“Confidential, Do Not Duplicate without written authorization from NEC.”
4-1
Power supply is not available.
No
Is the LCD display presented? Examine possible cause (power supply)
and take actions.
Yes
Yes
Is an error display presented at the LCD? Examine the Error Code table and take actions.
No
Yes
Is the power supply available with the The PJKEY PWB is faulty or the connector is pulled
remote control? out.
No
No
Is the bulb entery? *1 Install the bulb. *1
TROUBLESHOOTING
The following possibility can be considered for the standing fault:
• Check POPS#5 of the PJDIV PWB. (DC power start control line)
When Standby is changed over to Power ON in normal operation, this line is maintained at the GND
potential.
If this GND condition is maintained in both Standby and Power ON modes, this error is considered
attributable to connector disconnection including the AC PWB of the connected party, or to AC PWB fault.
Similarly, if this GND condition is maintained in both Standby and Power ON modes, this error is considered
attributable to connector disconnection of POCE and POCS between PJDIV PWB and CPU PWB.
According to the symptom, take adequate measures such as replacement of the PWB or the like.
• Check POSTA of the PJDIV PWB.
(This is the connector that must be disconnected without fail when the top panel is removed at the time of
the installation.)
If the power supply is not turned on even when the connector is pulled out, check the POSTA connector
pin of the PJDIV PWB. If it is found broken, replace the PJDIV PWB.
If the connector is pulled out and the power supply is turned on, check the POSTA connector cable and
examine if wires are pinched by the metallic plate. As required, replace the connector cable.
• The connector is disconnected between the PJDIV PWB and the DC power supply.
•A fault in PJDIV PWB, CPU PWB, DC power supply, or AC PWB.
Possible causes (Power supply)
The following causes can be anticipated:
Confirm that 5V is applied to POPSS#7 of the PJDIV PWB.
When 5V output is not available:
Measure the resistance value between POPSS#7 and GND.
If there is no short-circuiting, this error is resulting from a fault in the DC power supply or a
connector disconnection between the DC power supply and the PJDIV PWB.
If there is short-circuiting, this error seems to be resulting from a fault in the DC power supply
and the CPU PWB.
When 5V output is available:
This error is supposed to have occurred from a connector disconnection between the CPU PWB
and the PJDIV PWB or between the CPU PWB and the PJKEY PWB.
*1: A 4kW bulb is loaded at the time of shipment from the factory.
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