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7. Electronic parts and servicing procedures
7.5
Lamp power supply (LPS)
Overview
•
•
•
•
Replacing the Light feedback board
7.5.1
Description of the LPS
Description
To ignite the lamp, the voltage on the output pins of the
lamp power supply
is increased to 140V. This voltage will trigger the Start
Pulse Generator (SPG), which will trigger a high-tension peak to ignite the lamp. When the lamp is on, the voltage on the output
pins of the LPS comes to its normal level of 25V.
The LFR sensor measures the lamp
fl
icker and provides a signal for the
light feedback
board, which is part of the LPS assembly.
This signal is used to reduce the lamp
fl
icker.
In case of failure the LPS assembly is replaced as a unit.
Image 7-48
LPS: lamp power supply
60
R59770141 GALAXY NH-12 20/02/2008
Summary of Contents for Galaxy NH-12
Page 1: ...Galaxy NH 12 Service manual R9040400 R59770141 00 20 02 2008...
Page 4: ......
Page 12: ...1 Safety guidelines 8 R59770141 GALAXY NH 12 20 02 2008...
Page 42: ...6 Projector layout 38 R59770141 GALAXY NH 12 20 02 2008...
Page 142: ...8 Optical parts and servicing procedures 138 R59770141 GALAXY NH 12 20 02 2008...