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3.3 ADJUSTING TRANSMITTER UNIT
3.3.1 Gain Adjustment
The transmitter unit incorporates the preset potentiometers shown in the table. All
potentiometers except for R17 (gain adjustment) on the TRS. A board are for factory
adjustment. For R17, though it has been properly adjusted, readjust it when clear picture is
not obtained. Note that too high gain setting will cause excessive noise.
Function of adjusters in the transmitter unit
PCB
CONT.B
01P5741
TRS.A
01P5742
SEN
01P5744
3.3.2 Depth Indication Adjustment
A oil pressurize instrument is required to adjust the depth indication.
Without the oil pressurize instrument, compensate the depth error by the "Net Depth"
setting in menu screen and offset adjuster R10 on the SEN board.
Following shows the procedure to adjust the offset value "0 m" on the SEN board(01P5744).
1. Connect the test cable or receiving transducer as shown in figure 5.1 and 5.2.
2. Pull out the PC board assembly by the extension cable.
Figure 3.4 Gain adjustment
Pot.
Used for
R5
Frequency deviation adjustment of FM modulation.
R25
Frequency adjustment of FM modulation.
R17
Gain adjustment of receiver circuit.
R35
Maximum gain adjustment of receiver circuit.
R38
STC (Sensitivity Time Control) curve adjustment.
R10
Offset adjustment of depth measurement circuit.
R11
Gain adjustment of depth measurement circuit.
R12
Calibration of water temperature measurement circuit.
3-4
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