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LO Gerexiil)
Adjustment
Turn the TUNE IND LEVEL control in the preset window slowly from left to right and set it where level 5 is
indicated on the tuning display.
Then move the same control slowly until just before the indicator lights up the indicator for level 6.
4-8
External Alarm Speaker Volume Adjustment
(Perform only when an external speaker is connected.)
Operate the radar and set the alarm zone so as to include echo signals.
(Set the zone using EBL1 and 2 and VRM1 and 2, and press ALARM.
Check that the "ALARM" message
appears on the CRT. If it does not appear, press ALARM again.)
Use VR151 on the adjust board to adjust the volume to an appropriate level (Refer to Fig. 51).
4-9
DC-DC Converter
Adjustment procedure:
1. Operate the radar.
2. Use a multimeter (for DC voltage measurement) to check the output voltages listed in the table below.
Monitor
] Voltages as measured
CN301 of Power Supply Board or CNt of Processor Board
to the unit's ground
If any of the measured values deviate from what is listed above, adjust VR302.
3.
Use a frequency counter to check that the output frequency at IC301 pin5 is 90 kHz +0.5 kHz.
If necessary, adjust it to 90 KHz using VR301.
4.
Excessive input protection check
Carry out the following check when the DC-DC converter is replaced: gradually increase the
primary DC supply voltage to the radar, and when it has exceeded 42V to 44V, check that the
JP342 oscillator waveform stops and that the radar itself stops operating. If, necessary adjust
VR303.
Power
Supply
Board
(PQUP823ZA-A)
CN301
CN302
VR301
(@VR303 a
VR302
3
J
Fig. 55
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