HT-R940
OPERATION CHECK-2
SPEAKER PROTECT
-2 (CURRENT DETECTION)
1. Press and hold down
CD
button, then press
STANDBY/ON
button while the unit is powered 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 the 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 the 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 "
is 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.
Do not check two or more channels at the same time.
Do not connect a dummy load to speaker terminal 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-8779).
T e s t - 4 - 3 5
C l e a r
Turn off
7. Press the
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
