Service manual

EPSON LX-300+ Revision A

Operating Principles Printer Mechanism (M-3M10) 51

RPE DETECTOR

RPE detector is installed on the paper path at the back of the printer. The table

below shows the RPE detector specifications.

BPE DETECTOR

BPE detector is installed right under the platen. The table below shows the

BPE detector specifications.

2.2.5.1 Page Length Measurement

Page length measurement is a process to convert the following value to the

number of printing lines.

Value = [The number of paper feed pulse from the paper top (top margin:

4.2mm) until RPE detector detects paper end] + [forms over-ride specified

paper feed pulse] - [adjustment value]

 When CSF is used:

The uncertainty of the paper end detector may vary the number of

printing lines within the same paper size. To avoid this, when CSF is

used, page length measurement calculates the printable lines and if

the paper is longer than the printable lines, the number of printing

line is considered the printable lines (fixed value).

When paper is shorter than the printable lines, the printer prints the

fixed number of lines by forms over-ride function (which allows the

fixed number of lines to be printed even when RPE detector detects

paper end).

 When CSF is not used:

When loading paper manually or when tractor feed is used, the

number of printing lines of paper end is determined by forms over-

ride function after BPE or RPE detector detects paper end.

Table 2-11. RPE Detector Specifications

Item Specification

Method Mechanical contact method

Switching rate 0.6 to 1.0 mA, 5 VD±5%

Switching mode

• Paper inside: open