Saab G3 Manual do Utilizador descarregar pdf (Página 100)

100

Service Manual

Third edition, June 1997

17. If the resistance measured in step 16 is less than 10 MΩ,

check the cable between the Transmitter and the Local

Display according to the steps in chapter 9.14.8 below.

18. If the Local Display is causing the ground failure, try

cleaning and drying the inside of the display. If this

does not help replace the Local Display.

9.14.7 Ground Failure – Wire Terminals

19. If you have come this far in your search for the ground

failure, check the wire terminals. See chapter 9.14.9.

9.14.8 Checking a Cable for Ground Failure

Note: If the cables have not previously been marked, mark them

before removing them from the wire terminal.

1. Disconnect all wires in both ends of the cable. Make

sure the wires are not in contact with anything.

3. Hold all the wires of the cable together so that they are

in contact with each other and measure the resistance

between cable and ground (for example, use ground bar

inside the transmitter housing). If the resistance is

larger than 10 MΩ, the cable is OK.

4. If the resistance measured in step 3 is less than 10 MΩ,

measure between each single wire and ground to find

which wire that is causing the ground failure. When it

has been located, check if there is any spare wire in the

cable or lay a new cable.

9.14.9 Checking a Wire Terminal for Ground Failure

1. Remove all wires from the terminal. Measure the resis-

tance between each terminal and ground. If the resis-

tance is larger than 10 MΩ, the terminal is OK.

2. If the resistance is less than 10 MΩ, try to dry the termi-

nal as well as spraying it with CRC666-spray or equiva-

lent de-moisturizing spray.

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Saab G3 Manual do Utilizador Página 100