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A service can access a component by injecting the component into the service using dependency injection. This allows the service to use the methods and properties of the component.

In order to inject a component into a service, the component must be registered with the Angular's dependency injection system. This is typically done by adding the component to the providers array in the component or module decorator.

Once the component is registered, it can be injected into a service by adding it to the constructor of the service as a parameter. Angular's dependency injection system will automatically provide an instance of the component to the service when it is created.

For example, if we have a component called MyComponent and a service called MyService, we can inject the component into the service like this:

import { Component, Injectable } from '@angular/core';

@Component({
  selector: 'app-my-component',
  template: '<p>My Component</p>'
})
export class MyComponent {
  // ...
}

@Injectable()
export class MyService {
  constructor(private myComponent: MyComponent) { }

  // ...
}

In this example, we've registered MyComponent with Angular's dependency injection system and injected it into the constructor of MyService. Now the service can use the properties and methods of the component as needed.