Furuno 1964C, 1954C, 1944C, 1934C Checking Magnetron Heater Voltage, MODEL1824C MODEL1834C

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	TP802#4 (+) and #6 (-)	J825#4 and #6 (GND) on
	(-) on MD Board	on PTU Board	RTB Board
Multimeter	7.9 to 8.1 V	7.4 to 7.6 V	7.4 to 7.6 V
indication
Adjustment point	VR801 on MD Board	R106 on PTU Board	VR801 on MD Board

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