Power Supplies - Hughes JVC 100 Service Manual

Power Supplies

The Model 100 includes three power supply assemblies.
Low Voltage Power Supply
!
Arc Lamp Power Supply
!
High Voltage Power Supply
!
Low Voltage Power Supply (LVPS)
Main Functions:
Provides all of the analog, digital, and voltages needed by the projector.
!
Provides standby power when the projector is OFF.
!
Provides power for all cooling fans.
!
Operation:
The main power is filtered via the input filter to prevent radiation from escaping
back to the power line. From the line filter, AC power is fed into the Low Voltage
Power Supply module where AC is rectified, filtered, and compensated for power
factor correction.
The +5.1V Standby is on whenever AC power is connected to the projector and
the circuit breaker, next to AC power connection, is in the On position. The +24V
standby power for the fans turns on when the /FAN_ENA signal is received from
the System Controller (this turns off in 5-8 minutes if power is not turned on by
the remote control or a PC). All other voltages supplied by the LVPS are activated
when power is turned on at the remote or PC. These include +5.1V for digital
components, +6.2V for CRT filaments, ±15V for analog circuits, and the +80V
supply which is used by the High Voltage Power Supply, Video Amplifier PCB,
and the Horizontal Deflection PCB.
P75
AC
INPUT
2-10
1
Line
3
Earth
5
Neutral
Figure 2-5 LVPS Input/Output Diagram.
Chapter 2---System Description
P76
LV Ret
1-7
/LV_ENA
8
/LV_OK To P8 on
9
+24v Fans Backplane
10
+5.1v STBY
11
+5.1v
12
+6.2v
13
+15V
14
-15v
15
+60V
16
/COVER_ON
17
/FAN_ENA
18
Model 100 Service Manual