Panasonic KX-FLC413UA Service Manual ▷ View online
25
KX-FLC413UA
6.3.2.
RTC Backup Circuit
1. Function
This unit has a lithium battery (BAT101) which works for the Real Time Clock IC (RTC: inside IC106).
The RTC continues to work, backed up by a lithium battery even when the power switch is OFF.
The RTC continues to work, backed up by a lithium battery even when the power switch is OFF.
2. RTC Inside (IC106) Backup Circuit Operation
When the power switch is turned ON, power is supplied to the RTC (inside IC106). At this time, the voltage at pin 10 of the
IC106 is +3.3V. When the power switch is turned OFF, the BAT101 supplies power to RTC through D108. The voltage at pin
10 of IC106 is about +2.5V. When the power switch is OFF and the voltage of +3.3V decreases, pin 10 of RTC (IC106)
becomes roughly the same voltage as the battery voltage. RTC goes into the backup mode, in which the power consumption
is lower.
IC106 is +3.3V. When the power switch is turned OFF, the BAT101 supplies power to RTC through D108. The voltage at pin
10 of IC106 is about +2.5V. When the power switch is OFF and the voltage of +3.3V decreases, pin 10 of RTC (IC106)
becomes roughly the same voltage as the battery voltage. RTC goes into the backup mode, in which the power consumption
is lower.
76
VSS
0V
GND
GND
77
VIN0/IP20(APC)
I
3.3V
INPUT TO INVERTER
78
VIN1/IP21
I
3.3V
INPUT TO INVERTER
79
VIN2/IP22
I
3.3V
INPUT TO INVERTER
80
VOUT0/OP25
O
5V
OUTPUT FROM INVERTER
81
VOUT1/OP26
O
5V
OUTPUT FROM INVERTER
82
VOUT2/OP27
O
5V
OUTPUT FROM INVERTER
83
RM0
O
5V
RX MOTOR CONTROL
84
RM1
O
5V
RX MOTOR CONTROL
85
RM2
O
5V
RX MOTOR CONTROL
86
RM3
O
5V
RX MOTOR CONTROL
87
RXE
O
5V
NOT USED
88
5V
5V
5V
POWER SOURCE
89
VSS
0V
GND
GND
90
IOP57
O
5V
NOT USED
91
FANDET1/IOP14
I
5V
DETECT FAN ROTATION
92
FANON1/IOP15
O
5V
FAN CONTROL
93
FANDET2/IOP16
O
5V
NOT USED
94
FANON2/IOP17
O
5V
FAN CONTROL
95
IOP60/CSI
O
5V
BBIC CONTROL (T-PAT0)
96
IOP61/CCLK
O
5V
BBIC CONTROL (T-PAT1)
97
IOP62/CSO
O
5V
NOT USED (CDL_RESRV1)
98
SENCTL0/IOP04
O
5V
LED CONTROL FOR EXIT SENSOR
99
SENCTL1/IOP05
O
5V
LED CONTROL FOR REGIST SENSOR
100
5V
5V
5V
POWER SOURCE
PIN
No.
SIGNAL
I/O
POWER SUPPLY
VOLTAGE
EXPLANATION
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KX-FLC413UA
6.3.3.
Modem Circuit Operation
The modem (IC111) has all the hardware satisfying the CCITT standards mentioned previously.
When the ASIC IC106 (114) is brought to a low level, the modem (IC111) is chip-selected and the resistors inside IC are selected by
the select signals from ASIC (IC106) ADR0-ADR4(pin 84~88). Commands are written through the data bus, and all processing is
controlled by the ASIC (IC106) according to CCITT procedures. Here, the INT signal dispatched from IRQ (pin 100 of IC111) to the
ASIC (IC106) implements post processing.
This modem (IC111) has an automatic application equalizer. With training signal 1 or 2 at the time of G3 reception, it can automati-
cally establish the optimum equalizer. The modem (IC111) operates using the 32.256MHz clock (X105).
