NEC PlasmaSync 50MP1 User Manual page 69

(4) Lit in green
Can you hear the sound of
AC relay ON when the main
power circuit is turned ON?
YES
Does it take more than 5 seconds
when the main power circuit is
turned on and then turned off?
NO
Is the potential maintained at
the [H] level at Pin 3 of the PM
connector?
YES
Is the potential maintained at
the [H] level at Pin 1 of the PD
connector?
YES
Is the power supply available
when the PD, PH, and AD
connectors are disconnected?
NO
Disconnect the PV, PQ, PN, and PA connectors, one after another
(with all others kept connected), and check whether the power supply functions normally.
• When it functions: Failure in the circuit on the disconnected connector side.
• When it does not function: Failure in the POWER unit.
NO
Is the potential maintained at
the [H] level at Pin 79 of
IC9501 (MAIN PWB)?
Is the potential maintained at
the [H] level at Pin 3 of the
PM connector?
Failure in the POWER unit?
YES
IC9501 (MAIN PWB) and pe-
ripheral circuits are out of order.
NO
NO
Failure in the periphery of the
PDP module.
YES
Failure in the HV system of the
PDP module and the POWER
unit, or in the periphery of the
D+5V circuit.
5
NO
YES
NO
YES
IC9501 and peripheral
circuits are out of order.
Pull out the PM connector
and check the potential at
Pin 3 (MAIN PWB). If the
[H] level is perceived, the
POWER unit is out of order.
If the potential is kept at the
[L] level, IC9501 and periph-
eral circuits are out of order.