Muratec MFX-2550 Field Engineering Manual page 160

3.14.8 Pseudo ring test
1. Press <Setting>, <*>, <1>, <1>, then select [Pseudo ring test].
2. Press [Start], to ring the bell.
3. Press [End] to stop.
4. Press [Close] to complete the pseudo ring test.
3.14.9 Serial number writing
This test mode is not applicable to field service of this machine.
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