OPERATION CHECK-2
SPEAKER PROTECT-2 (CURRENT DETECTION)
HT-R508
T e s t - _
T e s t - 4 - 0 0
[When]
1. Exchange power transistors (Q6050 - Q6054, Q6060 - Q6064).
2. Exchange amplifier PC board ass'y (NAAF-8779).
<Note>
1. No input.
2. Do not check two or more channels at the same time.
3. Do not connect a dummy load to speaker terminal longer than 2 seconds.
[Procedure]
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
AUX
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, check 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, check 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.
7. Press the
STANDBY/ON
button.
T e s t - 4 - 3 5
C l e a r
Standby
T e s t - 4 - 3 5
P r o t e c t
T e s t - 4 - 3 5
Blinks
FL display
