Circuit Description - NEC PX-50XM4 series Service Manual

CIRCUIT DESCRIPTION

Power supply (Common to all models)
When the power cord is connected to a wall outlet, M+7V (7Vdc) begins to be fed to IC9503 (M+3.3V) from
Pin 1 of the PM connector. When the main power switch (S2601) is turned on, IC9503 is turned on by
means of SW7 (M+7V) and M+3.3V (3.3Vdc) is fed to the CPU (IC9501). With the power supply of M+3.3V,
the CPU feeds the POWER signal [H] to the power unit from Pin 3 of the PM connector. As a result,
power supplies of the signal system (D+5V, D+3.3V, D+2.5V, A+12V, A+6V, S+12V) are turned on so that
power can be fed to the respective circuits of the signal system. After the power has been fed to the signal
system, the power supplies for the high-voltage system [Vs, Vd
the PDP (plasma display panel).
POWER
Input
Rectifier
PowerF
Filter
Circuit
actor
AC
Circuit
Input
(Caution 1) The standard voltages of Vd
and Vs for each model are specified
below. These values can, however, differ
according to the PDP specifications.
PX-42VP4 Series Vs=170V, Vd=60V
PX-42XM2 Series Vs=190V, Vd=65V
PX-50XM3 Series Vs=195V, Vd=64V
PX-61XM2 Series Vs=175V, Vd=65V
(Caution2)
PX-42VP4 Series T4
PX-42XM2 Series T4
PX-50XM3 Series T4/5
PX-61XM2 Series T4/5
(Caution 1) ] are generated and fed to
Sequence
circuit
T1
M+7V
A+12V
S+12V
A+6V
T2
D+5V
D+2.5V
D+3.3V
(Caution 2)
T4
VS
T5
Vd
T3
GND
AC IN
(AC Connector 1, 2pin)
POMUTE
(PM Connector 5pin)
M+7V
(PM Connector 1pin)
M+3.3V
SW7(PM Connector
6pin) (S2601)
S2601
M+3.3V
(PW Connector 4pin)
POWER
(PM Connector 3pin)
D+5V
(PH Connector 1,2pin)
* PX-61XM2 Series only
(PD Connector 4pin, PH Connector 7pin)
A+12V
(PV Connector 1pin)
S+12V
(PA Connector 1~3pin)
A+6V (PV Connector
3,4pin) VDD+5V
(TM Connector 3pin)
D+2.5V
(PN Connector 7~9pin)
D+3.3V
(PN Connector 1~3pin)
Vs
(PD Connector 9,10pin)
* PX-61XM2 Series only
(PD Connector 9, 10pin, PH Connector 1, 2pin)
Vd
(PD Connector 6, 7pin)
* PX-61XM2 Series only
(PD Connector 7pin, PH Connector 4pin)
ALARM
(PD Connector 1pin)
CONFIDENTIAL
14-1