Epson PhotoPC 3000Z, Service Manual

Page: 49 / 109

EPSON PhotoPC 3000Z Revision A
Operating Principles Circuit 49
LIGHT EMISSION CIRCUIT
When RDY and TRIG signals are input from the ASIC expansion port, the
stroboscope emits light.
EMISSION CONTROL CIRCUIT
When the RDY signal is input to the emission control circuit, Q5409 switches
on and preparation is made to let current flow to the light emitting element.
Moreover, when a STOP signal is input, the stroboscope stops emitting light.
TRIGGER CIRCUIT
When a TRIG signal is input to the trigger circuit, D5405 switches on, a high-
voltage pulse of several kilo volts is generated inside the trigger circuit, and
this pulse is then applied to the light emitting part.
LIGHT EMITTING ELEMENT
When the high-voltage pulse form the trigger circuit is applied to the light
emitting part, current flows to the light emitting element and light is emitted.
2.2.4 SY 1 Circuit Description
2.2.4.1 Configuration and Functions
For the overall configuration of the SY1 circuit board, refer to the block
diagram below.
Figure 2-15. SY1 Circuit Board Block Diagram
The configuration of the SY1 circuit board centers around a 8-bit
microprocessor (IC301). The 8-bit microprocessor handles the following
functions:1. Operation key input, 2. Mode LCD display, 3. Clock control, 4.
Power ON/OFF, 5. Strobe charge control.
W A R N I N G Beware of electric shocks.
Special attention is needed because high voltage is generated
around C5412 and xenon lamp terminals.