PN-465U TROUBLESHOOTING
5 – 3
7. HARDWARE CHECK NG
6
8
1
2
4
3
5
7
Major sympton when NG LED flashing pattern Countermeasures
1 LCD 12V The backlight does not light up. The red LED blinks. Refer to 7-1.
2 VIDEO 5V Abnormal colors on the display.
3 AMP 3.3V Sound is not reproduced.
4 AMP 9V
5 BACKLIGHT The backlight does not light up.
6 THERMAL1 Automatic power OFF. red 3 green 3 red 3 green 3 ... Refer to 7-2.
7 THERMAL2
8 THERMAL3
7-1. The red LED blinks
Abnormality
No abnormality
Replace the abnormal part.
Replace the abnormal part.
No NG
Abnormality
Abnormality
NG
Is there any abnormality in the NG position?
Check the power for abnormality
.
Check the fuse for breakage.
Check the cable connection.
Check the switch and the related parts for any abnormality.
Check the connection cable.
Check the
switch PWB.
Check the I/F PWB 1 for any abnormality.
Check the connection cable.
Check the fuse for breakage.
Check the PWB.
To locate the abnormal position, perform a certain
operation or use a certain RS232C command to display
the diagnosis result.
7-2. The LED lights up in order of red 3 green 3 red 3 green.
Abnormality
No abnormality
Replace the abnormal part.
Replace the abnormal part.
Replace the abnormal part.
No NG
Abnormality
Abnormality
NG
Is there any abnormality in the NG position?
Is the unit properly installed?
Check the switch and the related parts for any abnormality.
Check the connection cable.
Check the
switch PWB.
Check the I/F PWB 1 for any abnormality.
Check the connection cable.
Check the fuse for breakage.
Check the PWB.
To locate the abnormal position, perform a certain
operation or use a certain RS232C command to display
the diagnosis result.
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