Further Information - Sea Tel 6003A Quick Start Manual

Field Service Procedure – Replacement Level Cage Motor Kit, XX04 &

Further Information:

Now the motor has been replaced verify the system initializes properly, has the correct range of motion and targets the

correct elevation values (if the elevation trim was adjusted because of the targeting error this will need resetting).

If the targeting issue still persists there is the possibility that the driver for the level cage motor on the PCU motherboard

has failed. Test the four transistors on the PCU motherboard for damage as per the below image.

Set your multi‐meter to the Diode setting

procedure and verify the results.

Pins 1 (+) and 2 (‐) = LO

Pins 1 (+) and 3 (‐) = 0.66V (+/‐ 0.03)

Pins 1 (‐) and 3 (+) = LO

Pins 1 (‐) and 2 (+) = 0.66V (+/‐ 0.01)

Pins 3 (‐) and 2 (+) = 0.66V (+/‐ 0.01)

Pins 3 (+) and 2 (‐) = LO

Any readings shorted to ground or out of the above tolerances mean the transistor is defective and the PCU needs to be

replaced (if this is the case it's possible the original motor is not defective).

If the system is displaying a pedestal error (error 8) then there is a drive issue with the antenna and attention will need to

be paid to the motor and motor driver for the relevant axis.

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6003A/6004

and test between the pins of the transistors as per the following

1 3

Document No

135290 Rev B

6004