EPSON Stylus PHOTO 810/820/830

Revision B

2.2.1 P/S board

The power supply boards of the Stylus PHOTO 810/820/830 uses a RCC (Ringing Chalk Converter) circuit, which generates +42VDC for drive line and +5VDC for logic line to drive the printer. The application of the output voltage is described below.

Table 2-6. Application of the DC voltages

Voltage

 

Application

 

 

 

• Motors (CR Motor, PF Motor)

+42VDC

Printhead common voltage

 

• Printhead nozzle selector 42V drive voltage

 

 

+5VDC

• C417/C418 Main/Main-B control circuit logic

(Stylus Photo 810/820)

Sensor

 

 

+3.3V DC

• C483/C484 Main-B control circuit logic

(Stylus Photo 820/830)

Sensor

 

 

 

AC voltage input from AC inlet first goes through filter circuit that removes high frequency components and is then converted to DC voltage via the rectifier circuit and the smoothing circuit. DC voltage is then lead to the switching circuit and FET Q1 preforms the switching operation. By the switching operation of the primary circuit, +42VDC is generated and stabilized at the secondary circuit. This +42VDC generated by the secondary circuit is converted to +5VDC by the chopping regulator IC of the secondary circuit.

2.2.1.1 C417 PSB/PSE board

+42VDC

+5VDC

 

PSC Signal from

ZD53

Main board

 

 

 

 

+5VDC Line

 

 

Over Voltage

IC51

 

Limitation

+5V Regulator

ZD52,87

 

 

 

 

+42VDC Line

 

 

 

Over Voltage

ZD91

 

 

Limitation

 

 

 

+42VDC Line

R92,R93,Q91,ZD51

Drop Limitation

 

+42VDC Line

 

 

Constant

 

 

Control

 

C84,Q84

 

 

 

C51

 

 

Power Drop

 

 

 

Delay Circuit

 

Smoothing

 

 

 

Circuit

 

PC1

D51

 

 

Photo Coupler

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TRANS(T1)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C11

 

 

 

Q1

 

 

 

 

Q2,Q31,Q32,Q33

 

 

 

 

 

 

 

Smoothing

 

 

 

Main Switching

 

 

 

Abnormally Feed

 

 

 

 

 

 

Circuit

 

 

 

Circuit

 

 

 

 

 

back circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Over Current

 

Filter Circuit

 

 

Full Wave

 

 

 

 

 

 

 

Protection

 

 

 

Rectifier circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F1,TH1

 

L1,C1

 

DB1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AC Input

Figure 2-17. C417 PSB/PSE board block diagram

The C417 PSB/PSE board has the various control circuits to stop voltage output if a malfunction occurs on the power supply board or the main board while the printer mechanism is on duty. Following explains each control and protection circuit.

Operating Principles

Electrical Circuit Operating Principles

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