Epson Photo750 Sensor Check Point, Motor, Coil Resistance, Check Point Signal Level Switch Mode

EPSON Stylus Photo 750Revision A

3.1 Overview

This section describes how to identify and troubleshoot the problems

Table 3-2. Sensor Check Point

when repairing the printer by dividing the troubles into two levels; repair

Sensor Name

Check Point

Signal Level

Switch Mode

and replacement of the assemblies and units, and repair of the

Less than 0.7V

Open (Out of HP

components. Refer to the flowchart below and perform repairing the

range)

HP Sensor

CN4/Pin 1 and 2

component after separating the defective units.

More than 2.4V

Close (Within HP

range)

Less than 0.7V

Open (Paper

PE Sensor

CN5/Pin 1 and 2

exists)

S T A R T

More than 2.4V

Close (No paper)

Open (Paper Feed

U n it L e v e

l T r o u b le s h

o o t in g

Less than 0.7V

Roller home

position)

ASF Sensor

CN6/ Pin 1 and 2

More than 2.4V

Close (Out of home

position)

U n it

R e pUanirit

R e

p aU irnit

R e p a

ir

( P S B / P S (E M) a in

b

(oPa rind)t e r

M e

c h a n is

m )

Thermistor

Head side CN9/

Analog signal

10 K (at 24 °C)

(THM)

Pin 3 and 4

Black cartridge

Head side CN9/

Open (Cartridge is installed)

sensor (COB)

Pin 1 and 4

Close (No Cartridge)

D is a s s e m b le a n d A d ju

s t m e n t

Color cartridge

Head side CN9/

Open (Cartridge is installed)

sensor (COC)

Pin 2 and 4

Close (No Cartridge)

E N D

Figure 3-1.Troubleshooting Flowchart

Table 3-1. Motor, Coil Resistance

Motor

Location

Check Point

Resistance

CR Motor

CN7

Pin 1 and 3

7.8 Ohms ± 10% (at

Pin 2 and 4

25 °C/one phase)

PF Motor

CN8

Pin 1 and 3

8.8 Ohms ±10%

Pin 2 and 4

(at 25 °C/one phase)

Troubleshooting Overview 39