(No.YA654<Rev.001>)
VPT
Printed in Japan
SECTION 5
TROUBLESHOOTING
5.1 SELF CHECK FUNCTIONS
5.1.1 OUTLINE
This model has a self check function given below. When an abnormality has been detected, the power is turned off and the POWER LED
flashes to inform of the failure. An abnormality is detected by the signal input state of the control line connected to the microcomputer.
5.1.2 SELF CHECK ITEMS
5.1.3 METHOD OF DISPLAY WHEN A RASTER IS NOT OUTPUT
In the state where a raster is not output by breakdown of the set, an error is displayed by blink of the POWER LED.
<Explanation of operation>
If an error is detected, the power is turned off.
Shortly after the power is turned off, the POWER LED will be blinked.
Power cannot be turned on until the power cord takes out and inserts, after the power is turned off.
Detection item Detection content
Diagnosis
signal (line)
Detection timing
Low bias line
short protection
Confirm the operation of the low bias (3.3V/5V/
12V/24V) protection circuit.
3.3V: Q7004
[SIGNAL PWB]
5V: Q7003
[SIGNAL PWB]
12V: Q7001
[SIGNAL PWB]
24V: IC7019
[SIGNAL PWB]
LB_PRO At 10 seconds after the power is turned on, the
self-check function starts. If NG is detected during
3000ms, the power is turned off automatically.
Type of error POWER LED flash cycle
Low bias line short protection LED turning on and off at 2 seconds intervals.
Victor Company of Japan, Limited
Display Division 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan
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