Pioneer PDP-4270XA Service Manual page 169

5
Fan and temperature sensor
Circuit diagram
MAIN Assy
SENSOR
FAN
1
Specifications for port monitoring
Port Name SD/PD Indication Assigned Pin
FAN_NG 1 FAN
Abnormally high
TEMP2
temperature in the
MR
Abnormally high
TEMP0
temperature in the
Drive circuit
DTB antenna power supply
Circuit diagram
R07 DT Assy
Overcurrent
ON/OFF
ANT
H: ON
L: OFF
Specifications for port monitoring
Port Name SD/PD Indication Assigned Pin
ANT_POW_EU DTB antenna short
5
6
TEMP2
Drive
FAN_12V
Circuit
V+3V_COM
SENSOR Assy
TEMP0
SENSOR
Shutdown with H
Shutdown when the
value exceeds the
predetermined value
Shutdown when the
value exceeds the
predetermined value
POWER
SUPPLY
Unit
MAIN Assy
V+5.1V_STB
Detection
Latch
Hold "L" at
the short-circuit.
IF_37 Warning with L
6
7
V+3V_COM
PULL_U
FAN_CONT_POW
PULL_U
FAN_NG1 (H act)
DIGITAL Assy
V+3V_COM
PULL_U
Active
V+3.3V_STB
ANT_POW_B
Inverter
H: OFF
L: ON
ANT_POW_EU
Monitoring
Active
PDP-427XD
7
8
TEMP2
FAN.CONT
MAIN_UCOM
FAN_NG
Detection
Logic
TEMP2
MODULE_
UCOM
IF_UCOM MAIN_UCOM
8
A
B
C
D
E
F
169