When the ASIC IC106 (114) is brought to a low level, the modem (IC111) is chip-selected and the resistors inside IC are selected by
the select signals from ASIC (IC106) ADR0-ADR4(pin 84~88). Commands are written through the data bus, and all processing is
controlled by the ASIC (IC106) according to CCITT procedures. Here, the INT signal dispatched from IRQ (pin 100 of IC111) to the
ASIC (IC106) implements post processing.
This modem (IC111) has an automatic application equalizer. With training signal 1 or 2 at the time of G3 reception, it can automati-
cally establish the optimum equalizer. The modem (IC111) operates using the 32.256MHz clock (X105).
1. Facsimile Transmission/DTMF Line Send
The digital image data on the data bus is modulated in the modem (IC111), and sent from pin 56 via modem IC111, amplifier
IC204(6
IC204(6
→7) and the NCU section to the telephone line.
Refer to Check Sheet (P.122).
2. Facsimile Reception
The analog image data which is received from the telephone line passes through the NCU section and enters pin 47 of the
modem (IC111). The signals that enter pin 47 of the modem (IC111) are demodulated in the board to digital image signals,
then placed on the data bus.
In this case, the image signals from the telephone line are transmitted serially. Hence, they are placed on the bus in 8 bit units.
Here, the internal equalizer circuit reduces the image signals to a long-distance receiving level.
This is designed to correct the characteristics of the frequency band centered around 3 kHz and maintain a constant receiving
sensitivity.
It can be set in the service mode.
Refer to Check Sheet (P.122).
modem (IC111). The signals that enter pin 47 of the modem (IC111) are demodulated in the board to digital image signals,
then placed on the data bus.
In this case, the image signals from the telephone line are transmitted serially. Hence, they are placed on the bus in 8 bit units.
Here, the internal equalizer circuit reduces the image signals to a long-distance receiving level.
This is designed to correct the characteristics of the frequency band centered around 3 kHz and maintain a constant receiving
sensitivity.
It can be set in the service mode.
Refer to Check Sheet (P.122).
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KX-FLC413UA
6.4.
Modem Section
6.4.1.
Function
The unit uses MODEM (IC111) that serves as an interface between the control section for FAX transmission and reception and
the telephone line. During a transmitting operation, the digital image signals are modulated and sent to the telephone line.
During a receiving operation, the analog image signals which are received via the telephone line are demodulated and con-
verted into digital image signals. The communication format and procedures for FAX communication are standardized by ITU-T.
MODEM has hardware which sends and detects all of the necessary signals for FAX communication.
It can be controlled by writing commands from the ASIC (IC106: inside ASIC).
This MODEM also sends DTMF signals, generates a call tone (from the speaker), and detects a busy tone and dial tones.
the telephone line. During a transmitting operation, the digital image signals are modulated and sent to the telephone line.
During a receiving operation, the analog image signals which are received via the telephone line are demodulated and con-
verted into digital image signals. The communication format and procedures for FAX communication are standardized by ITU-T.
MODEM has hardware which sends and detects all of the necessary signals for FAX communication.
It can be controlled by writing commands from the ASIC (IC106: inside ASIC).
This MODEM also sends DTMF signals, generates a call tone (from the speaker), and detects a busy tone and dial tones.
Overview of Facsimile Communication Procedures (ITU-T Recommendation):
1. ON CCITT (International Telegraph and Telephone Consultative Committee)
The No. XIV Group of ITU-T, one of the four permanent organizations of the International Telecommunications Union (ITU),
investigates and make recommendations on international standards for facsimiles.
investigates and make recommendations on international standards for facsimiles.
2. Definition of Each Group
• Group I (G1)
Official A-4 size documents without using formats which reduce the band width of a signal are sent over telephone lines.
Determined in 1968.
Transmission for about 6 minutes at a scanning line density of 3.85 lines/mm.
Determined in 1968.
Transmission for about 6 minutes at a scanning line density of 3.85 lines/mm.
• Group II (G2)
Using reduction technology in the modulation/demodulation format, an A-4 size document is sent at an official scanning line
density of 3.85 lines/mm for about 3 minutes.
Methods to suppress redundancy are not used.
Determined in 1976.
density of 3.85 lines/mm for about 3 minutes.
Methods to suppress redundancy are not used.
Determined in 1976.
