Chapter 2

2.4.6 Maintenance Cartridge Relay PCB

2.4.6.1 Maintenance cartridge relay PCB components

IC 1

F-2-22

a) EEPROM (IC1)

The 128-KB EEPROM stores all information written in the EEPROM on the main controller PCB.

2.4.7 Power Supply

2.4.7.1 Power supply block diagram

Operation panel

Main controller PCB

DC power supply

POWER ON

control circuit

+5V/+3.3V

generation circuit

Power supply

+32V

generation circuit

+5.1V

generation circuit

Transformer

AC inlet

100V to 240V

Noize filter circuit

Rectifying circuit

F-2-23

The power supply converts AC voltages ranging from 100 V to 240 V from the AC inlet to DC voltages for driving the ICs, motor, and others.

The voltage generator circuits include the +32 V generation circuit for driving motors, fans, and the +5.1V generator circuit for driving sensors, logic circuits. When in the power saving mode, the power supply cut outs the +32 V and the +5.1 V.

Power ON/OFF operation is controlled by the main controller PCB. When the upper cover is open, the power supply cut outs only the +32V power to the carriage.

2.5 Detection Functions with Sensors

2.5.1 Cover system

Upper cover lock switch (L) / (R)

The microswitch-based upper cover lock switches detect the open/closed states of the upper cover.

When the upper cover close, the switches are pressed to detect the closed state of the upper cover.

The printer has one switch installed on the left and right sides each to prevent one-sided closure of the upper cover.

Ink tank cover switches (L) / (R)

The microswitch-based ink tank cover switches detect the open/closed states of ink tank covers.

When an ink tank cover closes, the switches are pressed to detect the closed state of the ink tank cover.

Pressure release switch

The microswitch-based pressure release switch detects the status of the paper release lever.

When the paper release lever closes, the switch is pressed to detect the closed state of the paper release lever.

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Canon 2163B002 service manual Detection Functions with Sensors, Power Supply Power supply block diagram, Cover system