Specification About The Thermal Protection - Pioneer PDP-5071PU Service Manual

1
10.5

SPECIFICATION ABOUT THE THERMAL PROTECTION

∗ The change of HI / LO have hysterisis curve below.
Reading Value of The Sensor and FAN Drive.
A
T4
(Outside air 131F)
T3
(Outside air 100F)
T2
(Outside air 94F)
B
T1
(Outside air 82F)
T0
(Outside air 77F)
FAN: STOP FAN: LO
Pin 76
C
Operation when executing FAN control command
When executing [FCNS00], [FCNS01], [FCNS02] command, detect the FAN_NG signal. When NG is detected,
it becomes shutdown. When [FCNS03] command is executed, FAN_NG detection is not operated.
Pin 149
(FAN_CONT)
D
Pin 17
(FAN_CONT_POW)
Set State and FAN Drive
Power
ON
OFF
[ Outline Circuit ]
E
F
188
1
2
FAN: HIGH
AD Value
Assign
10bit
TEMP2 T4 setting 424
T3 setting 566
T2 setting 601
T1 setting 653
T0 setting 679
Assign FAN: HIGH FAN: LO
H
H
PSW1 State
ON ON According to the reading value of above table sensor.
STB FAN_CONT: "L"
H : Vo = 11V
L : Vo = 7.6V
17
U-COM
149
FAN_CONT
2
3
FAN: LO FAN: STOP
AD Value Sensor
8bit Temp. (Outside Air)
106 268F
142 104F
150 97F
163 86F
170 80F
OFF This model control the FAN drive by pin 149 (FAN ON / OFF)
and pin 17 (Change of FAN control voltage) of MAIN U-com.
H
L
–
L
Control
Vo
FAN_vcc
15
REG
Vref = 2.64V
47
33
H: On
L: Off
PDP-5071PU
3
4
FAN: LO FAN: HIGH
Aims
131F SD
Low → High
100F
High → Low
94F
STOP → Low
82F
Low → STOP
77F
Fan Operation
HIGH or LO
OFF
4
SD