Hitachi 55HDX99/DW2-U Service Manual page 52

TROUBLESHOOTING FLOW CHARTS
TROUBLE SHOOTING for DIGITAL MODULE (Device error check)
Digital Main P.W.B has five LED (KNIGHT RIDER) on board.
After Power ON these LED will be turned on in sequence as follows.
It may take a few seconds for the sequence.
LED sequence
Sequence
1 (Start)
2
3
4
5 (End)
is turn off the LED,
After Program is loaded without error, all LED will be turned off.
Any LED should not light.
If some errors occur, LED will show the error pattern.
(1) Check that LED is not lit.
(2) If LED is lit, refer to the following table and check the involved devices.
Location of LEDs
TABLE OF CONTENTS
D205 D204
(Red) (Green)
<PiO04> <PiO03>
is Lighting the LED
D203 D202
(Yellow) (Orange)
<PiO02> <PiO01>
51
DW2U
D201
(Red)
<PiO00>