TX-SR806/SA806
OPERATION CHECK-4
Condition of Protect Mode
Condition of Power Supply Voltage Control
Condition of Cooling Fan Operation
The unit will go into Protect Mode under the following conditions.
(T: Thermal sensor temperature)
The power supply voltage(VH or VL) for power amplifiers is changed by the relays: RL6901,06902 on NAAMP-9477.
VH > VL
T: Thermal sensor temperature
VOLH: The voltage at A/D input Pin #133 of Main microprocessor Q1016 (Refer to SD-3 and SD-7 of Schematic Diagrams).
The unit will go into Protect Mode in 24 hours after powered ON.
This condition is equivalent to OPERATION CHECK-2.
The cooling fans will stop or rotate under the following conditions.
Immediately at T <= -30 C
or
Immediately at T >= 110 C
or
After 10 minutes of 100 C > T > 110 C
1. Thermal condition
2. Time condition
The unit will go into Protect Mode if speaker output AC current >= 9 A /ch.
3. Current condition
VH: 0V < VOLH < 0.4V
VL: 0.4V < VOLH < 2.0V, 5 minutes
or
2.0V < VOLH < 3.3V, 5 seconds
or
T > 70 C, 3 minutes
VL: At all times.
Conditions:
Speaker imp. = 6 or 8 ohm
Speaker imp. = 4 ohm
MID
SPEED
MID
SPEED
MID
SPEED
MID
SPEED
MID
SPEED
HIGH
SPEED
HIGH
SPEED
LOW
SPEED
LOW
SPEED
LOW
SPEED
Thermal Sensor Temperature(T)
STOP
0V
55 C
62 C
73 C
0.4V
2.0V
3.3V
V
OLH
STOP
“VOLH=0.4V” is equivalent to 0.8W(8 ohm, 7 ch)
“VOLH=2.0V” is equivalent to Max power(8 ohm, 3 ch)
Note:
