JVC 250 ユーザーズマニュアル
Chapter 3---Electrical
Model 250 Service Manual
3-3
3.3 Power
Supplies
All Series 200 projectors including the Model 250 have three power supplies.
These include:
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.
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.
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.
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.
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.
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).
non-standby supply (all the outputs are working or not working).