The Coax cable is not broken somewhere

Wires have not been pulled out of the control cable

Check the PA fuses in the radio. If there is no output power then there is no VSWR and a 'tune fail' will result

Click Here to see a picture of the 8525B/8528 PA stage

Make sure the whip is not broken

If all else fails you will have to pull the antenna apart. This method describes the common problem of the flexible
coupling between the stepper motor and the worm drive coming off. This can be caused by vibration and the occasional
collision with animals.

NOTE: CODAN recommend you return the antenna to them for service. If you have any doubt in your mind about repairing the
antenna yourself, send it back and pay them to repair it. They are expensive to replace.

Method

1. Remove whip & spring from antenna

2. Undo connectors and earth braid from antenna

3. Remove antenna from vehicle

4. Undo the four screws in the bottom of the antenna. In some cases they are 4mm security Hex bits

5. Undo the two screws holding the plate around the connectors to the base

6. Seperate the base from the antenna and undo the earth braid inside

7. Disconnect the plug on the PCB going to the control lead connector, noting the polarity

8. Partially slide out the mechanism

9. Disconnect the connector for the Coax from the PCB

10. Slide the mechanism out of the housing

11. Disconnect the wire from the PCB going to the tuning coil by undoing the screw.

12. Undo the four 5.5mm nuts from the top of the stepper motor assembly

13. Seperate the tuning section from the motor.

14. Pull the worm drive out.

15. From this point, there are two methods used to attach the worm drive to the stepper motor.
One is a piece of rubber tubing, the other, like the one pictured here, is a plastic coupling.
The rubber tube can be simply reattached, and the plastic coupling can be replaced with a suitable
piece of non-conductive tubing.

16. Re-assemble the antenna. Take care to align the 4 holes in the motor casing with the 4 plastic spigots in the case.
Also, centre the pin at the top of the tuning assembly with the hole in the top of the case.