Circuit Operating Principles; Power Supply Voltage - Epson DLQ-3000+ Service Manual

2.2 Circuit Operating Principles

The power source of this printer is composed of the power switch, AC cable and C124
PSB/PSE board. It supplies DC voltage used to control the printer operation.

2.2.1 Power Supply Voltage

The electrical circuit of this printer uses an RCC (ringing choke converter) type switching
regulator, which outputs DC voltage required to operate the printer. DC voltage is divided
into 3 blocks: +35 VDC (CH. A), +35 VDC (CH. B) and +5 VDC, as listed below.
Voltage level Connector No.

+35 VDC 10%

+5 VDC 5%
Rev. A
Table 2-9. DC Voltage Application
CN2 CH. A
CH. B
CN3 Logic
Application

CR motor

Printhead drive voltage

Printhead

Cooling fan motor

PF motor

Ribbon motor

Vpp of the flush memory

Hold voltage for the PF motor

Hold voltage for the ribbon motor

Serial I/F level converter

Type-B I/F power supply voltage

I/F power supply
Operating Principles
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