Hitachi EH-150 Applications Manual page 33

(7) Transmission error (CRC error, overrun)
YES
Is the cable correctly connected?
Is the cable firmly secured in place?
cable been wired together with
of the transmission cable within
Replace the module with a spare one,
if available.
Notify your local authorized distributor
of it.
ERR LED
Flicker at 1 sec intervals
Run a loop-back check
(refer to section 7.3.)
Has an error occurred
in the loop-back check?
NO
Does it happen frequently?
YES
YES
YES
Is there a noise source
nearby the transmission cable
or unit?
NO
Has the transmission
a dynamic power source?
NO
Are the specifications
the permissible range?
YES
Is something touching
the BNC connector?
NO
6-8
Chapter 6. Errors and error recovery
- Error information of each station : bit14 ON
NO
It may be assumed that this is a
temporary problem caused by noise, etc.
Observe developments for a while.
NO
Reconnect the cable correctly.
NO
Separate the noise source from the cable
and unit.
YES
Secure the cable firmly in place.
YES
Install the dynamic power source in
accordance with the instructions provided
in section 5.1.7, such as ensuring that it
is at least 0.3m distant, etc.
NO
Use the transmission cable within the
range of the specifications (distance, etc.)
YES
Cover the connector with the insulated
tube supplied in accordance with the
instructions provided in section 5.1.5.