Pioneer PDP-424MV Service Manual page 43

(5) Lighting in green, and then in red (Alarm of power voltage error)
Unlike [lighting in red] in the STANDBY mode, [lighting in green] continues for about 30 seconds without any output
of images and audio signals. Since then, the mode turns into [lighting in red].
Lighting in red
Make an OFF → ON setting
twice for the main power
supply in order to reset the
alarming condition.
Is the LED lit in red after it
has been lit in green for about
30 seconds?
YES
When the main power supply is turned on in
the state that the AD, PD, and PH connectors
are disconnected, are there the Vs (170Vdc)
and Vd (60Vdc) outputs at Pins 6-7to Pins
9-0 of the PD connector and a 5Vdc output
at Pins 1-2 of the PH connector?
In this case, is the LED not turned in red after
it has been lit in green for about 30 seconds?
At that time, however, no images are
generated.
NO
When the main power supply is turned on in
the state that the PA and PV connectors are
disconnected from one after another, is there a
12Vdc output at Pins 1-3 of the PA connector
or the 12Vdc and 6Vdc outputs at Pins 1 and
3-4 of the PV connector? In this case, is the
LED not turned in red after it has been lit in
green for about 30 seconds?
NO
Is there an output of 3.3Vdc available at Pins
1~3 and 2.5Vdc at Pins 7~9 in the state
that the PA and PV connectors are returned to
the former state, the main power is turned ON,
and the PN connector is disconnected? In this
case, however, this check must be finished in
30 seconds. Otherwise, there will be power
tripping on account of an alarm.
YES
The MAIN PWB is fault.
(Caution) How to reset the alarming condition The
alarming condition can be reset when an
OFF→ON setting is repeated twice for the main
power supply in the state that the LED is lit in
red. The interval between the first and second
settings is not particularly specified.
NO
Refer to P7-1
"HOW TO DIAGNOSE THE PDP MODULE".
YES
(Caution)
YES
The MAIN PWB or the
AUDIO PWB is fault.
NO
The Power unit or the
PN connector is fault.
8-7
Normal
The PDP is fault.
The voltage values of Vd and Vs
can differ according to the PDP. The
method of checking these voltage
values is obtainable from
[2. Adjustment of the power unit] in
the method of adjustment.
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