Onkyo TX-SR804, Service Manual

Page: 6 / 237

TX-SR804/804E
OPERATION CHECK-4
CONTROL OF COOLING FAN
[Procedure]
[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).
1. Confirm that the cooling fan doses not rotate at no audio input signals.
T e s t - _
T e s t - 4 - 0 0
T e s t - 4 - 3 6
C l e a r
Turn off
Blinks
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
+
button until " Test-4-36 " is displayed. Then confirm that the
7. Press the STANDBY/ON button.
T e s t - 4 - 3 7
5. Press TONE
+
button and confirm that the
cooling fan rotates in low speed.
cooling fan rotates in low speed.
T e s t - 4 - 3 9
6. Press TONE
+
button two times and confirm that the
cooling fan rotates in fast speed.
4. Exchange cooling fan.