Siemens MOBILETT Plus Service Instructions Manual page 35

Troubleshooting instructions
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MOBILETT Plus and Plus M only
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NOTE
Siemens-Elema AB
Solna, Sweden
Look for a small red light to the right at the kV display. The light indicates that the
program is in the start-up phase.
If there is neither a small red light nor text on the display, it indicates that the
voltage supply is missing. Check the mains connection and the main fuses, see
wiring diagram, page 20, K6.
Test the voltage supply to the CPU board and the display board, see wiring
diagram X037E, page 110, and 120.
Check that all connectors on D8, D1 and D3 are connected.
Check that the Reset LED on D1 is not lit; refer to the circuit diagram on page 110,
V33. If it lights continuously, there is an error on board D1.
Check the voltage supply on D1 and D3. Refer to wiring diagram, page 110 and
120.
Check button functions. Refer to the wiring diagram, page 120 and 180.
Press the collimator lamp button and listen for a "click" from LR1, refer to the
wiring diagram, page 180.
If no "click" is heard, check the voltage supply on D4.
Check the measuring point "LAMPON". If there is no signal, check k5, k9, k3 and
k2.
If a "click " is heard, check the voltage supply in the lamp bracket, refer to the
wiring diagram, page 180.
Press the turn plate button and check if a "click" is heard from MR1 and MR2,
refer to the wiring diagram , page 170. If a "click" is heard, check the voltage in
K68:1-2 and compare it with the references given in the wiring diagram. Check
the resistance in the turn-plate magnet as well, refer to the wiring diagram, page
170.
If no "click" is heard, check the voltage supply on D4 and measuring points
"PIVOTON" and "PIVOTHOLD". If there are no signals check k1, k5 and the
buttons.
After exposures with high mAs values, there is a delay for the ready light indicator
until it lights again. The delay is to distribute the temperature in the anode target
sufficiently and to allow time for the capacitor bank to charge.
During start-up, it can take up to 90 s before the ready light indicator lights. A mes-
sage will be displayed if the ready light indicator does not light.
If the MOBILETT Plus is equipped with a remote
exposure switch system, please see Installation
Instruction: Installation of remote exposure switch
system.
SPR8-215.898.01
Rev. 05 01.02
4
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