JVC Model 200 service manual Arc Lamp Power Supply Alps, P72

Chapter 2---System Description

+24VDC

+80VDC

/LV_OK: When /LV-ENA is enabled, this diagnostic signal indicates to the System Controller the status of the non-standby supply (all outputs working or not working).

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 on the rear panel 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/Vertical Deflection PCB.

Arc Lamp Power Supply (ALPS)

P71

AC	1
INPUT	3
	5

P72

To P9 on	1
	2
Backplane
	3

4

5

6

Line	LAMP_OUT
	LAMP_RET
Earth
Neutral

GNDLAMP_OK

/LAMP_LIT GND /LAMP_OK

/LAMP_ENA

COVER_ON GND

P74

1To Lamp

2Module, J74

P73

1To Lamp

2Module, J74

Figure 2-4.Arc Lamp Power Supply, Block Diagram

Main Functions:

•Provides ignition power to turn the Xenon Arc Lamp ON.

•Provides steady state power to maintain the lamp ON. Inputs:

The Arc Lamp Power Supply receives AC input power directly from the power source. The input range is from 100-240 VAC, at 50 or 60 Hz.

/LAMP_ENA: From System Controller. Turns on the ALPS.

Model 200 Service Manual 2-9