Integra DTR-4.9 Service Manual page 74

QQ
3 7 63 1515 0
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
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)
TE
L 13942296513
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
The microprocessor version will be displayed for 3 seconds.
FL Display
<Ex.>
2. Press Tone Tone button while the version is displayed.
<Ex.>
VOLH (V)
Voltage of VOLH port
3. Confirm that the displayed temperature is within +/-20 C from the ambient temperature.
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4. Press On/Standby button.
Cl e a r
.
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VPRO : DC voltage detection
IPRO : Current detection
Thermal sensor
Q6380
+B
Q6703
IPRO
Q6702 Q6701
VPRO
Display button, then press On/Standby On/Standby button when the unit is powered on.
M a in 1 .0 3 /0 8 6 3 0 A
0 0 0 0 3 3 F : x S :H
T ( C)
Thermal sensor temperatuer
x ao
y
i
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8
THERMAL
136
Q701
Main Microprocessor
PROTECT
109
Protect
--->
On (after 10 min.)
--->
On (immediately)
--->
On (immediately)
--->
On (immediately)
--->
On (immediately)
Q Q
3 6 7 1 3
State of cooling fan
x : Stop
L : Low speed
H : High speed
Turn off
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.
2 9 9 4 2 8
RL901
Power trans
Q9002
APOWER
123
1 5 0 5 8 2 9 9 4
Power supply voltage of +/-B1
H : VH (high voltage)
L : VL (low voltage)
m
co
DTR-4.9
9 9
AC in
2 8 9 9