Furuno IB-681 manual RF Conv Board CPU2 Board, R135, J10

6.Version -1 of the CPU 2 Board, solder a harness of cable assy. (supplied) to the loca- tion shown in the illustration below. Connect other side of cable assy. to J10 on the RF CONV board.

U65

U67

JP2

BT1

CPU2 BOARD 16P0133

U5

DIP SW S1

	GND
HSD ON	U37	U8
	7
U55	U56

12

Part side

C75

CPU2 Board PH5P	RF CONV Board
	J10

U567

U5512

4

1

1

2

Cable assy.

Figure 18 CPU 2 Board Version 1

7.For version -2 and after of the CPU2 Board, connect the cable assy. (supplied) between J7 on the CPU2 Board and J10 on the RF CONV Board.

POWER

DIMMER

LOCK

J7

		INMARSAT-
		MOBILE		B
				EARTH	STATION
		COMPASS
		BEARING
AOR-		ELEVATION
		S	LEVEL
AOR-WEST
POR	EAST	TEL
I				1
OR		TEL
				2
READY		TEL		3
TX		TEL		4
FAIL		TEL		5
		TEL
				6
		TELEX
		DATA

CPU2 Board
Cable assy.
RF CONV Board	CPU2 Board
J10 (PH2P)	J7 (PH5P)
1 GND	1 P20 (HSD ON)
2 HSD ON	2 P21
R135	3 P23
	4 GND
J10
	5
Marked
point

RF CONV Board

Figure 19 Communication unit, cover removed, right side view

8. Replace the rear panel for the communication unit manufactured before 7/98.

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