Circuit Configuration - Onkyo HT-R960 Service Manual

OPERATION CHECK-1
SPEAKER PROTECT-1

Circuit configuration

The unit go into protect mode when either of thermal detection, dc voltage detection or current detection circuit operates.
Power amplifier
Q6070
FL
Q6071
FR
Q6072
C
Q6073
SL
Q6074
SR
Q6075
SBL
Q6076
SBR
Condition to operate
The unit will go into the Protect mode under the following conditions.
1. Thermal condition
T ( C) Thermal sensor temperature
100 <
-30 >
150 <
90 < (40 C when power on)
90 < (The unit powered on longer than 24 hours)
2. DC voltage condition
The sum of dc voltage of 7 channel speaker outputs is more than 7 V.
3. Current condition
The ac current of speaker outputs is more than 35 A.
This condition is equivalent to TEST-4-35 in OPERATION CHECK-3.
Thermal detection check
[When]
Exchange thermal sensor PC board ass'y (NAETC-9426).
[Procedure]
1. Press and hold down DISPLAY DISPLAY button, then press ON/STANDBY
The microprocessor version will be displayed for 3 seconds.
FL Display
V e r . 1 .0 2 / 0 8 4 0 8 A
<Ex.>
2. Press TONE TONE button while the version is displayed.
<Ex.>
0 0 0 0 3 3 F : x S :H
VOLH (V)
Voltage of VOLH port
3. Confirm that the displayed temperature is within +/-20 C from the ambient temperature.
4. Press ON/STANDBY button.
Cl e a r
VPRO : DC voltage detection
IPRO : Current detection
Thermal sensor
Q6380
THERMAL
+B
Q6703
IPRO
PROTECT
Q6702 Q6701
VPRO
--->
--->
--->
--->
--->
ON/STANDBY button when the unit is powered on.
T ( C)
Thermal sensor temperatuer
Turn off
136
Q701
Main Microprocessor
109 APOWER
123
Protect
On (after 10 min.)
On (immediately)
On (immediately)
On (immediately)
On (immediately)
State of cooling fan Power supply voltage of +/-B1
x : Stop H : VH (high voltage)
L : Low speed L : VL (low voltage)
H : High speed
TX-SR606
RL901
Power trans AC in
Q9002