Filament
MAMMOMAT Balance SPB7-115.840.01 Page 30 of 62 Siemens AG
Troubleshooting Guide Rev.02 10.04 Medical Solutions
c) Anode current within normal limits
mA measured during the last exposure will appear on display.
Variations by 1 mA are obtained by changing I
f
of about 0,005 A
Variations by 5 mA are obtained by changing I
f
of about 0,025 A
Variations by 10 mA are obtained by changing I
f
of about 0,050 A
After each filament current change, check the effect on anode current with an exposure.
Repeat the operation till you get the value of expected mA within +0 / -5%
d) Over-current and Over-voltage protection circuit intervention
If Filament current is increased for calibration with respect to previous values Over-current or
Over-voltage alarm could occur.
Over-current
Check if LED1 and LED4 switch OFF after pushing x-ray pushbutton.
In such a circumstance, increase voltage reference at TP1 by means of RV6
Over-voltage
Check if LED1 and LED4 switch OFF after pushing x-ray push button.
In such circumstance increase voltage reference at TP3 by means of RV3
When calibration is finished protection circuits MUST be recalibrated
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