6130 MSD MMI Tuning positive

We use an Agilent 6130 MSD with a G1978B multimode source.

The device is currently operated in negative mode (MM-ES+APCI) and tuned with the negative APCI solution.
When switching to the positive mode (MM-ES) and ESI calibration solution, I could not tune the device because the source was recognized, but the newly set mode (MM-ES) always returned to the old mode (MM-ES+ APCI).
Can you help me, is there another setting I've overlooked?


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