GE Healthcare
Senographe DS
Revision 1
Service Information and Procedures Class A 2385072-16-8EN
Job Card CAL A003 - X-Ray Tube Focal Bias Voltage Scale Factor
Page no. 1657
Chapter 9
JC-CAL-A-003.fm
6-2
Check focal bias command values
1. Switch on the Senographe.
ERROR 007/024 is normal with 400 PL1 XJ7 disconnected.
2. Select
SETUP/GENE/INSTAL/GENE/GENE/BIAS/VOLTAGE
on the X-ray Console.
3. Rotate the kV dial in order to check that all four focal bias voltage command values are the same as
the values specified on the label on the X–ray tube housing:
MO/LF =
(typical value is +70v)
RH/LF =
(typical value is +70v)
MO/SF =
(typical value is +250v)
RH/SF =
(typical value is +250v)
Modify any values that appear different from these on the tube label by using the CHANGE key,
rotating the kV dial and using the NEXT, VALID and SETUP keys. See
and
Modification and Entry of Values
Note:
The bias voltages are repeated on a label inside the generator, above the CPU board.
6-3
Calibration procedure
1. Open the work list and declare a new Patient called "X-ray Tube BIAS cal".
2. Select
SETUP/CALIB/100TH-M1/PARAM
on the X-ray Console.
3. Select and change I and J with values written on the Generator Command Board 400-PL1, I is
between -1 and -0.5, J is between 240 and 400.
! Notice:
Even if the I and J values are the same, you must re-enter them otherwise you will not be able to
perform the calibration.
4. First calibration point:
a. Select
SETUP/SETUP/CALIB/1st pt/CALIB
on the X-ray Console; press the Exposure button
on the X-ray Console (no X-rays are produced) and hold it until the voltmeter reading stabi-
lizes.
b. Note the focal bias voltage value measured from the voltmeter; release the Exposure button
.
c. Select
SETUP/MEASV
on the X-ray Console.
d. Enter and confirm the measured focal bias voltage value.
5. Second calibration point:
a. Select
SETUP/SETUP/2nd pt/CALIB
on the X-ray Console; press the Exposure button
on
the X-ray Console (no X-rays are produced) and hold it until the voltmeter reading stabilizes.
b. Note the focal bias voltage value measured from the voltmeter; release the Exposure button
.
c. Select
SETUP/MEASV
on the X-ray Console.
d. Enter and confirm the measured focal bias voltage value.
6. Third calibration point:
