Siemens AG SPR8-230.840.01.05.02 MOBILETT XP
11.05 CS SD 24
Basic functions 63
Page 63 of 72
Medical Solutions
Fig. 26: Stand By_I
Setting the highest frequency of the filament inverter (75 kHz)
The settings are made via a 2-channel oscilloscope and potentiometer P3 of D916 (CPU).
• Switch off the system
• Remove the top cover and, in the case of MOBILETT XP Digital, place it on its side on a
table or similar surface (do not disconnect any cable connections).
• Remove the back cover of the MOBILETT XP (Access to D927)
• Remove the metal plate over board D916 For MOBILETT XP Digital, remove the CXDI
PC (laptop) and also remove the holder plate
• Oscilloscope channel 1 at D916 .FC1 (TP25) and D916.GND (TP1)
Oscilloscope setting: 1V/div, sweep 5 µs/div
• Remove the protective cover of D927 Caution! It is possible to come into contact with
components under voltage!
• Disconnect plug X5 of board D927 (breaking the filament circuit)
• Move switch SW2B on D916 to 2 (service program) and switch the system on
• Select service program 9
• Use exposure switch S27 to press and hold "PREP"
• Set the resonance frequency of the filament inverter via potentiometer P3 on D916 to
75kHz +/- 2 kHz
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