Onkyo TX-SR804, Service Manual

Page: 4 / 237

TX-SR804/804E
OPERATION CHECK-2
SPEAKER PROTECT-2 (CURRENT DETECTION)
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
+
button until
" Test-4-35 " is displayed.
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.
[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.
T e s t - _
T e s t - 4 - 0 0
[When]
1. Exchange power transistors (Q6050 - Q6056, Q6060 - Q6066).
2. Exchange amplifier PC board ass'y (NAAF-8678, NAAF-8682).
T e s t - 4 - 3 5
C l e a r
Turn off
7. Press STANDBY/ON
button.
T e s t - 4 - 3 5
P r o t e c t
T e s t - 4 - 3 5
Blinks
FL FR C SL SR SBL SBR