Ricoh A250 Service Manual page 506

BIT SWITCHES
4.2.5 G3 SWITCHES
G3 Switch 00
No FUNCTION
0
Monitor speaker during
1 communication (tx and rx)
Bit 1 Bit 0
0 0
0 1
1 0
1 1
2 Monitor speaker during
memory transmission
0: Disabled 1: Enabled
3-6 Not used
7 Back to back test
0: Disabled 1: Enabled
FA X
Back-to-Back Connection:
The dc power supplies should be adjusted so that the line current to the NCU is
about 30mA.
G3 Switch 01
No FUNCTION
0-3 Not used
4 DIS frame length
0: 10 bytes 1: 4 bytes
5 Not used
6 CED/ANSam transmission
0: Disabled
1: Enabled
7 Not used
A250
(0, 0): The monitor speaker is disabled all through
the communication.
Setting (0, 1): The monitor speaker is on up to phase B in
Disabled the T.30 protocol.
Up to Phase B (1, 0): Used for testing. The monitor speaker is on
All the time all through the communication. Make sure that
Not used you reset these bits after testing.
1: The monitor speaker is enabled during memory
transmission.
Do not change the settings.
Set this bit to 1 when you wish to do a back to
back test.
115 V model: Be sure to connect jumpers JP5
and JP6 on the NCU before doing the test.
220 V model: Be sure to apply dc voltage
between wires L1 and L2 on the NCU.
10 µF
10 µF
Do not change the settings.
1: The bytes in the DIS frame after the 4th byte
will not be transmitted (set to 1 if there are
communication problems with PC-based faxes
which cannot receive the extended DIS frames).
Do not change the setting.
Do not change this setting, unless the
communication problem is caused by the
CED/ANSam transmission.
Do not change the setting.
COMMENTS
1 0µF
10 µF
A891M603.WMF
COMMENTS
4-44
FA X
SM