Diagnosis - Mitsubishi Electric PD-4265 Service Manual

2.2 DIAGNOSIS

1. Power failure
(1) Power failure
(1)The power supply is
not turned on.
Disconnect the power cord.
Connect the power cord.
Is the POWER/STANDBY
lamp lit?
(2) Blinking in green
(Alarm of temperature
sensor error or fan
error)Go to (P19, P20 )
(3) Blinking in red after
repeating reciprocal flash
in red and green (POWER
ON OFF) 3times (Alarm of
temperature error) Go to
(P21).
(4) Alternation blinking in
red and green (Alarm of
panel error) Go to
(P22).
(5) Lighting in green, and
then in red (Alarm of
power line error) Go to
(P23).
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, or the MAIN PWB
is fault.
18
(Caution) If any abnormality is sensed in such a manner that the LED flashes
Is the AC power output
NO
available at the AC connector
(power cord)?
YES
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?
YES
Is a 6.8Vdc output available at
Pin 6 of the PM connector?
YES
Is a 4.9Vdc output
available at Pin 3 of the
PM connector?
NO
Is a 5Vdc output available at
Pin 4 of the PW connector?
NO
The MAIN PWB is fault.
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
NO
Is a 6.8Vdc output available in the
state that the LD connector is
NO
disconnected and the main power is
turned ON?
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 is
NO
fault.
Is a 6.8Vdc output available in the state
that the PM connector is disconnected
and the main power is turned ON?
NO
The PM connector or
the MAIN PWB is
fault.
YES
YES
PD-5065
The power cord is
defective.
The LD connector
YES
or the LED PWB is
fault.
NO
The PW connector is
YES
fault.
NO
YES
The PM connector or
the MAIN PWB is
fault.
NO
The power unit is
fault.