NEC PX-50XM4, Service Manual

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PX-42VM5/42VP5/42VR5/42XM3/42XR3/50XM4/50XR4/61XM3/61XR3 Series
No signal With signal
PN 1 D+3.3 0 3.3 3.3 0 0 0 -
POWER → MAIN
2 D+3.3 0 3.3 3.3 0 0 0
-
POWER → MAIN
3 D+3.3 0 3.3 3.3 0 0 0
-
POWER → MAIN
4 D.GND GND 0 0 0 0 0 0
-
-
5 D.GND GND 0 0 0 0 0 0
-
-
6 D.GND GND 0 0 0 0 0 0
-
-
7 D+2.5 0 2.5 2.5 0 0 0
-
POWER → MAIN
8 D+2.5 0 2.5 2.5 0 0 0
-
POWER → MAIN
9 D+2.5 0 2.5 2.5 0 0 0
-
POWER → MAIN
10 D.GND GND 0 0 0 0 0 0
-
-
11 D.GND GND 0 0 0 0 0 0
-
-
12 D.GND GND 0 0 0 0 0 0 - -
PM 1 M+7 6.8 6.8 6.8 6.8 6.8 6.8 -
POWER → MAIN
2 D.GND GND 0 0 0 0 0 0 - -
3 POWER Power control 0 4.9 4.9 0 0 0 -
MAIN → POWER
4 D.GND GND 0 0 0 0 0 0
-
-
5 POMUTE Mute signal for AC power OFF 4.8 4.8 4.8 4.8 4.8 4.8
4.8
→
- POWER → MAIN
6 SW7 Power start control 0 6.8 6.8 6.8 6.8 0
- POWER → MAIN
7
ＮＣ
Non-connection terminal - - - - - -
-
-
PV 1 A+12 12V power supply for analog circuits 0 12 12 0 0 0
- POWER
→
MAIN
2 A.GND GND 0 0 0 0 0 0 - -
3 A+6 6V power supply for analog circuits 0 6 6 0 0 0 -
POWER
→
MAIN
4 A+6 6V power supply for analog circuits 0 6 6 0 0 0 -
POWER → MAIN
5 A.GND GND 0 0 0 0 0 0 - -
6 A.GND GND 0 0 0 0 0 0 - -
7 NC Non-connection terminal - - - - - - - -
8 NC Non-connection terminal - - - - - - - -
AU 1 AU_L Audio signal L
CH
0 Selected input
signals are
output.
Selected input
signals are
output.
0 0 0 -
MAIN → AUDIO
2 GND GND 0 0 0 0 0 0 - -
3 AU_R Audio signal R
CH
0 Selected input
signals are
output.
Selected input
signals are
output.
0 0 0 -
MAIN → AUDIO
4 GND GND 0 0 0 0 0 0 - -
5 MUTE Mute signal of audio output 3.5
3.5 → 0 3.5 → 0
3.5
3.5 → 0
3.5
3.5 → - MAIN → AUDIO
6 SCL7 Clock line of the I2C bus 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.
0 0 0 -
MAIN → AUDIO
7 SDA7 Data line of the I2C bus 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.
1 1 0 -
MAIN → AUDIO
RS 1 M+5V 5V power supply for microcomputer 0 5 5 5 5 0
- MAIN → RS232C
2 TXD RS232 driver output 0 Clock signal
used during
data
transmission
(3.3Vac)
3.3Vdc when
no data are
received.
Clock signal
used during
data
transmission
(3.3Vac)
3.3Vdc when
no data are
received.
Clock signal
used during
data
transmission
(3.3Vac)
3.3Vdc when
no data are
received.
Clock signal
used during
data
transmission
(3.3Vac)
3.3Vdc when
no data are
received.
0
-
MAIN
→
RS232C
3 GND GND 0 0 0 0 0 0 - -
4 RXD RS232 receiver input 0 Clock signal
(3.3Vac) when
data are
received;
3.3Vdc when
no data are
received.
Clock signal
(3.3Vac) when
data are
received;
3.3Vdc when
no data are
received.
Clock signal
(3.3Vac) when
data are
received;
3.3Vdc when
no data are
received.
Clock signal
(3.3Vac) when
data are
received;
3.3Vdc when
no data are
received.
0 -
RS232C
→
MAIN
5 M+3.3V 3.3V power supply for microcomputer 0 3.3 3.3 3.3 3.3 0 -
MAIN → RS232C
6 GND GND 0 0 0 0 0 0 - -
7 REMIN2/RXD
1
Data signal of
wired remote
control
42VM5
42VP5
42XM3
50XM4
61XM3
0 Clock signal
(3.3Vac) when
data are
received;
3.3Vdc when
no data are
received.
Clock signal
(3.3Vac) when
data are
received;
3.3Vdc when
no data are
received.
Clock signal
(3.3Vac) when
data are
received;
3.3Vdc when
no data are
received.
Clock signal
(3.3Vac) when
data are
received;
3.3Vdc when
no data are
received.
0 -
RS232C → MAIN
42VR5
42XR3
50XR4
61XR3
0 0 0 0 0 0 -
8 RESET SW NC - - - - - - - -
9 PLE_CTL PLE control 42VM5
42VP5
42XM3
50XM4
61XM3
0 3.3V duning
data
transmission
for Video
WOLL
0V when no
data are
transmitted
3.3V duning
data
transmission
for Video
WOLL
0V when no
data are
transmitted
3.3V duning
data
transmission
for Video
WOLL
0V when no
data are
transmitted
0 0 -
MAIN → RS232C
42VR5
42XR3
50XR4
61XR3
0 0 0 0 0 0 -
10 TXD1 RS232 driver
output
42VM5
42VP5
42XM3
50XM4
61XM3
0 Clock signal
used during
data
transmission
(5Vac) 5Vdc
when no data
are
transmitted.
Clock signal
used during
data
transmission
(5Vac) 5Vdc
when no data
are
transmitted.
Clock signal
used during
data
transmission
(5Vac) 5Vdc
when no data
are
transmitted.
0 0 -
MAIN
→
RS232C
2.5V power supply for digital circuits
2.5V power supply for digital circuits
7V power supply for microcomputer
Signal direction
Main power ON
(POWER button ON) ★
Pin No. Pin name Function
Standby
★★★
Power
management
★★
2.5V power supply for digital circuits
Main power
OFF
★★
(Caution) The operating voltages specified below are used in common irrespective of the presence of signals. In this case, however, part of the operating voltages (red characters) may change according
to the signal conditions when the main power supply is turned on (POWER button ON).
Status of LED lighting: ★ for lighting in green, ★★ for unlighting, and ★★★ for lighting in red.
Vol.1
3.3V power supply for digital circuits
3.3V power supply for digital circuits
3.3V power supply for digital circuits
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
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CONNECTOR PIN EXPLANATION
CONFIDENTIAL
11-1