Integra DTR-7.8 Service Manual page 212

QQ
3 7 63 1515 0
OPERATION CHECK-4
Condition of Protect Mode
The unit will go into Protect mode under the following conditions.
(T: Thermal sensor temperature)
1. Thermal condition
Immediately T <= -30 C
or
Immediately T > 110 C
2. DC voltage condition
The sum of dc voltage of 7 channel speaker outputs is more than 7 V.
3. Current condition
Protect will be On if speaker output ac current >= 35 A
Protect will not be On if speaker output ac current >= 11.7 A
This condition is equivalent to OPERATION CHECK-2. Refer to the page 2.
Test wave form:
Condition of Power Supply Voltage Control
TE
L 13942296513
The power supply voltage(VH, VM or VL) for power amplifiers is changed by the relays: RL6601, 6602, 6611, 6612 on NAPS-9040.
VH > VM > VL
T : Thermal sensor temperature
VOLH : Pin #99 input voltage of Main microprocessor: Q7001 (Refer to SD-4:D5 and SD-8:D2 of SCHEMATIC DIAGRAMS)
Conditions:
Condition of Cooling Fan Operation
The cooling fan will stop or rotate under the following conditions.
www
.
http://www.xiaoyu163.com
2 msec 2 msec
Speaker imp. = 6 or 8 ohm
VH: 0V < VOLH < 0.4V
and
T < 85 C
VM: 0.4V < VOLH < 2.0V
and
T < 85 C
VL: 2.0V < VOLH < 3.3V(Vcc)
and
T < 85 C
VL: T > 85 C
Thermal Sensor Temperature(T)
60 C 70 C
0V
STOP
STOP
SPEED
0.4V
x ao
y
MID
STOP
SPEED SPEED
i
2.0V
MID
HIGH
SPEED
SPEED
SPEED
http://www.xiaoyu163.com
8
20 msec
Q Q
3 6 7 1 3
Speaker imp. = 4 ohm or BTL
VM: 0V < VOLH < 0.4V
T < 85 C
VL: 0.4V < VOLH < 2.0V
T < 85 C
VL: 2.0V < VOLH < 3.3V(Vcc)
T < 85 C
VL: T > 85 C
Note:
"VOLH=0.4V" is equivalent to 0.8W(8 ohm, 7 ch)
80 C
"VOLH=2.0V" is equivalent to Max power(8 ohm, 3 ch)
MID
LOW
SPEED
u163
HIGH
HIGH
SPEED
.
HIGH
HIGH
SPEED
2 9 9 4 2 8
1 5 0 5 8 2 9 9 4
and
and
and
m
co
DTR-7.8
9 9
2 8 9 9