Board Descriptions
A - 28
OKIOFFICE 44 Serv. Man., P/N 59276801
A3.1.6
R44 Circuit Diagram
1.
Block diagram
The circuit diagram consists of Modem (14.4 kbps).
Modem consists the following functions:
•
Modulation/demodulation
Modulation type:
1)
ITU-T Rec. V17 (14400/12000/9600/7200 bps) for G3 picture data.
2)
ITU-T Rec. V29 (9600/7200 bps) for G3 picture data.
3)
ITU-T Rec. V27 ter (4800/2400 bps) for G3 picture data.
4)
ITU-T Rec. V21 channel 2 (300 bps) for binary signals defined in ITU-T Rec. T.30.
•
Automatic adaptive equalizer for G3 receive data with 300 bps data excluded.
•
Generation of signal tones
•
PB tone (multi-frequency tone) generation
•
Detection of single tones
•
D/A converter for send data (TX)
•
A/D converter for receive data (RX)
•
Amplitude equalizer for RX
•
Selectable attenuation for TX
•
Automatic gain control
Figure A3.1.6 shows the related signals of Modem.
X'tal
CPU
IOGA
Modem
14.4 kbps
AD0 to AD7
A1 to A7
MDINT1-N
MDRST-N
MDCSI-N
MDMRD-N
MDMWR-N
S
7
IC12
IC12
R
RP
CN10
CN3
S
R
NCU
29.4912 MHz
R44
IC8
IC2
A8, B8
A6, B6
Figure A3.1.6 Related Signals of Modem
Summary of Contents for OKIOFFICE 44
Page 2: ...All specifications are subject to change without notice Service Manual OKIOFFICE 44 59276801...
Page 135: ...Disassembly 4 6 OKIOFFICE 44 Service Manual P N 59276801 Whole Unit Picture FX048 CP4 1 Fig 01...
Page 329: ...Illustrated Parts List D 6 OKIOFFICE 44 Service Manual P N 59276801 Section 2 Printer Unit...
Page 331: ...Illustrated Parts List D 8 OKIOFFICE 44 Service Manual P N 59276801 Section 3 Operator Panel...
Page 351: ...Illustrated Parts List D 28 OKIOFFICE 44 Service Manual P N 59276801 Section 12 Cables...
Page 357: ...Board Layout E 2 OKIOFFICE 44 Service Manual P N 59276801 MEM eps E 2 MEM PCB...
Page 358: ...Board Layout E 3 OKIOFFICE 44 Service Manual P N 59276801 TEL U eps E 3 TEL U PCB...
Page 359: ...Board Layout E 4 OKIOFFICE 44 Service Manual P N 59276801 Hook eps E 4 Hook PCB...
Page 388: ...OKIOFFICE 44 Service Manual Part Number 59276801 Printed in the USA...