Mitsubishi Electric PD-4265, Руководство по обслуживанию

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PD-5065/PD-4265 Series Blockdiagram of the control block
Video S
W
Vide
o/s
y
n
c
SW
POWER un
it
REM
O
T
E
C
O
N
T
ROL
L
RS
232C c
o
n
tr
o
l
TEMP I
C
con
tr
o
l
KEY
con
tr
o
l
LED
AUDIO
con
tr
o
l
ALARM
AUDIO
PWB
232C P
W
B
SENB P
W
B
SENC P
W
B
SEND PW
B
CTL
PWB
LED
PWB
Video
ch
rom
a
D
ecod
e
r
Po
wer ON/OFF
CN-PN Pin3
APL
CNT
/
M
o
d
e
C
N
T
CN-AD
Pin3
MAI
N
P
W
B
Po
wer ON Reset
La
st m
e
m
o
ry
CN-PD Pin1 (3V)
CN-PD Pin 3
Timer data
OS
D IC
Ex
ten
si
on
Po
rt
IC
D
igi
tal
s
ig
nal
Pr
o
ce
ssi
ng bl
oc
k
I-
P c
o
nve
rter
S
cal
in
g
γ
co
rr
ect
io
n
D
oubl
e pi
c pr
o
ce
ss
in
g
CP
U
PD
P
MO
D
U
LE
LP
F
A/
D
RES
ET
I
C
E2
P
R
O
M
RTC
I
C
3.
3V
de
tect
PD
Red LED flashing : Abnormal temperature (95
°
C or higher)
Green LED flashing at 00 sec inter
vals:
Abnor
mality in the temper
ature 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.
5.2.2 CPU BLOCK
PD-5065
120