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3–3
Procedure
1) Turn on the power. Press [RADAR MENU] [0] [0] [2] [3] to select TIMING ADJ on the
INITIAL SETTING 1 menu.
2) Transmit on the 0.25nm range.
3) Adjust radar picture controls to display picture properly.
4) Select a target echo which should be displayed straightly.
5) Adjust the VRM control to straighten the target echo.
6) Press the [ENTER] key.
3.4 Adjusting Video Signal Level
When the signal cable is very long, the video amplifier input level decreases, shrinking target
echoes. To prevent this, confirm (and adjust if necessary) video amplifier input level.
Procedure
1) Connect an oscilloscope to TP3 on the INT Board (INT-9170).
2) Transmit on the 12nm range. Take trigger at TP10 on the same board.
3) Adjust VR1 on the INT Board so the value of TP3 is 4Vpp. (For secondary display, adjust
VR2 for same level.)
Figure 3-4 Location of INT Board
VR2
TP3
INT Board
VR1