34
7200790 Service Manual for the HELION
®
XENION
®
Surgical Lighting System GB
11 Testing the Electrics of the HELION M / L Lamp
Figure 02
11.2
11.2
11.2
11.2
11.2 TTTTTesting the voltages and cables in the
esting the voltages and cables in the
esting the voltages and cables in the
esting the voltages and cables in the
esting the voltages and cables in the
lamp
lamp
lamp
lamp
lamp
Dismantling the lamp cover:
1. Lift the sealing lip
1
, unscrew the sheet-metal
screws
2
and put the sheet-metal clips
5
in a
safe place.
2. Unscrew the two set screws
4
and push back the
plastic cover
6
from the lamp.
3. Remove the lamp cover
3
.
Check the cables on the PCB and control panel:
4. Check the secure positioning of the cables
7
/
8
on the PCB and the control panel.
Checking the voltages at the PCB:
WARNING – Electric Shock:
The following measurements must be made
with the power supply switched on.
Cordon off installation site and proceed
with great care.
5. Switch on the power supply and the lamp.
6. Testing the input voltage on the electronics with a
voltmeter.
7. Using a voltmeter, measure the voltage of:
-
5.1 V DC (desi5.1 V to GNDB) and
-
12 V DC (desi12 V to GNDB) and
measure at the measuring points
9
on the PCB:
• If there is no voltage to measure:
-
test the cables according to Chapter 10:
• If the voltage is correct, change the PCB:
-
remove all cable connectors from the PCB,
-
take off the hexagon nut
A
and remove the PCB,
-
fit the PCB as described above, but in reverse or-
der, and attach the cable connector.
Continued on next page.