3-15
3.2 Checking Magnetron Heater Voltage
Magnetron heater voltage is formed on the MD (1824C), PTU (1834C) or RTB
(1934C/1944C1954C/1964C) Board of the antenna unit, and preadjusted at the factory.
Therefore, no adjustment is required. However, check magnetron heater voltage for
confirmation as shown below. This procedure should only be performed by a qualified
technician.
1. Open the antenna unit.
2. Turn on the power. Do not transmit the radar.
3. Connect a multimeter, set to 10VDC range, appropriate position on the MD (1824C),
PTU (1834C) or RTB (1934C/1944C1954C/1964C) Board in the antenna unit. Refer to
the table in below.
4. Confirm that the multimeter indication is within the ratings shown below.
MODEL1824C MODEL1834C
MODEL1934C/1944C/
1954C/1964C
Check point
TP804#6 (+) and #4
(-) on MD Board
TP802#4 (+) and #6 (-)
on PTU Board
J825#4 and #6 (GND) on
RTB Board
Multimeter
indication
7.9 to 8.1 V 7.4 to 7.6 V 7.4 to 7.6 V
Adjustment point VR801 on MD Board R106 on PTU Board VR801 on MD Board
