You can stop a CTS service when the instance is currently running. Any items that are currently in the processing queue are removed.
To stop a CTS instance:
Connect to the repository where the CTS instance is located.
Click the Administration > Content Transformation Services node.
Click the CTS Instances node or link.
Select the CTS instance that you want to stop from the list of available instances.
Click Tools > Content Transformation Services > Stop.
OR
Select the CTS instance that you want to stop from the list of available instances and select View > Properties > Info.
On the CTS Instance Details screen, click Stop.
The Status for the CTS instance changes to Stopped.