Sharp FO-4450, Service Manual

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FO-4450U/FO-CS1
2 – 28
SW6 No. 4 MR
MR (Modified READ) selects presence of the compression function.
SW6 No. 5 ~ No. 8 Modem speed
Used to determine the initial modem speed. The default is
14400BPS(V.17). It may be necessary to program it to a slower speed
when frequent line fallback is encountered, in order to save the time
required for the fallback procedure.
SW7 No. 1, No. 2 Reception speed fixed
The transferable speed of modem in the receiving mode is set.
SW7 No. 3 DIS receive acknowledge during G3 transmission
Used to make a choice of whether reception of NSF (DIS) is acknowl-
edged after receiving two NSFs (DISs) or receiving one NSF (two DISs).
It may be useful for overseas communication to avoid an echo sup-
pression problem, if set to 1.
SW7 No. 4 Non-modulated carrier in V.29 transmission mode
Though transmission of a non-modulated carrier is not required for trans-
mission by the V29 modem according to the CCITT Recommendation, it
may be permitted to send a non-modulated carrier before the image
signal to avoid an echo suppression problem. It may be useful for over-
seas communication to avoid an echo suppression problem, if set to 1.
SW7 No. 5 CNG send when manual TX
CNG signal sending ON/OFF in case of manual transmission is set.
SW7 No. 6 Protocol monitor
Normally set to "0". If set to "1", communication can be checked, in case
of troubles, without using a G3 tester or other tools.
When communication FSK data transmission or reception is made, the
data is taken into buffer. When communication is finished, the data
analyzed and printed out. When data is received with the line monitor
(SW7-No. 7) set to "1" the reception level is also printed out.
SW7 No. 7 Line monitor
Normally set to "0". If set to "1", the transmission speed and the recep-
tion level are displayed on the LCD. Used for line tests.
SW7 No. 8 Reserved
Set to "0".
SW8 No. 1, No. 2 Compromised equalizer
The specific line equalizer is inserted.
No. 1 No. 2
0 0 The line equalizer built in the modem is turned off.
0 1 Line equalizer corresponding to 1.8 km
1 0 Line equalizer corresponding to 3.6 km
0 1 Line equalizer corresponding to 7.2 km
SW8 No. 3 H2 mode
Used to determine H2 mode (15sec transmission mode). When set to
OFF, H2 mode is inhibited even though the transmitting machine has
H2 mode.
SW8 No. 4 ~ No. 8 Signal transmission level
Used to control the signal transmission level in the range of –0dB to
–31dB.
SW9 No. 1, No. 2 CED tone signal interval
For international communication, the 2100Hz CED tone may act as an
echo suppresser switch, causing a communication problem. Though this
soft switch is normally set to "0", it should be set to "1" so as to change
the time between CED tone and DIS signal from 75ms to 500ms to
eliminate the communication problem caused by echo.
SW9 No. 3 Equalizer freeze
This switch is used to perform reception operation by fixing the equal-
izer control of modem for the line which is always in an unfavorable
state and picture cannot be received. Usually, the control is executed
according to the state of line where the equalizer setting is changed
always.
SW9 No. 4 Equalizer freeze conditions
Setting which specifies SW9 No.3 control only in condition of 7200bps
modem speed.
SW9 No. 5 CED detection time
The detection time of the CED signal from the called side in the auto
calling mode is set.
SW9 No. 6, No. 7 Alarm buzzer
The length of the buzzer for normal end of operation is set.
SW9 No. 8 Action when RTN received
The operation is set when the RTN signal is received in the G3 transmis-
sion mode.
SW10 No. 1 ~ No. 4 Memory retransmission times
The number of memory retransmissions is set.
SW10 No. 5 ~ No. 8 Memory retransmission interval
The interval between memory retransmissions is set.
SW11 No. 1 ~ No. 4 V.34 mode transmission speed
Used to determine the initial modem speed when communication method
is V.34 transmission mode.
SW11 No. 5 ~ No. 8 V.34 mode receiving speed
Used to determine the initial modem speed when communication method
is V.34 reception mode.
SW12 No. 1 V.34 mode function in case of manual communication
Used to select whether the V.34 mode is made valid when automatically
transmitting/receiving.
SW12 No. 2 V.34 mode function
Used to select the V.34 mode for communication when set to “1”, com-
munication method is V.34 mode..
SW12 No. 3 V.34 control channel communication speed
Used to select the control channel communication speed for V.34 mode.
SW12 No. 4, No. 5 EOL detection timer
Used to make a choice of whether to use the 25-second or 13-second
timer for detection of End of line This is effective to override communica-
tion failures with some facsimile models that have longer End of line
detection.
SW12 No. 6, No. 7 Processing of DIS reception after DIS transmis-
sion
When receiving , operation in case of DIS reception after DIS transmis-
sion is selected. Retransmitting command: To retransmit DIS in disre-
gard of DIS reception.
Breaking circuit: To break circuit instantly. (Abnormal finish)
T. 30: To operate in accordance with T.30.
T. 30+
α
: To operate in accordance with T.30+
α
. (To operate differently
according to cases.)
SW12 No. 8 The change to DB from DP by
When setting to 1, the mode is changed by pressing the
key from the
pulse dial mode to the tone dial mode.
SW13 No. 1 ~ No. 5 DTMF output level (High)
To set the level to output high group DTMF signals. –15 to 0 dBm (0.5
dBm unit)
SW13 No. 6 ~ No. 8 Reserved
Set to "0".
SW14 No. 1 ~ No. 5 DTMF output level (Low)
To set the level to output low group DTMF signals. –15 to 0 dBm (0.5
dBm unit)
SW14 No. 6 ~ No. 8 Reserved
Set to "0".
SW15 No. 1 ~ No. 4 Reserved
Set to "0".
SW15 No. 5 ~ No. 8 Cl signal OFF detect enable time
Used to set the continuous detection time during OFF period of Cl sig-
nal.
SW16 No. 1 ~ No. 4 Reserved
Set to "0".
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