Only The Surface Echo Is Displayed; The Sensitivity Is Poor - Suzuki S-1800M10 Technical Manual

Only the surface echo is displayed.
The sensitivity is poor.
The picture does not change even if the Gain or Far Gain Control dial is turned.
Is TX POWER D set?
Is TVG CURVE setting changed
from the user setting?
Does Picture Display on the
screen change by turning
Gain/Far Gain Control dial?
TR PCB J1-No.2: 12V & J1-No.5: 70V
(or 85Volt in case Power Supply
Are the output waveforms are normal?
Are the output waveforms
normal when replacing
Transducer with Dummy?
*
Soundome
* DUMMY RESISTANCE
120Ω／0.0057μＦ
（180kHz）
Use the over 10W and 1.5kV pressure-resistant dummy resistance.
Use the dummy resistance just for the confirmation of the output waveform.
Do not flow the current for a long time. Otherwise it will cause fire.
NO
YES
NO
YES
NO
YES
NO NO
PCB-85V)
YES
YES
NO
NO
YES
160Ω／375μH
（80kHz）
Set TX POWER D in
FUNCTION SET, MENU2.
Reset TVG curve setting in
FUNCTION SET, MENU2.
* To be continued to the next page.
* OUTPUT WAVEFORM
180kHz：500Vp-p
(or 600Vp-p in case Power Supply PCB-85V)
80kHz：535Vp-p
(or 650Vp-p in case Power Supply PCB-85V)
-15-
Hull Unit portion
Power Supply PCB
TR PCB
（Transducer−GND）