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5.8.3.1 Control Board

Slide the control board out about an inch and disconnect all the electrical connectors along its outside edge,

then remove the board.

Dipswitch conguration on replacement control boards:

• Switch 1 must be ON.

• Switch 2 must be OFF (if board is used in an incubator).

• Switch 3 must be ON if servo humidier is installed.

• Switches 4,5, 6 and 7 are unused and should be OFF.

• Switch 8 must be OFF. (If switch 8 is on, unit will power up in service mode.)

NOTE: Always perform System Calibration and Humidier calibration after replacing the control board.

5.8.3.2 Relay Board

Remove the two M3 hex nuts that secure the relay board retainer bracket with a 5.5 mm socket, then pull the

board out a little and disconnect the electrical connectors on the outer edge. Then pull it out a little more and

disconnect the connectors at the bottom end of the board. Now the board can be pulled out the rest of the way

so the back connectors can be disconnected. You can now access the 4 fuses on the board.

NOTE: Always perform Line Voltage Calibration after replacing the relay board.

5.8.3.3 Solid State Relay

To replace the solid state relay, disconnect the electrical connections, and using a 7mm wrench remove the 2

nuts that secure it to the enclosure.

5.8.3.4 Power Supply

To access the power supply, disconnect the 50 pin ribbon cable that crosses in front of it. To remove the power

supply, use a 5.5 mm nut driver to remove the nuts that secure it.

NOTE: The fuses on the power supply cannot be replaced. If the fuses are open, there will be component

damage that necessitates replacing the entire power supply.

After installing the replacement power supply, perform the following tests:

To verify the power supply outputs are correct, measure the following voltages on one of the unused

connectors that feed power to the option boards. The voltages are not adjustable. If they are out of

specication the power supply must be replaced.

Signal Measure at Acceptable Range

5 Volts Pins 2 to 1 4.75 volts to 5.25 volts

12 volts Pins 3 to 1 10.80 volts to 13.20 volt

Chapter 5: Repair Procedures

GE Giraffe Service Manual

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