4.3 TROUBLESHOOTINGCHART
SYMPTOM
CHECK
No Power Input
Display blank or dim
1. Check BRT level.
2. Press any key for audio chirps.
Picture wavey or intensity
fluctuating
1. Check DC voltage input. Low l2V
or contains ripple from charger.
Display not Positioned on
1. Alignments may be necessary per
CRT correctly
section 4.2.
No Echoes; Weak Echoes
1. Check transducer connection.
2. Check Gain, STC, Range scale settings
3. If echoes OK when not moving but
disappear when underway, check
for bubbles across transducer face.
Is transducer installed backwards?
4. Check receiver tuning
Picture frozen
Erratic or no Speed
readings
Temperature readings
N.G . or inaccurate
1. Check in-line fuse. If blown
replace with 10 amp fuse.
2. Check circuit breakers
or in-line switches.
1. Chart speed set to 0. Press
CHSPD
key and
(up) key.
1. Check paddle wheel rotation is free.
See Maintenance section for details.
1. Check
Speed/‘Remp
input, Pins 6
&7
for resistance (approx.
1OK
ohms).
2. Check in Calibration menu or try
Auto Temp adj.
MAINTENANCE
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