Service manual

CHAPTER 3 THEORY OF OPERATION

3-18

1.5 Power Supply

1.5.1 Low-voltage power supply

The power supply uses a switching regulation system to generate the regulated DC power

(+3.3V, +8V [non regulated] and +24V), which are converted from the AC line.

The regulated output and the production code of each power supply are listed below;

Regulated Output Production Code

+3.3V / 1.5A

+8V / 0.4A

+24V / 2.2A

100V: MPW5806

200V: MPW5706

For the circuit diagram of the low-voltage power supply PCB, see APPENDIX 11. or 12. ‘LOW-

VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM’ in this manual.

Heater

Circuit

Thermal

Fuse

Feedback

Line

Filter

Fuse

Rectifier

Oscillator

24V

Regulation

Circuit

24V

3.3V

Lamp

(Heater)

(Engin Circuit / Main Circuit)

3.3V

Regulation

Circuit

Lightning

Surge

Absorber

Fuse

Fig. 3-29