Service Instructions
Multimobil 5C
Siemens Ltd. Med India Version 5.0
Page 24 of 73
Copyright © SIEMENS LTD. All rights reserved. For internal use only
5.3.2 Checking the Filament frequency
¾ Turn the Unit OFF.
¾ Open X11 connector on D915.
¾ Connect oscilloscope to D915.TP.CAL
¾ Turn the unit ON unit displays
¾ Measure the CAL frequency at the CAL TP on D915.
¾ It should be within 1.25 to 1.5kHz
¾ If not tune P3 to set CAL within the above range.
¾ Switch off the unit
¾ Connect back X10 connector.
5.3.3 Filament current measurement
¾ Turn the Unit OFF.
¾ Connect oscilloscope to D915.TP.IH
¾ Turn the Unit ON.
¾ After approx. 3 seconds the Stand-by filament current starts & should be 1.5V ±
0.2V
¾ Select radiography mode
¾ Select the exposure release switch for 1 sec to enter into preparation.
¾ Observe the change in voltage level from 1.5 V ± 0.2V to Preheat value 2.8V ±
0.3 V.
Note: Preheat value is parameter (kV & mAs) specific. Just observe the change in
level on preheating step.
5.3.4 Checking of kV and mAs values
5.3.4.1 Checking the high voltage kVsoll and kVist
¾ Connect oscilloscope to D915.TP.KVS & D915.TP.KV
¾ Turn the unit ON.
¾ Select radiography mode.
¾ Set parameters of 60kV 10mAs
¾ Trigger an exposure.
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