CVS-833/833C
Chapter 7
Trouble Shooting
Chapter 7 Trouble Shooting
This chapter covers simplified fault locating procedures to assist the ship’s crew to locate a faulty
module as well as to replace a fuse.
7.1 Information required for service
Please advise the following details:
(1) Name of vessel, Satcom number if available.
(2) Equipment type name
(3) Equipment serial number
(4) Software type name, shown on the standby screen and stated in this manual.
(5) Next port of call, ETA and ship’s agent
(6) Faulty conditions and the result of on board check
7.2 Self check function
When the CVS-833/833C is first turned on, a memory check program runs to diagnose a possible
memory cell failure. If the result is normal, the message “SELF CHECK RAM CHECK” will appear on
the screen indicating that the memory check is complete without any failures detected. If this sign
does not appear, a memory cell may be faulty. Call for service to repair the CVS-833/833C unit.
7.3 Trouble shooting
The following table provides information about first line check schedules to locate a faulty area and
gives remedial measure(s), where applicable.
Table 7.1 Fault finding chart for CVS-833/833C
Faults detected
Possible cause of the failure
Remedial action against negative
result
Equipment does not turn
on
1. Is the 5A fuse blown?
2. Is the power supply voltage lies
within the rated range (10.8 – 31.2
VDC)?
3. Is the power cable firmly
connected to a ship’s battery?
4. Is the cable connection between
the transducer and TX/RX unit
firm and secured?
1. Replace the blown fuse with
new one.
CAUTION: Make sure to turn
off the main supply before
attempting to replace the fuse.
2. Use a proper rated main
supply.
3. Reconnect the cable firmly to
the battery.
4. Check the cable for cut, short,
etc. and repair the cable if
necessary and reconnect.
Equipment turns on with
beep but nothing shown
on the display.
1. LCD unit may be faulty.
2.
Logic PCB may be faulty.
1. Call for service.
2. Call for service.
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