Specification About The Thermal Protection - Pioneer PDP-4270XA Service Manual

5

10.5 SPECIFICATION ABOUT THE THERMAL PROTECTION

∗ The change of HI / LO have hysterisis curve below.
Reading Value of the Sensor and FAN Drive
T4
(Outside air
55 ºC)
T3
(Outside air
40 ºC)
T2
(Outside air
37 ºC)
T1
(Outside air
33 ºC)
T0
(Outside air
30 ºC)
FAN: STOP FAN: LO
Assign
T4 setting
T3 setting
Pin 76 TEMP2 T2 setting
T1 setting
T0 setting
Assign
Pin 149 (FAN_CONT)
Pin 17 (FAN_CONT_POW)
Unit State and Fan Drive
POWER PSW1 State
ON ON ON
ON ON DT_REC
−
OFF STB
[System block diagram]
MAIN UCOM
149
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.
5
6
FAN: HIGH FAN: LO
AD Value Aims
10 bit (Sensor Position)
440 55 ºC
568 40 ºC
592 37 ºC
627 33 ºC
653 30 ºC
FAN: HIGH FAN: LO
H H
H L
Control
According to the reading value of above table sensor.
According to the reading value of above table sensor.
FAN_CONT: "L"
Vref=2.64V
H: Vo = 9.5 V
L: Vo = 7 V
17
PDP-427XD
6
7
FAN: STOP
Aims
(Outside Air)
55 ºC
40 ºC
37 ºC
33 ºC
30 ºC
STOP
L
−
FAN Operation
HIGH or LO
HIGH or LO
OFF
Vo
FAN_Vcc
REG
H: On
L: Off
7
8
FAN: LO FAN: HIGH SD
8
A
B
C
D
E
F
167