Integra DTR-7.7 Service Manual page 6

OPERATION CHECK-4
CONTROL OF COOLING FAN
[When]
1. Exchange power transistors (Q6050 - Q6056, Q6060 - Q6066).
2. Exchange power amplifier PC board ass'y (NAAF-8678, NAAF-8682).
3. Exchange thermal sensor PC board ass'y (NAETC-8680).
4. Exchange cooling fan.
[Procedure]
1. Confirm that the cooling fan doses not rotate at no audio input signals.
2. Press and hold down CD button, then press STANDBY/ON button while the unit is Power ON.
" Test - _ " will be displayed.
3. Press VIDEO 3 button while " Test - _ " is displayed. The unit will be in the state of " Test-4-00 ".
4. Repeatedly press TONE
cooling fan rotates in low speed.
+
5. Press TONE button and confirm that the
+
6. Press TONE button two times and confirm that the
7. Press the STANDBY/ON button.
T e s t - _
Blinks
T e s t - 4 - 0 0
+
button until " Test-4-36 " is displayed. Then confirm that the
T e s t - 4 -3 6
cooling fan rotates in low speed.
T e s t - 4 -3 7
T e s t - 4 - 3 9
C l e a r
cooling fan rotates in fast speed.
Turn off
DTR-7.7