> For the complete documentation index, see [llms.txt](https://commanderhelp.verifone.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://commanderhelp.verifone.com/customer-documentation/petro-and-c-store/pin-pads/implementation-guides/m400/maintenance-and-cleaning.md). # Maintenance and Cleaning This section describes the Maintenance and Cleaning procedures for the Verifone M400. \ The Verifone M400 has no user-maintainable parts. It can, however, be cleaned. ### General Care Your terminal device is a product of superior design and craftsmanship and should be treated with care. The following suggestions will help you protect your warranty coverage. * Keep the device dry. Precipitation, humidity, and all types of liquids or moisture can contain minerals that will corrode electronic circuits. If your device does get wet, switch off the power, and allow the device to dry completely before replacing it. * Do not use or store the device in dusty and dirty areas. Its moving parts and electronic components can be damaged. * Do not store the device in hot areas. High temperatures can shorten the life of electronic devices, damage batteries, and warp or melt certain plastics. * Do not store the device in cold areas. Moisture can form inside the device and damage electronic circuit boards when the device returns to its normal temperature. * Do not drop, knock, or shake the device. Rough handling can break internal circuit boards and fine mechanics. * Do not paint the device. Paint can clog the moving parts and prevent proper operation. * Keep the device free from any small and loose items (such as paper clips, staples, or coins) that could accidentally get inside it through an opening, such as the SD card reader slot or the primary smart card reader slot. * Do not attempt to open the device other than as instructed in this guide. This device has security features that protect it from tampering. For example, the file content will be deleted if the device’s outer casing is opened. These suggestions apply equally to your terminal device, or any of its attachments or accessories. If your device is not working properly, take it to the nearest authorized service facility for servicing or replacement. For your safety, have this device serviced only by a Verifone-authorized service provider. ### Surface Cleaning To clean the device, use a clean cloth slightly dampened with water and a drop or two of mild soap. For stubborn stains, use alcohol or an alcohol-based cleaner. {% hint style="warning" %} Never use thinner, trichloroethylene, or ketone-based solvents – they can deteriorate plastic or rubber parts. Do not spray cleaners or other solutions directly onto the keypad or display. {% endhint %} #### Magnetic Card Reader Dirt accumulation can lead to MSR reading problems unless you clean the Magnetic Stripe Reader (MSR) on a regular basis (daily to once a week, depending on usage). Clean the MSR using commercially available card reader cleaning cards or using recommended Verifone MSR-cleaning card (PN 02746-02). {% hint style="info" %} If using a commercially available cleaning card use ONLY an approved MSR cleaning card made specifically for POS MSR Card reader terminals or Petroleum MSR card readers. {% endhint %} #### Smart Card Reader Do not attempt to clean the Smart Card Reader (SCR). Doing so may void any warranty. For smart card reader service, contact your Verifone distributor or service provider. {% hint style="warning" %} If you find foreign objects in the SCR, send your terminal to a Verifone authorized repair center. Do not use Verifone’s recommended MSR-cleaning card (PN 02746-02) or commercially available card reader cleaning cards with the SCR. {% endhint %} --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://commanderhelp.verifone.com/customer-documentation/petro-and-c-store/pin-pads/implementation-guides/m400/maintenance-and-cleaning.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.