Examine customer's image reference plot. Agree on a test plot that fits with what LPI and quality of jobs the customer is doing (FM/AM Proofing, linework, or high quality).

Wait for the graph to appear.

Examine the strokecal.spt graph in ServiceShell. This will give a baseline as to the health of the head. Compare to the factory or previous graphs and keep for reference.

Refer to the sample graphs at the end of the Thermal 1.x Exposure Head Preventative Maintenance .

1. Type:
   >>mode media
   x(x=media in use)
   >>laser on
>>laser
2. Record the current value that the head draws at the specified wpower. Record laser on time in hours.
   Type:
   >>set head nomlsrcur
3. The current should be less than nomlsrcur. Type:
   >>head power sum (use >>head power full if firmware version is earlier than 1.62v)
   >>laser off
   

Check the laser output of the head at the wpower for the media that is used. Note and record the current draw when the laser is on.

If the laser current approaching the >>set head nomlsrcur value, it is a good indication the head is nearing end of life.

Check the power at the nosepiece and compare to the power on the Media spreadsheet for the given media.

Check that the sum value is around 1000 units and the error is near 0 (see note, below). A sum lower than 1000 can indicate debris buildup on the final lens. If the lens is clean and the error is not 0 ± 25 units, reinstall the head as per the head install document.
Note: The error may be different on a Spectrum device.

Device must be powered down. All laser safety procedures must be followed.

TH1.0: Thermal 1.0 Head Installation Procedure

TH1.7: Thermal 1.7 Head Installation Procedure

The pressure tap in the vacuum nozzle needs to be clean of debris in order for the debris removal system to work properly.

TH1/1.7 Lens Cleaning Procedure (77-0125A)

Note: make sure you order the lens cleaning kit (Lens cleaning kit: 04-0012B BOM).

Follow the head installation procedure.

• Check that the sum value is around 1000 units and the error is near 0
• If the lens is clean and the sum is lower than 1000, you may need to adjust the surface reflectivity

TH1.0: Thermal 1.0 Head Installation Procedure

TH1.7: Thermal 1.7 Head Installation Procedure

Generate a new stroke graph and compare it to the stroke reference graph (Step 3) to determine any changes as a result of the nozzle or lens cleaning.

Compare the strokecal graph obtained in the previous step to the sample graphs (at the end of the Thermal Head 1.x Planned Maintenance) and determine if any parameter adjustments are necessary.

In Splot or Service Shell run: getcontr.spt

If adjustments are required, type:
>>set head Bposn xxx

Compare the graph obtained to the sample graphs at the end of the Thermal Head 1.x Planned Maintenance. Determine if any adjustments are necessary.

Note: This may cause a change in the strokecal graph. If changes were made to the Bposn value, repeat Steps 27 to 28.

1. Type:
   >>mode media
   x(x=media in use)
   >>laser on
>>laser
2. Record the current value that the head draws at the specified wpower. Record laser on time in hours.
   Type:
   >>set head nomlsrcur
3. The current should be less than nomlsrcur. Type:
   >>head power sum (use >>head power full if firmware version is earlier than 1.62v)
   >>laser off
   

Verify the laser output of the head at the wpower for the media that is used. Note and record the current draw when the laser is on.

If the laser current approaching the >>set head nomlsrcur value, it is a good indication the head is nearing end of life.

Check the power at the nosepiece and compare to the power on the Media spreadsheet for the given media.

A list of FCOs can be seen at the FCOs page of the Thermal 1/1.7x TechPlanet site. Also check that all firmware upgrades have been carried out.

Test the operation of the lens shutter. Type:
>>shutter open
>>shutter close

Another test option is to type >>focus cal reflect and listen to the shutter rapidly opening and closing.

If possible, listen to the sound and check that operation is normal. Clean the shutter, if necessary.

Generate a final strokecal graph and a THXXXX.cfg file that can be used for future reference. This script takes approximately 6 minutes to run. Leave the THXXXX.cfg file on the workstation for future reference.

Each device will have a head-mounted Dehumidifier Unit (DHU).

1. Power down the device and purge all air from the system.
2. Replace the filter (PN 55-1219).
3. Turn the air on and power up the device.

CAUTION: If the differential pressure indicator displays red you need to examine the bowl to determine if the device has been tripped by moisture or oil in the line. You must replace the DHU (part number 05-0244) once it has been tripped, then investigate why the DHU tripped. Rectify air quality before reinstalling the new DHU.

Note: If the device has a desiccant box: upgrade the Desiccant pack to a DHU (kit #05-0244). For details, see the Dehumidifier Unit FCO E246 information.

Allow 30 minutes, 5 minutes to return device to customer.