Power Supply And Dc-Dc Converter - Pioneer PDP-5020FD Service Manual

5

Power supply and DC-DC converter

Circuit configuration
POWER SUPPLY Unit
SW_REG
MAIN
POWER
SW
OR
RELAY1
MODULE_Ucom
DIGITAL ASSY
Specifications for port monitoring
Port Name SD/PD Indication
RST2 ASIC power
(M-DCDC)
RST3 AC power
RST4 MAIN power
(RELAY)
5
6
V+3_4V_ACT
AC_DET
Inverter
V+12V
V+6.5V
PULL_U
PULL_D
V+6_5V
PULL_U
PULL_D
DC/DC Converter
Active Monitoring conditions
Shutdown occurs when the
• Panel screen ON
signal is "L."
(RST4 = H and PSW1 = H)
for 5 sec after PSW1 is ON.
• While awaiting restoration
or
of RST2 (RST2 = L)
for 2 sec while the unit is
ON.
AC_OFF when the signal is Excepting passive standby
"H."
Shutdown occurs if the RELAY2 = ON (High)
signal is "L."
for 5 sec after RELAY2 is
ON.
or
for 2 sec while the unit is
ON or in Functional STB.
PDP-5020FD
6
7
MAIN Assy
RST3
V+3_4V_D
RST4
AND
V+5_1V
V+3_4V_D3
PULL_U
V+3_4V_ACT2
PULL_D
RST2
AND
PSW1
RELAY2
Command
Shutdown occurs immediately
Blue LED flashes 13 times
If "RST3 = H" (AC_OFF) is detected under the
monitoring conditions, a power-off process starts.
Monitoring of the RST3 port is continued, while
monitoring of other ports is interrupted.
Communication is controlled only by the IF
microcomputer. The port outputs are set as specified.
If the signal at the RST3 port continues to be H after
30 mS of waiting, monitoring is continued.
If RST3 is L, a restoration process starts according to
the latest power-on/-off status.
Shutdown occurs immediately
Blue LED flashes 13 times
7
8
MAIN_UCOM IF_UCOM
AC shutdown
detection
Voltage
detection
Startup
Main ucom ACTIVE
Voltage
detection
DC_DC Converter
output control
PON/POFF
Command
Operation
8
A
B
C
D
E
F
85