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4.5 Adjusting Video Signal Level
When the signal cable is very long, the video amplifier input level decreases, shrinking
target echoes. To prevent this, adjust the video level, either automatically or manually.
Adjust it after adjusting tuning and sweep timing and do it on long range. Adjust video
signal level for both main display and sub display (if installed).
Automatic adjustment
1. Turn off the A/C AUTO control
2. Transmit on long range.
3. Display the SET UP 1 menu.
4. Press the [4] key twice to select AUTO from the VIDEO LVL field.
5. Press the [ENTER/SELECT] key to automatically adjust the video level. The mes-
sage “Adjusting video level. Please wait.” appears. When the adjustment has been
completed a beep sounds.
6. Connect an oscilloscope to TP6 on the pcb 03P9230 (display unit) and measure
main bang signal level. It should be 4.0 Vpp ±0.2 V. If it is not, within that range redo
steps 4 and 5 above.
Manual adjustment
If the video signal level could not be adjusted automatically, manually adjust it as follows:
1. Do steps 1-3 in automatic tuning.
2. Press the [4] key twice to select MAN from the VIDEO LVL field.
3. Press the [ENTER/SELECT] key.
4. Connect the oscilloscope to TP6 on the pcb 03P9230. Operate the EBL rotary control
while pressing and holding down the HL OFF control so the main bang level is 4.0
Vpp ±0.2 V.
Figure 4-6 pcb 03P9230