Onkyo TX-SR804 Service Manual page 4

OPERATION CHECK-2
SPEAKER PROTECT-2 (CURRENT DETECTION)
[When]
1. Exchange power transistors (Q6050 - Q6056, Q6060 - Q6066).
2. Exchange amplifier PC board ass'y (NAAF-8678, NAAF-8682).
[Procedure]
<Note>
No input signal.
Do not check two or more channels at the same time.
Do not connect a dummy load to speaker terminals longer than 2 seconds.
1. Press and hold down CD button, then press STANDBY/ON button while the unit is Power ON.
" Test - _ " is displayed only for 5 seconds.
2. Press VIDEO 3 button, while " Test - _ " is displayed.
The unit will be in the state of " Test-4-00 ".
3. Repeatedly press TONE
4. Connect a 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 a 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 " will bev 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.
FL FR
7. Press STANDBY/ON button.
T e s t - _
Blinks
T e s t - 4 - 0 0
+
button until " Test-4-35 " is displayed.
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 SL SR SBL
C l e a r
SBR
Turn off
TX-SR804/804E