SECTION THREE — Installing the 491
Connecting the 491 to a transducer
Transducers purchased from Northstar (see page 4) are shipped with a connector installed. The following information is supplied for transducers purchased elsewhere and for cases where it is necessary to remove and reinstall the connector.
CAUTION! | High voltage is present on the transducer wires! |
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Figure 10 and Figure 11 below show how to install the connector on the cable.
1.Slide the heat shrink tubing onto the transducer cable.
2.Slide the connector backshell onto the transducer cable.
3.Prepare each wire for insertion into its solder cup by stripping it as shown below and tinning it.
4.Carefully solder each wire to the appropriate cup as specified in the table.
5.Slide the backshell down the wire and screw it onto the connector body. It should be hand-tight.
6.Using the supplied screws, screw the strain relief onto the backshell.
7.Slide the heat shrink tubing onto the connector. Be sure to leave room for the locking collar to retract.
8.Heat the shrink tubing until it shrinks around the connector provid- ing a watertight seal.
Table 6: 491-to-transducer connector pin wiring
Signal name | Pin no. | Wire color | Wire color |
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| (Airmar B260 | (Airmar B44/B744V |
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| ONLY) | and P66 ONLY) |
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Speed signal | 1 | N/A | Green |
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Speed +V | 2 | N/A | Red |
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Speed ground | 3 | N/A | Bare |
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Thermistor (temperature) | 4 | Brown | Brown |
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Depth 50 kHz + (unused on sin- | 5 | Yellow | N/A |
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Depth 50 kHz – (unused on sin- | 6 | Blk/Wht | N/A |
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Thermistor (temperature) | 7 | White | White |
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Depth 200 kHz + | 8 | Blue | Blue |
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Depth shields | 9 | Shields | Shields |
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Depth 200 kHz – | 10 | Black | Black |
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PAGE 18 | 491 INSTALLATION MANUAL Revision A |
