Nokia 6680 RM-36 Service Manual page 206

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3. From the Tools menu, choose Options -> GPIB Card.
4. In the Card Type line, select CEC8Bit, then click Start.
After clicking Start, the name of the CMU200 communication tester appears in the list of found Listeners.
5. To specify the cable loss from module jig to CMU200, choose "Set Loss" from the Tuning menu.
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RF Troubleshooting and Manual Tuning Guide
RM-36
Issue 1