NEC VT440 Service Manual

Also see for MultiSync VT440: User manual Installation data Specifications User manual

NEC VT440 Service Manual Manual pdf 41 page image

4-1TROUBLESHOOTINGOperational checksBy making checks on operation under normal working conditions, a certain degree of fault diagnosis can becarried out. Prior to removing the top cover, make the following checks:• Is the POWER indicator lit in orange color in the standby state?NO • The POWER cord is disconnected.• Problem in the power supply.• The cable (POPM) is disconnected.• Fuses (F3100 to F3104) of the MAIN PWB have blown out.• Failure in the CPU peripheral circuits of the MAIN PWB.• Clogging around the air filter.• Deviation from the working range and the temperature-condition range.•The cable (bimetal) is disconnected.YES• Is the STATUS indicator flashing?YES • The lamp fails to light.[Flashing at the intervals of once every 12 seconds (6-second ON/6-second OFF)]• The filter cover or the lamp cover is dislodged.[Flashing at the intervals of 1 second (0.5-second ON/0.5-second OFF)]• The fan is stopped due to the fan being out of order or intrusion of foreign substance.[Flashing at the intervals of once every 8 seconds (4-second ON/4-second OFF)]• The cable (POLM) is disconnected.[Flashing at the intervals of once every 12 seconds (6-second ON/6-second OFF)]• The cables (POF1, POF2) are disconnected.[Flashing at the intervals of once every 8 seconds (4-second ON/4-second OFF)]• The cable (POMK) is disconnected.[Flashing at the intervals of 1 second (0.5-second ON/0.5-second OFF)]• Lamp is out of order.[Flashing at the intervals of once every 12 seconds (6-second ON/6-second OFF)]NO• Is the STATUS indicator lit?YES • The total lamp lighting time has exceeded 2000 hours, or the data are destroyed.NO• Is the POWER indicator lit in green with POWER ON?YES • The lamp’s life has expired. (The STATUS indicator is lit in red.)• Failure in I/O PWB and MAIN PWB.• The cables (POMI, POXV, POXT, PORX, POGX, POBX) are disconnected.• The LC panel is out of order.NO• Peripheral circuits are out of order around the cabinet switch, remote control, remote control light receiver, andCPU.tttttttt