual page 63

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ADJUSTMENT AND CONFIRMATION PROCEDURES 2
3. Confirmation of Current detection circuit
Set the unit to "Test- 1-00".
Connect the differentiating circuit and apply the 50Hz square signal to MULTI CHANNEL INPUT terminal
of each channel.
Adjust the attenuator or Volume so that the output level becomes 35V p-p.
Confirm that the speaker relay does not turn OFF when a 3.0 ohm load is connected.
Confirm that the speaker relay turns OFF when a 1.0 ohm load is connected.
CR
OSCILLATOR
50Hz
SQUARE
INPUT
3.3k
GND
TE
L 13942296513
Test Mode
1. Turn POWER button on.
2. Press and hold down CD button, then press STANDBY/ON button.
3. After "Test - " on the FL tube is displayed, press CD button to set the unit to the test mode of FL tube.
Note: DVD :Test- 1 VIDEO 1 :Test- 2
VIDEO 2 :Test- 3 VIDEO 3:Test- 4
Change of item
Tone + ....UP
Tone - ......DOWN
Check of unit by test mode
Voltage detection circuit
Set the unit to "Test- 4-21".
The microprocessor checks the output voltage of all channels automatically
When the output voltage is abnormal, "Protect NG" is displayed on FL tube.
When the voltage of all channels is normal, "Test- 4-35" is displayed on FL tube.
4-21:FL 4-22:FR 4-23:C 4-24:SL 4-25:SR 4-26:SBL 4-27:SBR
Current detection circuit
Set the unit to "Test- 4-35".
Connect the hollow resistor 3 ohm across the speaker terminal.
Check that the speaker relay turn On.
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When connect the hollow resistor 1.5 ohm, check that the speaker relay turn Off.
Note: Check the all channels.
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DIFFEREN-
ATTENU-
TIATING
ATOR
CIRCUIT
0.1 F
1SS133x6
10k
Differentiating Circuit
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2 9
8
MULTI
CHANNEL
SPEAKER
INPUT
TERMINAL
UNIT
3.3k
OUT-
PUT
0.01 F
Q Q
3 6 7 1 3 1 5
Test- X-YZ
co
.
9 4 2 8
OSCILLO-
SCOPE
35Vp-p
0 5 8 2 9 9 4 2 8
Item
m
DTR-7.6
9 9
9 9