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This section is the interface between the telephone line and external telephone. It is composed of an EXT. TEL line relay (RLY100),
bell detection circuit, TAM interface circuit and line amplifier.

1. Circuit Operation

Normally, this relay switches to the external telephone side and switches to the open side while OFF-HOOK.
IC300 (R33) High Level

→Q100 ON→RY100 (ON)

1. Circuit Operation

The signal waveform is indicated below. The bell signal input to  IC101 and ring detected signal output from pin 16 of IC100.
IC300 monitor this signal and judged as bell.
TEL LINE

→IC101 (8,9 - 5,6)→IC100 (9,10 - 16)→IC300(AH32 and AN26)

1. Function

This unit is compatible with the Caller ID service offered by your local telephone company. To use this feature, you must sub-
scribe to a Caller ID service. The data for the caller ID from the telephone exchange is sent during the interval between the
first and second rings of the bell signal. The data from the telephone exchange is a modem signal which is modulated in an
FSK (Frequency Shift Keying) format. Data “0” is a 1200 Hz sine wave, and data 1 a 2200 Hz sine wave.
There are two type of the message format which can be received: i.e.the single data message format and multiple data mes-
sage format.
The multiple data format allows to transmit the name and data code information in addition to the time and telephone number
data.
When there is multiple data in the unit, the name or telephone number are displayed.

2. Circuit Operation

The caller ID signal input from TEL LINE is processed with Soc (IC300).
TEL LINE

→IC101 (8,9 - 5,6)→IC100 (9,10 - 5)→IC300(AK33)

1. Function

Another telephone connected to same line activates the unit to the FAX mode by using a DTMF signal.

2. Signal Path

TEL LINE

→IC101 (8,9 - 5,6)→IC100 (9,10 - 5)→IC300(AK33)

This circuit is to switch between FAX receiving and the external TAM’s message recording automatically. 
For details, please refer to TAM Interface Section (P.30).

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The general ITS operation is performed by IC200 which has a handset circuit. The alarm tone, the key tone, and the beep are
output from Soc IC300.

1. Function

This is the function when you are not holding the handset and can hear the caller’s voice from the line.

2. Circuit Operation

(Telephone Monitor Signal Path)
Signals received from the telephone line are output through at the speaker via the following path.

3. Signal Path

TEL LINE

→D103→Q104→C106→IC101(3-5,6)→IC100(9,10-5)→IC300(AK33-AK34)→IC200(4-1)→IC202(2-1)

→IC204(4-5,8)→CN200(1,2)→SPEAKER

1. Function

This circuit controls the conversation over the handset, i.e. the transmitted and received voices to and from the handset.

2. Signal Path (Transmission signal)

HANDSET UNIT

→CN17(4,6)→CN201(4,6)→IC202(5,6-7)→IC201(3-5)→IC200(10-5)→IC300(AJ32-AL34)

→IC100(6-9,10)→IC101(5,6-3)→C106→Q104→D103→TEL LINE

3. Signal path (Reception signal)

TEL LINE

→D103→Q104→C106→IC101(3-5,6)→IC100(9,10-5)→IC300(AJ32-AL34)→IC200(4-16)→IC203(4-8)

→CN201(1,2)→CN17(1,2)→HANDSET UNIT

1. Function

This circuit monitors various tones, such as (1) DTMF tone, (2) Alarm/Beep/Key tone/Bell.

2. Signal Path

a. DTMF MONITOR

(Speaker Operation)
IC300(AK34)

→IC200(4-1)→IC202(2-1)→IC204(4-5,8)→CN200(1,2)→SPEAKER

(Handset Operation)
IC300(AK34)

→IC200(4-16)→IC203(4-8)→CN201(1,2)→CN17(1,2)→HANDSET UNIT

b. ALARM/BEEP/KEY TONE/BELL

IC300(W34)

→IC202(2-1)→IC204(4-5,8)→CN200(1,2)→SPEAKER

1. Function

When TAM is connected to this unit, the unit receives documents for FAX calls or the external TAM records a voice message
automatically.

2. Circuit Operation

The TAM INTERFACE circuit consists of Soc(IC600) to detect the other party CNG signal, and RLY100 to separate EXT.TAM.

a. CNG signal detection circuit

The CNG signal from the other party’s FAX is detected in Soc IC300 
(Signal path)
TEL LINE

→IC101 (8,9 - 5,6)→IC100 (9,10 - 5)→IC300(AK33)

b. Remote receiving

This is the parallel-connected DTMF signal for the TEL or EXT.TEL mode between T and R. When the other party is a
FAX, the unit switches to FAX receiving.
(Signal Path)
TEL LINE

→IC101 (8,9 - 5,6)→IC100 (9,10 - 5)→IC300(AK33)

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The scanning block of this device consists of a control circuit and a CIS (contact image sensor), and AFE (Analog Front End)
include A/D Converter.

When an original document is inserted and the start button pressed, pin AL21 of IC300 goes to a low level and the transistor Q518
turns on. This applies voltage to the CIS. The CIS is driven by each of  the CCDSH , CCDCLK  signals output from IC300, and the
original image illuminated by the LED to output an analog image signal. 
The analog image signal is input to the AFE on VINP(20pin of IC503) and converted into 16-bit data by the A/D converter inside
IC503. Then this signal undergoes digital processing in order to obtain a high-quality image.

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1. Functions

All driving forces of printer engine part are supplied by this engine motor.
Engine motor is controlled so as to rotate at constant speed during printing and copying.

2. Motor operation

<Start operation>
In order to start the motor rotation, following 3 signals are supplied from IC300.
1. SS signal (Output pin: Pin AN29/Output Signal: "H")
When this signal is inverted by transistor Q502 and becomes "L", motor recognize this signal as "start" signal.
2. Clock signal (Output pin: Pin AL27/Output Signal: Pulse)
Pulse frequency :approx. 1.93KHz (at normal printing speed, )
Pulse frequency :approx. 0.96KHz.(at half printing speed)
This signal is also inverted by transistor Q525, and supplied to motor as "clock" signal .
3. Brake signal (Output pin: Pin AL29/Output Signal: "H")
When this signal is inverted by transistor Q526 and becomes "L", motor recognize this signal as "brake off" signal.

When motor reaches constant speed, "L" signal is supplied from motor to IC300 pin AM29 as "Lock detect (LD)" signal.
if "LD" signal does not becomes "L" within predetermined period after "SS" signal becomes "H",  or if "LD" signal becomes
"H" during rotation, it is judged that motor Error occurred.

Timing Chart of Start operation