Manual Lowrance X87 (page 83 of 92) (English)

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Section 5:

Sonar Troubleshooting

If your unit is not working, or if you need technical help, please use the

following troubleshooting section before contacting the factory customer

service department. It may save you the trouble of returning your unit

for repair. For contact information, refer to the last page, just inside the

back cover of this manual.

Unit won't turn on:

1. Check the power cable's connection at the unit. Also check the wiring.

2. Make certain the power cable is wired properly. The red wire con-

nects to the positive battery terminal, black to negative or ground.

3. Check the fuse.

4. Measure the battery voltage at the unit's power connector. It should

be at least 11 volts. If it isn't, the wiring to the unit is defective, the

battery terminals or wiring on the terminals are corroded, or the bat-

tery needs charging.

Unit operates only in demo mode:

1. The transducer has not yet been connected or has been disconnected.

To leave demo mode, make sure the transducer is securely connected

before turning the unit on.

Unit freezes, locks up, or operates erratically:

1. Electrical noise from the boat's motor, trolling motor, or an accessory

may be interfering with the sonar unit. Rerouting the power and trans-

ducer cables away from other electrical wiring on the boat may help.

Route the sonar unit's power cable directly to the battery instead of

through a fuse block or ignition switch

2. Inspect the transducer cable for breaks, cuts, or pinched wires.

3. Check both the transducer and power connectors. Make certain both

are securely plugged in to the unit.

Weak bottom echo, digital readings erratic, or no fish signals:

1. Make certain the transducer is pointing straight down. Clean the

face of the transducer. Oil, dirt and fuel can cause a film to form on the

transducer, reducing its effectiveness. If the transducer is mounted in-

side the hull, be sure it is shooting through only one layer of fiberglass

and that it is securely bonded to the hull. Do NOT use RTV silicone

rubber adhesive or Marine-Tex epoxy.

2. Electrical noise from the boat's motor can interfere with the sonar.

This causes the sonar to automatically increase its Discrimination or

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Lowrance X87 Manual

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