Ricoh D131 Service Manual page 1046

Parameter selection for dial tone
detection
6
0: Normal parameter
1: Specific parameter
7 Not used
G3 Switch 08 - Not used (do not change the settings)
G3 Switch 09 - Not used (do not change the settings)
No
Maximum allowable carrier drop
during image data reception
Bit 1 Bit 0
0 0
0-1
0 1
1 0
1 1
Select cancellation of high-speed RX
if carrier signal lost while receiving
2
0: Off
1: On
3 Not used
D619
G3 Switch 0A (SP No. 1-105-011)
Function
Value (ms)
200
400
800
Not used
0: This uses the fixed table in the ROM
for dial tone detection.
1: This uses the specific parameter
adjusted with SRAM (69ECBEH -
69ECDEH). Select this if the dial tone
cannot be detected when the "Normal
parameter: 0" is selected.
Do not change the settings.
Comments
These bits set the acceptable modem
carrier drop time.
Try a longer setting if error code 0-22 is
frequent.
This switch setting determines if
high-speed receiving ends if the carrier
signal is lost when receiving during
non-ECM mode
Do not change the settings
154 SM