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.