Suzuki S-1800H80/180, Technical Manual

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[Transducer Disconnection]
Remove J2 in the TR PCB and set the tester to the 100M ohm or more range between the connector
No.1 and No.3.
Connect the red or black lead of the tester alternately.
If it is normal, the indicator will move a little.
If the indicator will not move, the disconnection is suspected.
If there is a resistance value, seawater may invade the Soundome.
-14-
No Picture Display on the screen when scanning.
Is there a transmission line in red in
the center of the screen?
Consult Low Sensitivity.
Nothing has changed when Gain
Control/TVG is turned into
level 10.
Soundome
Is the transducer normal?
Hull Unit portion
Main PCB
TR PCB
Check Pin on the TR PCB
J1-No.2: 12Volt
J1-No.5: 70Volt
(or 85Volt in case Power
Supply PCB-85Volt)
Is the output voltage normal when
J1 in TR PCB is removed?
Are the trigger waveforms seen
at J3-No.1 in the TR PCB
normal?
Hull Unit portion
Main PCB TR PCB Power Supply PCB
Does the whole screen turn into
red when J3 is removed from
TR PCB?