DOWNLOAD Panasonic KX-FC253UA-T / KX-FC258RU-T Service Manual ↓ Size: 9.28 MB | Pages: 127 in PDF or view online for FREE

37

Note 1 - Standard facsimile units conforming to T.2 must have the following capability : Index of cooperation (IOC)=264.
Note 2 - Standard facsimile units conforming to T.3 must have the following capability : Index of cooperation (IOC)=264.
Note 3 - Standard facsimile units conforming to T.4 must have the following capability : Paper length=297 mm.

40

Extend field

Extend field

41

R8

×15.4 lines/mm

R8

×15.4 lines/mm

42

300

×300 pels/25.4 mm

300

×300 pels/25.4 mm

43

R16

×15.4 lines/mm and/or 400×400 pels/25.4 mm

R16

×15.4 lines/mm and/or 400×400 pels/25.4 mm

44

Inch based resolution preferred

Resolution type selection
"0": neritic based resolution
"1": inch based resolution

45

Metric based resolution preferred

Don’t care

46

Minimum scan line time capability for higher resolutions
"0": T

15.4

 = T

7.7

       "1": T

15.4

 = 1/2T

7.7

Don’t care

47

Selective Polling capability

Set to "0".

48

Extend field

Extend field

Signal

Identification Signal Format

Function

Training 1

———————

A fixed pattern is transmitted to the receiving side at a speed (2400 to 9600 bps)
designated by DCS, and the receiving side optimizes the automatic equalizer,
etc., according to this signal.

TCF
(Training Check)

———————

Sends 0 continuously for 1.5 seconds at the same speed as the training signal.

CFR 
(Confirmation to Receive)

X0100001

Notifies the sending side that TCF has been properly received. If  TCF is not
properly received, FTT (Failure To Train) X0100010 is  relayed to the sender.
The sender then reduces the transmission  speed by one stage and initiates
training once again.

Training 2

———————

Used for reconfirming the receiving side like training 1.

Image Signal

Refer to the next page.

———————

RTC
(Return to Control)

———————

Sends 12 bits (0...01 

× 6 times) to the receiver at the same speed as the image

signal and notifies completion of transmission of the first sheet.

EOP
(End of Procedure)

X1110100

End of one communication

MCF
(Message Confirmation)

X0110001

End of 1 page reception

DCN
(Disconnect)

X1011111

Phase E starts.

MPS
(Multi-Page Signal)

X1110010

Completion of transmission of 1 page. If there are still more documents to be
sent, they are output instead of EOP. After MCF reception, the sender transmits
an image signal of the second sheet.

PRI-EOP
(Procedural Interrupt-EOP)

X1111100

If there is an operator call from the sender, it is output after RTC.

PIP
(Procedural Interrupt Positive)

X0110101

This is output when an operator call is received.

Bit No.

DIS/DTC

DCS

38

This unit uses one-dimensional MH format.

39

The modem (IC3) has all the hardware satisfying the CCITT standards mentioned previously. 
When the ASIC IC10 (61) is brought to a low level, the modem (IC3) is chip-selected and the resistors inside IC are selected by the
select signals from ASIC (IC10) ADR0-ADR4. The commands are written through the data bus, and all the processing is controlled
by the ASIC (IC10) according to CCITT procedures. The INT signal dispatched from IRQ (pins 100 of IC3) to ASIC (IC10) when the
transmission data is accepted and the received data is demodulated, the ASIC (IC10) implements post processing. This modem
(IC3) has an automatic application equalizer. 
With training signal 1 or 2 during G3 reception, it can automatically establish the optimum equalizer. The modem (IC3) operates
using the 32.256 MHz clock (X1).

1. Facsimile Transmission

The digital image data on the data bus is modulated in the modem (IC3), and sent from pin 56 via, amplifier IC102 and the NCU
section to the telephone line.
Refer to Check Sheet for Signal Route (P.129).

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 (IC3). The signals that enter pin 47 of the modem (IC3) 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 for Signal Route (P.129).

40

It is composed of bell detection circuit, pulse dial circuit, line amplifier, sidetone circuits.

1. Circuit Operation

The signal waveform for each point is indicated below. The signal (low level section) input to pin 10 of BBIC IC4 on the digital
board.
TEL LINE 

→ PC101 (1, 2 → 4) → IC4 (10)

Normally (ON-HOOK condition), LINE RELAY (RL101) and Opt Isorator (PC102) is OFF. While OFF-HOOK, RL101 and PC102
turns ON. This LINE RELAY is controlled by pin 83 of IC4 through the Q101. PC102 is controlled by pin 12 of IC4 through the
Q104.
ON-HOOK:
IC4 (83) Low Level 

→ Q101 OFF → RL101 OFF 

OFF-HOOK:
IC4 (83) High Level 

→ Q101 ON → RL101 ON 

The pulse dial is generated by operating the transistor PC102 while OFF-HOOK (RL101 ON) condition.
Make state:
IC4 (83) High Level 

→ Q101 ON → RL101 ON

Break state:
IC4 (83) Low Level 

→ Q101 OFF → RL101 OFF

1. Circuit Operation

The reception signal output from the line transformer T101 is input to pin (2) of IC101 via C130, R138 and then the signal is
amplified at pin (1) of IC101 and sent to the reception system at through the LPF.

1. Function

This circuit detects the signal (cuts the current) output from the converter when the other party finishes ICM recording and