Ricoh D023, Service Manual, Page: 1485 / 1522

NCU Parameters
D393 144 SM
Address Function Unit Remarks
communication errors
occur frequently during
V.17 reception.
Voltage setting to detect off-hook
for voltage/DP detection for an
externally connected line.
0: Auto
1: Fixed V
Here is a summary of the fixed voltage settings
(1: Fixed) for an externally connected line.
Bit 7 Bit 6 Bit 5 Bit 4 -
0 0 0 0 Not used
0 0 0 1 2.75 V
0 0 1 0 5.5 V
1 0 0 0 22 V
6805E3
1 1 1 1 41.25 V
Do not change these
settings
0 RT=0 (Low)
Bit 1
1 RT=1 (High)
0 RZ=0 (High)
6805E4
Bit 1 sets the level
of the call signal, Bit
3 sets the call
signal impedance
Bit 3
1
RZ=1
(Composite)
-
0 Auto
Bit 0
1 Fixed
0 Use RDTP
Bit 0 sets the ring
detection method,
Bit 1 sets the ring
detection method
when fixed.
Bit 1
1 Use RDTN
6805E5
Here is a summary of the voltages for the
detection of off-hook for DP detection.
If any setting is changed,
select a setting that is
higher than the default
setting.