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3. Operate the transceiver unit in air
4. Adjust the R10 on the SEN board as follows;
1) When depth indication is "0m", turn the R10 on the SEN board to CW slowly so that
the depth indication becomes 1m. Then turn the R10 slowly to CCW by a point where
the depth indication starts to change from 1m to 0m.
2) When depth indication is not 0m, turn the R10 to CCW slowly by a point where the
depth indication starts to change to 0m.
Note: Do not adjust R11 on the SEN board without the oil pressurize instrument.
3.3.3 Adjusting Transmission Frequency on the CONT.B Board
When change the transmission frequency or the CONT.B board (01P5741). The V/F
conversion circuit on the CONT.B board must be adjusted for each transmission frequency.
(When only the CONT.B board is delivered, it is adjusted for the frequency 50kHz.)
Necessary Instrument
1. Oscilloscope
2. Signal generator
3. Frequency counter
Caution
Improper settings of the DIP switch may destroy the data of EVRAM on the SEN board.
Do not set the DIP switches S1 and S2 as follows, while adjusting the PC board.
S1
#1
#2
#3 #4 #5 #6 #7
OFF OFF ON
When the S1 and S2 are set to above, the loading mode for NVRAM starts, and then all
calibration data stored in factory may be canceled. In this case readjustment by using the oil
Pressurize instrument is required.
Adjustment
1. Connect PC board assembly to the transmitter unit, using extension cable.
2. Record the present setting of the DIP switches S1 and S2 on the CONT.B board.
3. Set the DIP switch S1 as shown below;
Transmission
frequency
#1
50 kHz
OFF
40 kHz
OFF
33 kHz
OFF
4. Connect the frequency counter to TP1(VFO) on the CONT.B board
5. Set all bits of the DIP switch S2 to OFF.
6. Turn on the transmitter unit by rotating the test screw of the pressure switch.
7. Adjust R25 on the CONT.B board so that the frequency obtained at the TP1 becomes as
follows,
ON
X
X
#2
#3
ON
ON
ON
ON
ON
ON
Transmission frequency
50 kHz
40 kHz
33 kHz
#8
S2 #1
X
OFF
S1
#4
#5
ON
ON
ON
ON
ON
ON
Frequency at TP1
400 kHz
320 kHz
264 kHz
3-5
#2
#3
OFF
OFF OFF
#6
#7
OFF
ON
ON
OFF
OFF
OFF
#4
OFF
#8
ON
ON
ON
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