Sharp FO-77, Service Manual

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FO-77U
UX-66U
• Soft switch function description
SW-A1 No. 1 Protect from echo
Used to protect from echo in reception.
SW-A1 No. 2 Forced 4800BPS reception
When line conditions warrant that receptions take place at 4800 BPS
repeatedly.
It may improve the success of receptions by setting at 4800BPS.
This improves the receiving document quality and reduces handshake
time due to fallback during training.
SW-A1 No. 3 Footer print
When set to "1", the date of reception, the sender machine No., and the
page No. are automatically recorded at the end of reception.
SW-A1 No. 4 Length limitation of copy/send/receive
Used to set the maximum page length.
To avoid possible paper jam, the page length is normally limited to 0.6
meter for copy or transmit, and 1.5 meters for receive.
It is possible to set it to "No limit" to transmit a long document, such as a
computer print form, etc. (In this case, the receiver must also be set to
no limit.)
SW-A1 No. 5 CSI transmission
(CSI TRANSMISSION) is a switch to set whether the machine sends or
does not send the signal (CSI signal) informing its own telephone No. to
the remote fax machine when information is received. When "nonsending"
is set, the telephone No. is not output on the remote transmitting ma-
chine if the remote transmitting machine has the function to display or
print the telephone No. of receiving machine, using this CSI signal.
SW-A1 No. 6 DIS receive acknowledgment during G3 transmission
Used to make a choice of whether reception of DIS(NSF) is acknowl-
edged after receiving two DISs(NSFs) or receiving one DIS (two NSFs).
It may be useful for overseas communication to avoid an echo suppres-
sion problem, if set to 1.
SW-A1 No. 7 Non modulated carrier for V29 transmission mode
Though transmission of a nonmodulated carrier is not required for trans-
mission by the V29 modem according to the CCITT Recommendation, it
may be permitted to a send nonmodulated carrier before the image sig-
nal to avoid an echo suppression problem.
It may be useful for overseas communication to avoid an echo suppres-
sion problem, if set to 1.
SW-A1 No. 8 Reserved
Set to "1".
SW-A2 No. 1 ~ No. 4 Modem speed
Used to set the initial modem speed. The default is 9600BPS.
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 fallback
procedure.
SW-A2 No. 5 Reserved
Set to "1".
SW-A2 No. 6 H2 mode
Used to determine reception of H2 mode (15 sec transmission mode).
When set to OFF, H2 mode reception is inhibited even though the trans-
mitting machine has H2 mode function.
SW-A2 No. 7 Communication error treatment in RTN sending mode
(Reception )
Used to determine communication error treatment when RTN is sent by
occurrence of a received image error in G3 reception. When it is set to
"1", communication error is judged as no error.
SW-A2 No. 8 CNG transmission
When set to "0", this model allows CNG transmission by pressing the
Start key in the key pad dialing mode. When set to "1", CNG transmis-
sion in the key pad dialing mode cannot be performed. In either case,
CNG transmission can be performed in the auto dial mode.
2 – 13
TX RX
CED
DIS
T
SW-A3 No. 1, No. 2 CED tone signal interval
For international communication, the 2100Hz CED tone may act as an
echo suppression switch, causing a communication problem.
Though SW-A3 No. 1 and No. 2 are normally set to 0, this selfing is used
to change the time between the CED tone signal to eliminate the com-
munication caused by echo.
SW-A3 No. 3 MR coding
Used to select the MR coding enable or disable.
SW-A3 No. 4 ~ No. 8 Reserved
Set to "0".
SW-A4 No. 1 ~ No. 5 Signal transmission level
(0~-31 dBm setting by 1dBm step)
Used to control the signal transmission level in the range of -0dB to
-31dB.
The factory setting is at -10dB (MODEM output).
SW-A4 No. 6 Protocol monitor (Error Print)
If set to "1", protocol is printed at communication error.
SW-A4 No. 7 Protocol monitor
Normally set to "0". If set to "1", communication can be checked, in case
of trouble, without using a G3 tester or other tools.
When communication FSK data transmission or reception is made, the
data is taken into the buffer. When communication is finished, the data is
analyzed and printed out. When data is received with the line monitor
(SW4-No. 8) set to "1" the reception level is also printed out.
SW-A4 No. 8 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.
SW-A5 No. 1, No. 2 Digital equalization setting (Reception)
Line equalization when reception is to be set according to the line char-
acteristics.
Setting should be made according to distance between the telephone
and the telephone company central switching station.
SW-A5 No. 3, No. 4 Digital equalization setting (Transmitter)
Line equalization when transmission is to be set according to the line
characteristics.
Setting should be made according to distance between the telephone
and the telephone company central switching station.