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500
series portable
echocSounders
CORRECTIVE MAINTENANCE
FUSES AND TEST POINTS
There are two fuses in the transceiver unit
, a 10 A fuse on the power supply
and a 4A fuse on the analog transceiver board. A label on the cover for the PCB
modules points to the test points on the DC
power supply. For information
about other test points , refer to the
PCB descriptions.
TROUBLESHOOTING IDNTS
CAUTION
To avoid electric shock
, always switch off the mains voltage to the
transceiver unit before
removing printed
circuit
boards! com
ponen ts.
1. Check control settings.
Incorrect control settings can indicate a trouble that
does not exist. If
there is any question about the
correct function or operation of any of the
menu commands , refer to section "
Operation
2. Check external equipment.
Before proceeding with troubleshooting, check
that
equipment used with
the echo sounder system is operating correctly. Also
check that input/-
output signals are properly
connected and that the interconnecting cables
are not defective. Check the supply voltage.
3. Visual check.
Check the equipment visually. Many troubles can be found by visible
indications
, such as unsoldered connections
, broken wires , damaged
circuit boards or damaged
components.
4. Check power supply.
Incorrect operation of all circuits often indicates troubles in the power
supply. Refer to the power supply description in this manual.
+5V voltage
is indicated by a LED on the top of the
DC power supply, where also test
points for the different voltages are located.
5. Built-
in test functions.
The built-
in test
functions of the
echo sounder are described in paragraph
P3405E/B
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