Panasonic KX-FLB852CX Service Manual page 143

For the receiving problem, we have thought of causes other than in the software. Some causes may be when the fax changes
to the memory receiving mode (for example, when out of paper). and the memory becomes full of the unprinted fax data. In this
case, [MEMORY FULL] and its main cause (for example, "OUT OF PAPER") are displayed on the LCD. Accordingly, by solving
the main problem, [MEMORY FULL] can be canceled and the receiving problem can solved.
Please refer to USER RECOVERABLE ERRORS (P.81) for the above items.
Also, when it actually becomes a hardware deformity, please check each sensor.
6.6.10.1.4. THE UNIT CAN COPY, BUT CANNOT TRANSMIT/RECEIVE
CROSS REFERENCE:
TEST FUNCTIONS (P.88)
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KX-FLB852CX / KX-FLB852CXS