Service Instructions
Multimobil 5C
Siemens Ltd. Med India
Version 5.0
Page 23 of 73
Copyright
©
SIEMENS LTD. All rights reserved. For internal use only
5.2.1 Checking the Line voltage display.
Depending on the input Line voltage 7-segment display on Radiography and memory
interface D507 PCB will display line voltage when exposure release switch is pressed
in the radiography mode for first 2 sec. The voltage is displayed and if it is not within 2
% tolerance, then change the pot P1 on the D506 PCB.
After switching on the unit, line voltage is monitored after 7 sec. And thereafter at
every 5 sec it is polled and displayed in preparation mode with alternative to kV and
mAs display. During the preparation and radiography time line voltage is not
monitored.
Before changing the pot P1 on D506 release the exposure switch completely and after
adjusting the pot wait for 10 sec to get exact changed reading on display.
5.2.2 Checking the Intermediate circuit voltage
Depending on the supply voltage, a value between 250 to 350Vdc must be measured
with the Digital Multimeter on Capacitors on the inverter module.
5.3 Checking for Exposure parameters
5.3.1 Checking the Main inverter frequency
¾
Turn the Unit OFF.
¾
Short the ST link on the D915
¾
Switch on the unit
¾
The display will be Pr 1 on the radiography display field
¾
Press the kV increment key to reach Pr 7
¾
Press the DL_SERV key on the D507 PCB
¾
The display will be Adj F
¾
Connect oscilloscope on D915.TP.REG and D915.TP.GND.
¾
Press the exposure release switch.
¾
The display will be F on
¾
Measure the REG frequency at the REG TP on D915.
¾
It should be 9.2
±
0.3 kHz
¾
If not tune P4 to set REG within the above range.
¾
Press DL_SERV again
¾
Switch off the unit
¾
Remove ST link from the D915.