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Service Manual
Service Instructions
Turn the Unit OFF.
Remove the mAs meter and reinsert the Link on the D800 PCB.
3.12 Adjusting the mAs
Turn the Unit OFF.
Remove the Shorting Link "mAs +/-" on D800 PCB banana sockets.
Connect mAs meter to "mAs +/ mAs-" on D800 PCB.
Turn the unit ON.
Trigger the exposures for default kV & mAs settings.
Observe the mAs meter reading and if it is not within the tolerance (i.e. 10% for mAs
<20 mAs and 5% for mAs > 20mAs) of set value adjust the potentiometer P1 on
D915 card
3.13 Switching the Collimator Light ON
Switch ON Collimator Lamp. The Halogen lamp will light up and field of light will
appear on the target. The lamp will be switched OFF automatically after 30
seconds.
If the collimator lamp is switched ON and OFF several times within a short
period, overload protection will automatically switch the light OFF. Cool-down
periods are recommended.
3.14 Aligning the light field to the radiation field
3.14.1 Operating sequence
Load a 24 Cm x 30 cm or 10" x12 " cassette with film and place it on a table or a
similar base. Using a tape measure, set a vertical SID of 100cm or 40" to the upper
edge of the cassette. Using slide flaps set a format of 18 cm x 24 cm or 8"x 10".
Switch on the Collimator Lamp and align the cassette. Attach radio-opaque
markings to the cassette. Attach a washer as lateral marking. Trigger an exposure
and develop the film .
Using a waterproof felt pen, write the following data on the developed film.
- Set SID, Film size, Radiation field size.
3.14.2 Evaluation:
Measure the deviations between light field edges and radiation field edges on all
four sides (X1, X2, Y1, Y2) as shown.
Determine the total deviations in the X and Y direction (ignore the +/- signs).
Both, length deviation (ΣY) and width deviation (ΣX) must be less than 1.6 cm.
Siemens Ltd. Med Division India
Version 4.0
Page 22 of 48
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