Hitachi 42HDX62/DW1-U Service Manual page 70

11. TROUBLESHOOTING FLOW CHARTS
11.1 TROUBLE SHOOTING for DIGITAL MODULE (Device error check)
Digital Main P.W.B has five LED (KNIGHT RIDER) on board.
After Power ON by POWER_1(6pin of PPT3), 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, ● is Lighting 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
D302 D303
(Red) (Green)
<PiO04> <PiO03>
○ ○
○ ○
○ ○
○ ●
○ ○
D304 D305
(Yellow) (Orange)
<PiO02> <PiO01>
○ ○
○ ●
● ●
● ●
○ ○
70
DW1U
D306
(Red)
<PiO00>
●
●
●
●
○