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14-2
PDP-424MV/42MVE1 Series Blockdiagram of the control block
Video SW
Video/sync
SW
POWER unit
REMOTE CONTROLL
RS 232C control
TEMP IC control
KEY control
LED
AUDIO control
ALARM
AUDIO PWB
232C PWB
SENB PWB
SENC PWB
SEND PWB
CTL PWB
LED PWB
Video chroma Decoder
Loop out SW
Power ON/OFF
CN-PN
Pin3
APL CNT / Mode CNT
CN-AD
Pin3
MAIN PWB
Power ON Reset
Last memory
CN-PD
Pin1 (3V)
CN-PD
Pin 3
Timer data
OSD IC
Extension
Port IC
Digital signal
Processing block
I-P converter
Scaling
γ correction
Double pic processing
CPU
PDP
MODULE
LPF
A/D
RESET IC
E2PROM
RTC IC
3.3V detect
PD
Red LED flashing : Abnormal temperature (95°C or higher)
Green LED flashing at 00 sec intervals: Abnormality in the temperature sensor
Red LED lit : Power abnormality
Red and green LEDs flashing alternately : Module abnormality
If an abnormality is detected inside the PDP module, the voltage at the CN-AD
connector (3-pin) falls from 5 V to L. The red and green STB LEDs flash alternately,
and the unit enters STBY mode.
How to cancel the alarm: While holding the Input Select key pressed, set the
Main Power key to ON. Keep holding the Input Select key pressed for another
2 seconds or more, and the alarm will be canceled.
If temperature of 95°C or
higher is detected at
12CDATA, the red
STB LED flashes, and the
unit enters STBY mode.
How to cancel the alarm:
Turn the main power at the
main unit off then back on.
The alarm will be canceled.
If the voltage at Pin 1 of the CN-PD connector, which should be normally 3.3 V, falls to 2.5 V or
less for about 30 seconds, the CPU judges it as a power abnormality. Then the red STB LED l
ights, and the unit enters STBY mode.
How to cancel the alarm: Turn the main power at the main unit off then back on. The alarm will be canceled.
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