In one excel sheet, note down current gain of all filters of ErbaXL 640 from maintenance menu.

Take out sealed unused lamp from Preventive Maintenance kit of ErbaXL 640.

Keep hands away from glass part of new halogen lamp. Make sure that there is no crack or breakage in the glass part.

Make sure that gas does not have been leaked.

Note down ideal gain value given in note provided with new lamp box in same excel sheet.

Now switch off the instrument first.

Remove reaction tray cover of the instrument.

Remove inner cover of Reaction Tray(RCT) by loosening the attached screws.

2 flange like wires attached with old lamp are attached with the 2 screws seen in that area(see below picture) and by following wires you can see a lamp in box like structure(see below picture).

First by loosening the screws remove the wires and then using smallest L shaped key (present in tool box) loose the screw over the box covering lamp. DO NOT REMOVE SCREW FULLY.

Now remove the lamp and preserve it in box with proper labelling(not to be used).

Take new lamp. A slot is present on lamp which should be facing upward while inserting lamp in the box(see below picture)

Tighten the screw over the box using same L shaped key.

Fix the flange like wires in those screws by tightening screws.

Close both covers properly and check alignment.

Now start the instrument and check for light path. Go to SERVICE CHECK⇒RCT TRAY⇒OFFSET. Check the two cuvette lightening and compare their equal brightness.

Start the AUTOSPAN and note down gain of all filters in the sheet of previous gain.

Run the quality controls for atleast 5 times in that batch and one time for next 3 to 4 batch and run the patients samples only after correct control results.

Make sheet of comparision of ideal gain(mentioned in the note present in new lamp packing) and gain before and after changing lamp. Upload the sheet in LIS in Equipment record.