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3. ADJUSTMENTS
Check Item
Wiring check
Rejecting source of
niose and interference
Ground
Ship's mans voltage
Watertightness
Heading alignment
3.2
Adjustment of Transceiver Unit
Selecting audio frequency
Select audio frequency of 1000 Hz or 900 Hz by jumper connector JP2 on PCB
06P0192 in the transceiver unit. The default setting is 1000 Hz. Refer to Figure3-1 for
the location of JP2.
Signal offset adjustment
When noise appears on the screen, adjust R61 (offset) on PCB 06P0192. Turning R61
clockwise slices off low level signals in a similar way to the CLUTTER control on the
display unit. (While the CLUTTER control on the display unit eliminates low level sig-
nals without changing signal level of strong signals, R61 shifts signal level of all sig-
nals.) When the offset adjustment is necessary, set R61 fully counterclockwise. Refer
to Figure 3-1 for the location of R61.
3-2
Table 3-1 General checks (con't)
• All cables are correctly connected.
• All lead wires are tightly fixed with contact pins or crimp-on lugs.
• All screws are firmly fastened.
• Cables are firmly secured.
• Cable shields are property grounded.
• Noise generating machinery (motor, radiotelephone, TV set, etc.) are
not placed nearby.
• Magnetic devices are not placed in the vicinity of display unit.
Each unit is grounded with a copper strap.
Ship's mains voltage is stable 24 or 32 VDC.
Water should not leak from the main body flange or along the main shaft.
A target is displayed on the correct bearing.
Check point, Rating
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