Pioneer PDP-424MV Service Manual page 38

(1) Power failure
(1)The power supply is
not turned on.
Move the main power
setting for OFF Ø ON.
Is the POWER/STANDBY
lamp lit?
YES
(2) Blinking in green
(Alarm of temperature
sensor error or fan
error)Go to (P8-3)
(3) Blinking in red after
repeating reciprocal flash
in red and green (POWER
ON OFF) 3times (Alarm of
temperature error) Go to
(P8-5).
(4) Reciprocal flashing in
red and green (Alarm of
panel error) Go to (P8-6).
(5) Lighting in green, and
then in red (Alarm of
power line error) Go to
(P8-6). (P8-7).
Is a 5Vdc output available in the state
that the LD connector is disconnected
and the main power is turned ON?
The LD connector
YES
or the LED PWB is
NO fault.
Is a 5Vdc output available in the
state thatthe RS connector is
disconnected and the main power is
turned ON?
The RS connector or
YES
the 232C PWB is
NO
fault.
The PW connector, PWR PWB or the
MAIN PWB is fault.
38
(Caution) If any abnormality is sensed in such a manner that the LED flashes
or lights, all the power lines other than those of 7Vdc (M+7V) and
5Vdc (M+5V) are automatically turned off in about 10 seconds.
When checking the power lines other than those of M+7V and
M+5V, a circuit tester or the like should have been connected in
advance. Is the AC power output available at the AC connector
Is the AC power output
NO
available at the AC connector
(power cord)?
YES
Is a 6.8Vdc output
available at Pin 1 of the
PM connector?
YES
Is a 6.8Vdc output available at
Pin 1 of the PW connector?
The PW
NO
connector or the PWR
PWB is fault.
YES
Is a 6.8Vdc output available at
Pin 6 of the PM connector?
NO
The PM connector or
the MAIN PWB is
YES
fault.
Is a 4.9Vdc output
available at Pin 3 of the
PM connector?
NO
YES
Is a 5Vdc output available at
Pin 4 of the PW connector?
NO YES
The MAIN PWB is fault.
8-2
NO
The power cord is
defective.
Is a 6.8Vdc output available in the
state that the LD connector is
NO
disconnected and the main power is
turned ON?
The LD connector
YES
or the LED PWB is
fault.
NO
Is a 6.8Vdc output available in the state
that the PW connector is disconnected
and the main power is turned ON?
The PW connector or
YES
the PWR PWB is
fault.
NO
Is a 6.8Vdc output available in the state
that the PM connector is disconnected
and the main power is turned ON?
YES
The PM connector or
the MAIN PWB is
fault.
NO
The power unit is
fault.