• Group III (G3)
Method of suppressing redundancy in the image signal prior to modulation is used. An A-4 size document is sent within
about one minute.
Determined in 1980.
about one minute.
Determined in 1980.
• Group IV (G4)
Transmission is via the data network. A method is provided for suppressing redundancy in signals prior to transmission, and
error-free reception of transmission is possible.
The scope of these facsimile applications is not limited simply to transmission of written statements. Through symbiotic link-
ages with other communication methods, it can be expected to expand to include integrated services.
error-free reception of transmission is possible.
The scope of these facsimile applications is not limited simply to transmission of written statements. Through symbiotic link-
ages with other communication methods, it can be expected to expand to include integrated services.
3. Facsimile Call Time Series
As shown in the following diagram, the facsimile call time series is divided into five phases.
Phase A: Call setting
Call setting can be manual/automatic.
Phase B: Pre-message procedure
Phase B is a pre-processing procedure and sequence for confirming the status of the terminal, transmission route, etc., and
for terminal control. It implements terminal preparation status, determines and displays terminal constants, confirms synchro-
nization status, etc. and prepares for transmission of facsimile messages.
Phase C: Message transmission
Phase C is the procedure for the transmitting facsimile messages.
Phase D: Post message procedure
Phase D is the procedure for confirming that the message is completed and received. For continuous transmission, phase B
or phase C is repeated for transmission.
Phase E: Call retrieval
Phase E is the procedure for call retrieval, that is for circuit disconnection.
Call setting can be manual/automatic.
Phase B: Pre-message procedure
Phase B is a pre-processing procedure and sequence for confirming the status of the terminal, transmission route, etc., and
for terminal control. It implements terminal preparation status, determines and displays terminal constants, confirms synchro-
nization status, etc. and prepares for transmission of facsimile messages.
Phase C: Message transmission
Phase C is the procedure for the transmitting facsimile messages.
Phase D: Post message procedure
Phase D is the procedure for confirming that the message is completed and received. For continuous transmission, phase B
or phase C is repeated for transmission.
Phase E: Call retrieval
Phase E is the procedure for call retrieval, that is for circuit disconnection.
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KX-FLC413UA
4. Concerning Transmission Time
Transmission Time = Control Time + Image Transmission Time + Hold Time
Transmission time consists of the following.
Control time:
Control time:
This is time at the start of transmission when the functions at the sending and receiving sides are confirmed, the
trans-
mission mode is established, and transmission and reception are synchronized.
Image transmission time:
This is the time required for the transmission of document contents (image data). In general, this time is recorded in the
catalog, etc.
catalog, etc.
Hold time:
This is the time required after the document contents have been sent to confirm that the document was actually sent, and
to check for telephone reservations and/or the existence of continuous transmission.
to check for telephone reservations and/or the existence of continuous transmission.
5. Facsimile Standards
6. Explanation of Communication and Compression Technology
a. G3 Communication Signals (T. 30 Binary Process)
For G3 Facsimile communication, this is the procedure for exchanging control signals between the sending and receiving
Item
Telephone Network Facsimile
G3 Machine
Connection Control Mode
Telephone Network Signal Mode
Terminal Control Mode
T. 30 Binary
Facsimile Signal Format
Digital
Modulation Mode
PSK (V. 27 ter) or QAM (V. 29)
Transmission Speed
300 bps (Control Signal)
2400, 4800, 7200, 9600, 12000, 14400 bps (FAX Signal)
2400, 4800, 7200, 9600, 12000, 14400 bps (FAX Signal)
Redundancy Compression
Process
(Coding Mode)
Process
(Coding Mode)
1 dimension: MH Mode
2 dimension: MR Mode (K=2.4)
2 dimension: MR Mode (K=2.4)
Resolution
Main Scan: 8 pel/mm
Sub Scan: 3.85, 7.7l/mm
Sub Scan: 3.85, 7.7l/mm
Line Synchronization Signal
EOL Signal
1 Line Transmission Time
[ms/line]
[ms/line]
Depends on the degree of data reduction.
Minimum Value: 10, 20
Can be recognized in 40ms.
Minimum Value: 10, 20
Can be recognized in 40ms.
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