Test Points And Adjustment - Siemens MAMMOMAT Balance Troubleshooting Manual

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Test points and adjustment

PCB 94-132
TP1
TP2
TP3
TP4
TP5
TP6
TP7
TP8
TP9
TP10
MAMMOMAT Balance
Troubleshooting Guide
kV vs. VTP1 values are only valid if reference voltage measured on TP8 is
5.00 Vdc (standard calibration). If not, new VTP1 can be calculated wth the
following formula: VTP1(new) = (VTP1(table)/5.00) * VTP8
If necessary kV values can be corrected by means of RV5 (PCB 94-132).
RV5 has influence on the whole kV range, adjust kV at 28 kV as pivot point.
kV values are not affected by the mains voltage within the specified limits
kV values are not affected by the anodic load within the normal operating
range.
Measurement of kV value MUST be done only in MANUAL mode since in
Automatic mode exposure is always preceded by pre-exposure pulse.
X-ray beam is pulsed to avoid grid artifact with grid table, to avoid H.V
interruption use grid-less table or remove grid table or press [RESET
alarm]+[kV+] buttons ( valid for the next exposure only ) or set DIP4 SW1
PCB 01-170 to ON for permanent interruption disable.
kV values are not affected by replacement of inverter block or H.V.
transformer and no kV calibration is necessary if kV value has not been
corrected with RV5. After repair kV check is anyway necessary.
kV check according to conversion table
ground
ground
+5 Vdc
HIGH + 13 Vdc during exposure
reference frequency 50 kHz
kV control from CPU 1/100 VTP1 ( valid in PREP and EXP )
+5.00 Vdc reference (standard calibration)
not used
internal input voltage +15 Vdc
SPB7-115.840.01
Rev.02
High Voltage generator
Page 35 of 62
10.04
Siemens AG
Medical Solutions