Having come across an Anytone AT-5555 that was off frequency from the factory, I have discovered how to adjust the oscillator from the front panel, so it's now back on frequency!
Press and hold "FUNC" while powering on the radio
then press "RB" once
then press "AN/ANL" once
then press "DW" once
the radio enters adjustment mode when the LCD displays BFXXX, (where XXX is the numeric setting value) and you must make adjustments to the frequency in each mode, one by one.
I would not recommend performing this procedure without suitable equipment to count the frequency and make a note of the values before changing them
Note: I did not need to modify resistor R567 for this adjustment and it seams to work well without it.
Special thank you to Highfields ARC, Qixiang and N6QLC providing the community with this information.
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