If the machine does have a control panel just no 10 key number panel, you could try the methods used for older printer only models. The following is from the service manual for the SP C811DN: Method 1:
1. Turn the machine on while pressing the “Online” key and “Escape” key together for five
seconds or more.
2. "[SP mode (Service)]” shows on the display.
Method 2:
1. Press the “Up/Down arrow” keys together for about 5 seconds or more, and then press
the “OK” key.
2. "[SP mode (Service)]” shows on the display.
Just remember, Ricoh may have changed the key combination needed.
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