JVC 250 Power Supplies, Low Voltage Power Supply LVPS, LVPS - Main Functions, LVPS - Inputs

Chapter 3---Electrical

3.3 Power Supplies

All Series 200 projectors including the Model 250 have three power supplies. These include:

!Low Voltage Power Supply

!Arc Lamp Power Supply

!High Voltage Power Supply

There is a fourth power supply, the Laser Power Supply, but that power supply is used only for the Igniter Assembly during Arc Lamp lighting.

Low Voltage Power Supply (LVPS)

LVPS - Main Functions:

!Provides all the low voltages needed by the projector.

!Provides standby power (+5.1V) when the projector is OFF but the AC Circuit Breaker is in the ON position.

!Provides power (+24 V) for all cooling fans.

LVPS - Inputs:

The Low Voltage Power Supply receives AC input power directly from the AC Line Filter. The input range is from 220 VAC to 240 VAC, at 50/60 Hz.

/LV_ENA - from the System Controller PCB. This signal enables the LVPS when the System Controller receives a Power On command.

/FAN_ENA - from the System Controller PCB. This signal enables the +24v standby voltage for the projector fans.

/COVER_ON - signal enables the non-standby outputs.

/ = Active low

LVPS - Outputs:

!+ 5.1VDC Main

!+ 5.1VDC Stdby

!+ 6.2VDC

!± 15VDC

!+ 24VDC

!+ 80VDC

/LV_OK - this diagnostic signal tells the System Controller PCB the status of the non-standby supply (all the outputs are working or not working).

Model 250 Service Manual 3-3