Furuno FS-1503 manual BK Break-in Connection, Telex Filter Bandpass Filter

3.6 BK (Break-in) Connection

BK (Break-in) connection is necessary when the FS-1503 is installed together with an HF receiver or transceiver. The BK circuit functions to mute the receiver when it and the FS-1503 are operated together. With no BK connection, the receiver may generate unwanted noise or its front end may be damaged by strong signals when the radio is transmitted.

Necessary parts

The BK function requires the CONTROL Kit, which consists of the CONTROL Board, con- nector assy., gasket and washer. Install the board following the illustration on page 3-6. For connections, see the interconnection diagram on page S-1.

Contents of CONTROL Kit OP05-41 (Code no. 005-920-330)

Name	Type	Code No.	Qty
CONTROL PCB	05P0459	005-841-000	1
Gasket (3)	05-029-0122-3	100-087-843	1
Connector Assy.	05S0846	000-125-319	1
Washer	16.2x22.0x0.5	000-801-849	1

3.7 Telex Filter (Bandpass Filter)

The Telex filter is installed on the TX/RX Board. Install it as shown in the figure below.

This filter has been mounted at factory on the FS-1503A.

TX/RX BOARD

05P0666

OUT IN

EE

FL3

Solder Telex filter to FL3. Note direction on underside of filter.

Figure 3-4 TX/RX Board, installation of Telex filter

3-4