Ricoh B291 Service Manual page 831

Rev. 10/2006
6805E3 Voltage setting to detect off-hook for
voltage/DP detection for an
externally connected line.
Here is a summary of the fixed voltage settings (1:
Fixed) for an externally connected line.
Bit 7
0
0
0
1
1
⇒
6805E4 Threshold for ring level
bit 2
⇒
6805E4 On-Hook impedance level
bit 3
⇒
6805E5 Selection of positive and
bits negative sides of the signal
0 and 1 waveform for incoming call
detection
SM
CÓPIA NÃO CONTROLADA
Bit 6 Bit 5 Bit 4
0 0 0
0 0 1
0 1 0
0 0 0
1 1 1
93
CÓPIA NÃO CONTROLADA
0: Auto
1: Fixed V
Not used
2.75 V
5.5 V
22 V
41.25 V
Change bit 2 to 1
This will increase the threshold for ringing level
detection.
Change bit 3 0 to 1
This will decrease the on-hook impedance
level
Bit 0= 0: Automatically judged
Bit 0= 1: Manually select to use either positive
or negative side
Bit 1= 0: Use positive side of waveform
Bit 1= 1: Use negative side of waveform
NCU PARAMETERS
Do not change these
settings
B779