NEC PX-50XM4, Service Manual

Page: 399 / 535

No signal With signal
Signal direction
Main power ON
(POWER button ON) ★
Pin No. Pin name Function
Standby
★★★
Power
management
★★
Main power
OFF
★★
AC power OFF
(Power cord
pulled out of
the wall outlet)
★★
AC power ON
(Power cord
connected to
the wall outlet)
★★
Basic operation (Numerical unit: Vdc; except for the case when units are individually indicated)
Name
20 RCLK+ Video system output clock+ 0 Video data
clock LVDS
serial
differential
clock+ output
0.3Vac; Bias
1.25Vdc
Video data
clock LVDS
serial
differential
clock+ output
0.3Vac; Bias
1.25Vdc
0 0 0 -
MAIN
→
PDP
21 RCLK- Video system output clock– 0 Video data
clock LVDS
serial
differential
clock- output
0.3Vac; Bias
1.25Vdc
Video data
clock LVDS
serial
differential
clock- output
0.3Vac; Bias
1.25Vdc
0 0 0 -
MAIN → PDP
22 GND GND 0 0 0 0 0 0 - -
23 RC+ Video system output C+ 0 Video data
LVDS serial
differential C+
output 0.3Vac;
Bias 1.25Vdc
Video data
LVDS serial
differential C+
output 0.3Vac;
Bias 1.25Vdc
0 0 0 -
MAIN
→
PDP
24 RC- Video system output C– 0 Video data
LVDS serial
differential C-
output 0.3Vac;
Bias 1.25Vdc
Video data
LVDS serial
differential C-
output 0.3Vac;
Bias 1.25Vdc
0 0 0 -
MAIN
→
PDP
25 RB+ Video system output B+ 0 Video data
LVDS serial
differential B+
output 0Vac;
Bias 1.1Vdc
Video data
LVDS serial
differential B+
output 0Vac;
Bias 1.1Vdc
0 0 0 -
MAIN → PDP
26 RB- Video system output B– 0 Video data
LVDS serial
differential B-
output 0Vac;
Bias 1.4Vdc
Video data
LVDS serial
differential B-
output 0.3Vac;
Bias 1.25Vdc
0 0 0 -
MAIN → PDP
27 RA+ Video system output A+ 0 Video data
LVDS serial
differential A+
output 0Vac;
Bias 1.1Vdc
Video data
LVDS serial
differential A+
output 0.3Vac;
Bias 1.25Vdc
0 0 0 -
MAIN → PDP
28 RA- Video system output A– 0 Video data
LVDS serial
differential A-
output 0Vac;
Bias 1.4Vdc
Video data
LVDS serial
differential A-
output 0.3Vac;
Bias 1.25Vdc
0 0 0 -
MAIN → PDP
29 GND GND 0 0 0 0 0 0 - -
30 GND GND 0 0 0 0 0 0 - -
31 GND GND 0 0 0 0 0 0 - -
LD 1 REMIN1 Infrared remote control data 0 Clock signal
(5Vac) when
data are
received; 5Vdc
when no data
are received.
Clock signal
(5Vac) when
data are
received; 5Vdc
when no data
are received.
Clock signal
(5Vac) when
data are
received; 5Vdc
when no data
are received.
Clock signal
(5Vac) when
data are
received; 5Vdc
when no data
are received.
0
-
LED → PWR
2 LEDCTL1 Standby red LED control 0 0 0 3.3 3.3 0 -
PWR
→
LED
3 LEDCTL2 POWER ON green LED control 0 3.3 3.3 0 0 0 -
PWR
→
LED
4 GND GND 0 0 0 0 0 0 - -
5 M+5V 5V power supply for microcomputer 0 5 5 5 5 0 -
PWR → LED
PW 1 SW7 Power start control 0 6.8 6.8 6.8 6.8 0 -
PW → MAIN
2 POIN Power start detection 0 3.3 3.3 3.3 3.3 0 -
PW → MAIN
3 GND GND 0 0 0 0 0 0 - -
4 M+5V 5V power supply for microcomputer 0 5 5 5 5 0
- MAIN → PW
5 M+7V 7V power supply for microcomputer 0 6.8 6.8 6.8 6.8 6.8
- MAIN → PW
6 REMIN1 Infrared remote control data 0 Clock signal
(5Vac) when
data are
received; 5Vdc
when no data
are received.
Clock signal
(5Vac) when
data are
received; 5Vdc
when no data
are received.
Clock signal
(5Vac) when
data are
received; 5Vdc
when no data
are received.
Clock signal
(5Vac) when
data are
received; 5Vdc
when no data
are received.
0 -
PW → MAIN
7 LEDCTL1 Standby red LED control 0 0 0 3.3 3.3 0
- MAIN → PW
8 LEDCTL2 POWER ON green LED control 0 3.3 3.3 0 0 0
-
MAIN
→
PW
SW 1 CTL1 Key input detection 0 0.7~2.8Vdc
when key
inputs are
entered;
3.3Vdc when
no key inputs
are entered.
0.7~2.8Vdc
when key
inputs are
entered;
3.3Vdc when
no key inputs
are entered.
0.7~2.8Vdc
when key
inputs are
entered;
3.3Vdc when
no key inputs
are entered.
0.7~2.8Vdc
when key
inputs are
entered;
3.3Vdc when
no key inputs
are entered.
0 -
SW
→
MAIN
2 CTL2 Key input detection 0 0.7~2.8Vdc
when key
inputs are
entered;
3.3Vdc when
no key inputs
are entered.
0.7~2.8Vdc
when key
inputs are
entered;
3.3Vdc when
no key inputs
are entered.
0.7~2.8Vdc
when key
inputs are
entered;
3.3Vdc when
no key inputs
are entered.
0.7~2.8Vdc
when key
inputs are
entered;
3.3Vdc when
no key inputs
are entered.
0 -
SW → MAIN
3 GND GND 0 0 0 0 0 0 - -
PA 1 S+12 +12V power supply for audio circuits 0 12 12 0 0 0 -
POWER → AUDIO
2 S+12 +12V power supply for audio circuits 0 12 12 0 0 0 -
POWER → AUDIO
3 S+12 +12V power supply for audio circuits 0 12 12 0 0 0 -
POWER → AUDIO
4 GND GND 0 0 0 0 0 0 - -
CONFIDENTIAL
11-5