NEC PlasmaSync PX-42M2A, Service Manual

Page: 83 / 197

4-1
TROUBLE SHOOTING
No energization of POWER circuit
Is POWER LED NO Is the power plug correctly NO Rearrange the power plug
lit? connected to the wall outlet? connection correctly.
YES YES
Is there AC 100V behind the NO Fuses F1 and F2 have blown
fuses F1 and F2? out.
Green flashing: To 1 (Page 4-2) If the fuses blow out again after
Red flashing: To 2 (Page 4-2) replacement, the POWER unit
Green and red flashing: To 3 (Page 4-3) is out of order.
Green lighting: To 4 (Page 4-3)
YES
Is there M+15V output at NO Disconnect the PM and PQ
Pin
1
of the PM connector? connectors from one after an-
other. If there is M+14V output,
the circuit beyond the connec-
tors is out of order. If there is no
output, the POWER unit is out
of order.
YES
Is there +5V output at Pin
2
NO Failure in SW2001 (CTL PWB)
of IC6805 (ANALOG PWB)? and related circuits.
YES
Is there +5V output at Pin
5
NO Failure in +5V line as far as
of the PW connector? POWER PWB
YES
Is there +5V output at Pin
3
NO Failure in peripheral area of
of the PW connector? IC6800 (ANALOG PWB).
YES
Failure in POWER PWB