# Diagnostic

- [SAF Diagnostic](https://helpcenter.verifone.com/t650-error-page/diagnostic/saf-diagnostic.md)
- [Last Transaction Information](https://helpcenter.verifone.com/t650-error-page/diagnostic/last-transaction-information.md)
- [Testing Printer Settings](https://helpcenter.verifone.com/t650-error-page/diagnostic/testing-printer-settings.md)
- [Network Information Check](https://helpcenter.verifone.com/t650-error-page/diagnostic/network-information-check.md)
- [Merchant Information](https://helpcenter.verifone.com/t650-error-page/diagnostic/merchant-information.md): You can use this guide to check the Merchant ID and the Terminal ID linked to your terminal.
- [Testing Chip Reader](https://helpcenter.verifone.com/t650-error-page/diagnostic/testing-chip-reader.md)
- [Battery Fault](https://helpcenter.verifone.com/t650-error-page/diagnostic/battery-fault.md): Follow the simple steps below to check whether your device battery is working correctly.


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