Troubleshooting Flow Chart; Troubleshooting Flow Charts - Hitachi 50VF820 Service Manual

2-18 TROUBLESHOOTING FLOW CHARTS

2-18.1 TROUBLE SHOOTING FOR DIGITAL MODULE
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)
○
( : LED OFF
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
Signal Board
BACK TO ADJUSTMENTS
D302 D303
(Red) (Green)
<PiO04> <PiO03>
○
○
○
○
○
●
: LIT)
front
Digital Module
Signal Power Board
D304
(Yellow)
<PiO02>
○ ○
○ ○
○ ●
● ●
○ ○
Digital Main Board
88
LC58/LC58E
D305 D306
(Orange) (Red)
<PiO01> <PiO00>
○ ●
● ●
● ●
● ●
○ ○
LED1(D306)
LED2 (D305)
LED3 (D304)
LED4 (D303)
LED5 (D302)