Troubleshooting
MAMMOMAT Balance SPB7-115.840.01 Page 20 of 62 Siemens AG
Troubleshooting Guide Rev.02 10.04 Medical Solutions
Fault
INVERTER
Action
1) if problem is LV=NOK and LED DL1 is Dark replace F2
2) if problem is LV=NOK and LED DL1 is Bright check flat cable CV0172 end eventually
simulate inverter block by means of Jumpers on CN3 PCB 01-170
3) If technical menu appears with Vdc (in)= 000 then F3 of PCB 94-132 is broken,
inverter block 08883436 and H.V. transformer 08883444 must be replaced.
4) If technical menu appears with Vdc (in) = 270 V F6 or F9 is broken.
For investigation of INVERTER Vdc problems, sensing circuit and alarm can be disabled
by means of DIP2 SW2 PCB 01-170.
Vdc voltage sensing is connected at CN4 PCB 94-132 and CN9 PCB 03-188, connection
cable is CV0164.
Normal voltage across CN9 with cable CV0164 connected is about 19,5Vdc.
Voltage across CN4 PCB 94-132 is about 47 Vdc with CV0164 disconnected
Vdc (in) drop is about 100Vdc during exposure and ripple in the same condition is
typically 50 Vpp.
If Vdc drop and ripple voltage are much higher capacitors C1,C2,C3,C4 must be replaced
Note
For kV problems refer to High Voltage generator section in this manual
3) Technical errors in LOG file
CPU of MAMMOMAT Balance has a memory with the last 1300 events including errors and fault
events. This 1300 events can be uploaded on the PC.
Choose Error log,
insert a comment, press Start and press the two buttons Alarm reset and Optical density plus on the
mammo contemporarily.
CN3
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