Service manual

1 OUTLINE

2-4

DUPLO DF-755 86V-M12D0-0

[1] MC unit (PCB1)

Incorporates a ﬂash ROM for controlling the overall operations of this unit.

The followings are main functions.

a. Overall control

The control program written to the ﬂash ROM controls the overall operations of this unit

(paper feed, folding, paper ejection).

The control program is written in the microprocessor.

b. 5VDC, 24VDC generation

24VDC is used as the power supply for loading and micro switches. 5VDC is used as the

power supply for the controlling system and photo sensors.

Each DC power voltage is generated from 20.5VAC supplied from the transformer (T1).

c. Memory backup

Incorporates one EEPROM (U2) to record a total count.

d. Version up

Upgrades the control program version by changing the ﬂash ROM.

[2] Control panel (PCB2)

Displays the number of folded paper and error messages.

Composed of the LCD, 7-segment window, LED, and push switches.

[3] Transformer (T1)

Transforms an AC input voltage into 20.5VAC, then supplies to the MC unit (PCB1).

[4] AC motor drive unit (PCB3)

Performs a drive control of the AC motor (M1).

Refer to “2.2 Main Motor Control."

[5] Fuse (F1)

The fuse (F1) is mounted on the AC input line and cuts off AC input to the machine when

excess current is present.

[6] Power switch (PSW)

For turning on/off the AC input to the AC motor drive unit (PCB3).

[7] AC motor (M1)

Refer to “2.2 Main Motor Control."

[8] Condenser

Reduces the power supply noise of the AC motor (M1) and stabilize a drive.

[9] Paper sensor (PS1)

Reﬂective sensor

Refer to “3 PAPER FEED SECTION/CONVEYANCE SECTION."

[10] Ejection gate sensor (PS2e, PS2r)

Light receiving/emitting sensor

Refer to “3 PAPER FEED SECTION/CONVEYANCE SECTION."