Tpu Carriage Unit Outline - Epson Perfection 4870 Photo Service Manual

Perfection 4870 Photo

2.1.1.2 TPU Carriage Unit outline

The TPU Carriage Unit consists of TPU Inverter Board, Lamps (light source), SUB_C
Board, and SUB_D Board. (Refer to figure 2-3.)
SUB_D Board
SUB_C Board
Lamps
TPU Inverter Board
Figure 2-3. TPU Carriage Unit Configuration
OPERATING PRINCIPLES
LEDs
Rear
Front
Engine Operation Outline
TPU Inverter Board Boosts +24VDC and converts DC to AC to generate
the voltage for driving the Lamps (white cool cathode
fluorescent lamps).
Lamps White cool cathode fluorescent lamps are used as a
light source. When the amount of light is not stable, the
Panel LED is flashes and enter the standby mode until
it becomes stable.
SUB_C Board/ Each board has LEDs to generate an infrared light.
SUB_D Board
Revision A
21