20
Chapter 5. Troubleshooting
Question
Answer or Solution
Power supply indicator
is off.
Check if the power plug is tightly connected and
check the fuse wire of chassis.
Abnormal video data.
Check if local interference, poor-quality monitor and
optical output power are normal and in the range of
receiving sensitivity.
Irregular horizontal
grain or video images.
Incorrect video input synchronization -- check if the
grounding electrical level is equal, especially the
grounding electrical level of the power of optical
transceiver, and input and output device; check
the connection of video lines and if the input signal
complies with standard.
All indicators are off.
Check if the power adapter works normally, modules
are completed, and the slots are right.
Video indicator of optical
receiver flashes.
Receiver is not receiving the right optical signal;
check if the link loss rate is normal. The rolling
diameter is too short (less than 20cm); impurities
on ceramic interface (gently clean it with alcoholic
cotton).
Video indicator of optical
transmitter is off.
Optical transceiver is not receiving video signal;
need to check the video input.
Snowflakes emerge in
output video of receiver.
Bit error in transmission -- check if the link loss is
too much; the rolling diameter cannot be too short
(not less than 20cm); transmission is unstable
because operating temperature is too high.
Abnormal data.
Check if data protocol is right (if using RS232
transmitting RS485, etc.), the transmitting direction
is right (forward and backward or bidirectional),
connection is right or not (data is positive or
negative, transmitting or receiving), and the data
input is right or not.