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10. Circuit Description & Diagram
10-1. Circuit Description
10-1-1. General Description
1. Main PBA
The main PBA is the board that provides mechanical and board control signal which includes the modem block.
cis
TPH
MOTOR
SPEAKER
BUZZER
POWER
* SUPPLY
MAIN PBA
D.DET
P-EMPTY
PBA
PBA
eee
HOOK PBA
[Fig. 1]
DAUGHTER
PBA
LIU PBA
2. LIU / Daughter PBA
This PBA is controls connection of the telephone line to the unit, and also telephone functions including dialing. Daughter
board is composed of ringer parts, two slide switch and modular jacks for connection of tel line.
3. Operating Panel PBA
The OPE(operating) PBA is composed of LEDs, keypad, and their control signal. The circuit is divided into key sensing
parts to receive user's command and LED display part to report the user of machine's status.
4. Power Supply ..
The Power Supply supplies +5V, —12V, and +24V to the control board.
The +24V is provided power to motor, TPH, and relay.
The 24CTL is subjected to on/off control of 24V power from the main PBA.
5. D. DET PBA
This small PBA is composed of sensors in order to detect the feeding of document.
6. P. Empty PBA
This is the board which is used to detect the presence of the recording paper using the reflect type photo interruptor.
7. Hook PBA
This PBA is composed of hook switch in order to detect handset status.
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