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The general ITS operation is performed by the special IC4 which has a handset circuit. The alarm tone, the key tone, and the
beep are output from the BBIC IC4 (CDL board).

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

Refer to Check Sheet.

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)

Refer to Check Sheet.

3. Signal path (Reception signal)

Refer to Check Sheet.

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)
Refer to Check Sheet.
(Handset Operation)
Refer to Check Sheet.

b. ALARM/BEEP/KEY TONE/BELL

Refer to Check Sheet.

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The scanning block of this device consists of a control circuit and a contact image sensor made up of a celfoc lens array, an LED, a
light guide, and photoelectric conversion elements.

When an original document is inserted and the start button pressed, pin 15 of IC107 goes to a high level and the transistor Q106
turns on.This applies voltage to the LED to light it. The contact image sensor is driven by each of the FTG-F1 signals output from
IC106, and the original image illuminated by the LED undergoes photoelectric conversion to output an analog image signal (SIG).
The analog image signal is input to the system ASIC on AIN1 (pin 3 of IC106) and converted into 8-bit data by the A/D converter

inside IC106. Then this signal undergoes digital processing in order to obtain a high-quality image.

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1. Functions

This motor functions for main operations FAX reception and copy printing.
This feed recording paper synchronized for printing.

2. Motor operation

Excitation pulses is output from G/A (IC107) pins 83, 84, 85 and 86. Then stepping pulses are output from driver IC (IC101)
pin No 2, 7, 8 and 13, and drives the motor coil.
During motor driving, pin 90 of G/A IC107 becomes a low level.
As a result, a current of about 1A are supplied to the motor coil.

FUNCTION

MODE

PHASE PATTERN

SPEED

CURRENT

PRINT

-

2 phase

824pps

1A

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