JVC 250 service manual Incoming Power Circuit, AC Power Cord, AC Circuit Breaker, AC EMI Filter

Chapter 3---Electrical

Left/Right Orientation: When referring to the left or right in this chapter, it is with reference to standing at the rear of the projector, facing the screen.

Connectors on subassemblies and PCBs have tabs that must be released first before pulling on the connector. The proper procedure is to push slightly IN on the connector, then squeeze the tab, then pull the connector out.

3.2.Incoming Power Circuit

AC Power Cord

The Power Cord performs one basic function: to deliver the AC power from the power source to the projector. It must be configured to meet the Electrical Specifications for the region the projector will be used. The Power Cord type is NEMA 5-20, 20A, 250A.

AC Circuit Breaker

The AC Circuit Breaker has two basic functions: one is to connect and disconnect electrical power from the projector, the second is to protect the projector from over-voltage conditions.

When the AC Circuit Breaker is in the OFF position, no electrical energy will reach any part of the projector except for the AC Circuit Breaker. When the AC Circuit Breaker is in the ON position, electrical energy goes to the AC Line Filter and on to the Low Voltage Power Supply and Arc Lamp Power Supply. When the AC Circuit Breaker is in the ON position but the projector has not received the POWER ON command either from an IR Remote Control or from a PC or Laptop computer, the projector is in Standby mode. In the Standby mode, the +5.1 V Standby and the +24 V Standby Voltages maintain power to the CPU chips on the System Controller PCB, the IR Detectors, and to the cooling fans.

The AC Circuit Breaker is rated at 90-264 Vac (RMS), 50/60 Hz. The current rating is 13 Amps RMS at 90 Vac.

The power requirements of the Model 250 Projector are 200-264 Vac, 50/60 Hz, single phase. The power consumption is rated at 2800-Watts maximum.

AC EMI Filter

The AC EMI (Electro-Magnetic Interference) Filter prevents switching noise from a regulated power supply such as the Low Voltage Power Supply and the Arc Lamp Power Supply, from returning to the AC power source. This switching noise interferes with the operation of radios, televisions, and other electronic appliances

3-2 Model 250 Service Manual