Ricoh D131 Service Manual page 956

Code
0-21 EOL signal (end-of-line) from
the other end not received
within 5 s of the previous EOL
signal
0-22 The signal from the other end
was interrupted for more than
the acceptable modem carrier
drop time (default: 200 ms)
0-23 Too many errors during
reception
0-29 Data block format failure in
ECM reception
D619
Meaning Suggested Cause/Action

Check the connections between the FCU
and line.

Check for line noise or other line problems.

Replace the FCU.

The remote machine may be defective or
may have disconnected.
Cross reference
Maximum interval between EOLs and between
ECM frames - G3 Bit Switch 0A, bit 4

Check the line connection.

Replace the FCU.

Defective remote terminal.

Check for line noise or other line problems.

Try adjusting the acceptable modem
carrier drop time.
Cross reference
Acceptable modem carrier drop time - G3
Switch 0A, bits 0 and 1

Check the line connection.

Replace the FCU.

Defective remote terminal

Check for line noise or other line problems.

Try asking the other end to adjust their TX
level.

Try adjusting the RX cable equalizer
setting and/or RX error criteria.
Cross reference
Rx cable equalizer - G3 Switch 07 (PSTN)
Rx error criteria - Communication Switch 02,
bits 0 and 1

Check for line noise or other line problems.

Check the FCU - NCU connectors.

Replace the NCU or FCU.
64 SM