Series 8650A Universal Power Meters - Giga-tronics

Troubleshooting5.2.3 Calibrator1. Unplug the line cord from the instrument.2. Remove the instrument cover.3. Release the ribbon cable connector from the calibrator using the extractor handles on the calibratorribbon cable socket.4. Remove the three flat head screws holding the calibrator assembly to the side of the instrument.5. Lift the calibrator out of the instrument.6. When replacing the calibrator, slide the output connector through the hole in the panel, replacethe three screws, and reinsert the ribbon cable connector. Be certain that the extractor handleslock in place.7. Replace the instrument cover.5.2.4 Digital (Host) PC Board1. Unplug the line cord from the instrument.2. Remove the instrument cover.3. Remove the calibrator.4. Disconnect the ribbon cable going to the rear panel RS-232 connector.5. Disconnect the ribbon cable going to the rear panel IEEE 488 connector.6. Disconnect the power transformer connector from the board by pressing on the two plastic ‘buttons’on the connector and pulling straight up with a slight rocking motion.7. Carefully unplug the flex cable going to the front panel from its socket. First lift up the outer ‘U’shaped shell of the connector on the board then pull straight up on the flex cable to remove it.8. Pull up on the four plastic fasteners on the corners of the board. These are captive and do not comeout completely.9. Remove the board from the instrument.☛NOTE: There is a multi-pin connector on the bottom of this board which connects to theAnalog board. Lift the board straight up with a slight rocking motion to un-mate theconnector.10. To replace the board, insert the BNC connectors through the holes in the rear panel, next line upthe pins on the multi-pin connector, then press down on the board. Next press down on the fourplastic latches. Now make sure the ‘U’ shaped outer shell of the flex cable socket is up and carefullypress the flex cable into the socket. Press down the shell to lock the connector. Re-connect thepower transformer, IEEE 488 ,and RS-232 connectors.11. Reinstall the calibrator.12. Replace the instrument cover.Manual 32089, Rev. A3, August 2001 5-9