Siemens MOBILETT XP Troubleshooting Manual page 63

Basic functions
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).
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Switch off the system
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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).
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Remove the back cover of the MOBILETT XP (Access to D927)
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Remove the metal plate over board D916 For MOBILETT XP Digital, remove the CXDI
PC (laptop) and also remove the holder plate
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Oscilloscope channel 1 at D916 .FC1 (TP25) and D916.GND (TP1)
Oscilloscope setting: 1V/div, sweep 5 µs/div
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Remove the protective cover of D927 Caution! It is possible to come into contact with
components under voltage!
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Disconnect plug X5 of board D927 (breaking the filament circuit)
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Move switch SW2B on D916 to 2 (service program) and switch the system on
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Select service program 9
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Use exposure switch S27 to press and hold "PREP"
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Set the resonance frequency of the filament inverter via potentiometer P3 on D916 to
75kHz +/- 2 kHz
Siemens AG
Medical Solutions
SPR8-230.840.01.05.02
11.05
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MOBILETT XP