Grid Movement Test - Siemens MAMMOMAT Balance Troubleshooting Manual

Table detection and grid test
Table driver
Table driver is onboard of PCB 03-188 motherboard, it contains both cassette sensing + leds for all
tables and stepper motor driver for grid tables.
Table driver is connected by serial port to main CPU.
Table detection
The following tables are detected by the CPU in order to guarantee the appropriate functionality.
Cassette detection functions are the same for all the tables.
Green LED is bright fix when unexposed cassette is in. Unit could not be ready for exposure
depending on Door Open and/or no collimation plate.
Green LED is blinking for all other conditions.
If cassette notch sensing switch is enabled ( Table internal jumper removed ) and cassette has no
notch, green Led is blinking even if cassette is properly inserted.
Grid tables.
If grid table is recognized, x-ray beam is pulsed. Both large and small focus can be selected from the
control panel.
Gridless tables.
If gridless table, any kind, is recognized, x-ray beam is continuous, small focus is selec ted
automatically and deselected when gridless table is removed.

Grid movement test

If grid table is inserted, by means of pushbuttons Bell + Compression [-] grid can be moved without
exposure for functionality check.
Grid must oscillate back and forth.
Grid speed is different during the first 7 runs for strokes First right / left, speed for movement must be
regular
Grid movement has time-out of 20" to protect stepper motor.
When Grid movement is activated by main CPU, DL8 of PCB 03-188 becomes bright fix and .LED2
PCB 01-170 blinks following x-ray interruption at grid direction change.
Grid home position is at left side from patient position.
MAMMOMAT Balance
Troubleshooting Guide
Model
18x24 gridless
18x24 grid
24x30 gridless
24x30 grid
18x24 gridless 1,8 X magnification device
SPB7-115.840.01
Rev.02
Table detection and grid test
Page 12 of 62
10.04
Part number
83.83.189
83.83.171
83.83.239
83.83.221
83.83.353
Medical Solutions
Siemens AG