Furuno 1824C-BB, Installation Manual

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3-13
3.2 Checking Magnetron Heater Voltage
Magnetron heater voltage is formed on the MD (1824C-BB), PTU (1834C-BB) or RTB
(1934C/1944C1954C-BB) 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-BB),
PTU (1834C-BB) or RTB (1934C-BB/1944C-BB/1954C-BB) Board in the antenna unit.
Refer to the table in below.
4. Confirm that the multimeter indication is within the ratings shown below.
MODEL1824C-BB MODEL1834C-BB MODEL1934C-BB/
1944C-BB/1954C-BB
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