Kyocera TASKalfa MZ4000i/MZ3200i FAX platform — E01721
Kyocera E01721 means the selected fax transmit speed is not supported by the recipient. The guidance here is specific to TASKalfa MZ4000i/MZ3200i FAX platform and the Fax/speed compatibility operation.
Error meaning
The selected fax transmit speed is not supported by the recipient.
This interpretation is tied to the reviewed family/platform and subsystem. Do not reuse the code by itself on another printer family.
Applies to
TASKalfa MZ4000i/MZ3200i FAX platform
- TASKalfa MZ4000i
- TASKalfa MZ3200i
Common formatting
These are lookup/formatting aliases for this reviewed condition, not separate pages.
- E01721
What usually causes it
- The selected high-speed transmit mode is not supported by the receiving fax. The local machine can place the call, but the negotiated sending speed exceeds what the far-end equipment accepts.
- The exact condition recorded for this code is: The selected fax transmit speed is not supported by the recipient.
- Lower the transmit speed for this destination or remove a forced high-speed setting, then resend a small fax. Keep the same number and document so the speed change is the only variable.
What to try
Check the condition this code actually names
Choose a transmit speed the receiving fax supports and retry.
Isolate the affected part of the workflow
Lower the transmit speed for this destination or remove a forced high-speed setting, then resend a small fax. Keep the same number and document so the speed change is the only variable.
Run a controlled confirmation test
If a lower speed succeeds, save a destination-specific speed only when needed rather than reducing every fax job. Older fax hardware, gateways, and some VoIP paths can have different negotiation limits.
After each corrective action
Retry the original operation that produced E01721. If it works, stop there rather than moving into unrelated troubleshooting.
If the code returns
If E01721 occurs with several unrelated recipients, record the configured transmit-speed setting and line type because the issue may no longer be unique to one remote machine.
When service may be needed
There is no benefit to opening the printer for a negotiated transmit-speed mismatch. Escalate line or gateway compatibility only after a supported lower speed has been tested.
Continue with guided troubleshooting
If the printer still is not working after the reviewed checks, carry this verified error context into the guided troubleshooter.
Related information
Verified source
Official two-model FAX guide. Error Code List establishes fax/i-FAX meanings and family scope; public guidance is independently paraphrased.