The high-energy radiation spectrometer Natalya-2M with the complex of scientific instruments PHOTON onboard the satellite CORONAS-PHOTON was launched into a near-earth circular orbit on 30 January 2009. The device Natalya-2M is intended for the detection of gamma rays and neutrons in solar flares. The energy ranges are 0.2‒1600 MeV for gamma rays and 20‒300 MeV for neutrons. Before switching on the device in the orbit, its condition was analyzed with the use of onboard satellite telemetry data. On 19 February 2009 the instrument Natalya-2M was switched on. First and foremost the operation of all measuring channels was tested. On the next stage the optimization of detector SE parameters and the restoration of stabilization spectrometric channels system after passing the South Atlantic Anomaly (SAA) were performed. We obtained the following results:

• an algorithm for the control cyclogram was selected for restoring the stabilization system after passing the SAA;

• the tuning of the Natalya-2M spectrometric detectors was made with the use of the calibrating radiation source;

• the optimal energy levels for anti-coincidence scintilla­tion detectors were chosen.