EPSON Stylus Color 900

Revision C

After a paper loading motion is completed, the semicircular roller rotates in the normal direction to load the top paper in the stack. This operation is enabled by the correct phase of the gears in the ASF, because the timings for the semicircular roller’s contacting the paper surface by the corner (A) and the hopper’s being pushed out must be coincided. The ASF sensor is used to determine the condition whether the phase is correct or not. The transmission system of the ASF sensor detects the condition by catching the position of the cam attached onto the same shaft as the semicircular roller is. See Table 2-8 and Table 2-9 for the ASF sensor specifications and its switch mode, respectively.

Table 2-8. ASF Sensor Specifications

No.

Item

Specifications

 

 

 

1

Type

Photoelectric transfer system (transmission

type)

 

 

 

 

 

2

Collector voltage

30 VDC or less

 

 

 

3

Coil resistance

5 VDC ± 5%

 

 

 

Table 2-9. ASF Sensor Switch Mode

ASF Position

Sensor Status

 

Sensor Output

 

 

 

 

 

Home position

Open

0.7

VDC or less

 

 

 

 

Off the home

Close

2.4

VDC or more

position

 

 

 

 

 

 

 

P in c h r o lle r

 

H o p p e r

S e m i c i r c u l a r

r o l l eCra m

3 ) 4 )

 

 

A

Note that torque from the pump/ASF motor is transmitted to the pump unit depending on the pump/ASF mechanism condition. The rotational directions and corresponding functions are as shown in Table 2-10.

Table 2-10. ASF/Pump Motor Functions

Direction

Functions for ASF

Functions for the ink

system

 

 

1 )

Normal rotation

• Reverse rotation of the

• Connection to the pump

2 )

(CW)

paper loading roller

 

gear train

 

 

(paper return control)

• Normal rotation of the

R e t u r n leS evpearr a t io n p a d

 

 

 

pump (absorption)

 

 

• Releases the CR lock.

[ R e a d y s t a t u s ] [A c t iv] e

 

 

S t a t u s

 

•

Sets the wiper.

 

Reverse rotation

• Connection to the ASF

• Reverse rotation of the

Figure 2-4. ASF Paper Load Mechanism

(CCW)

gear train

 

pump motor

 

• Normal rotation of the

•

Locks the CR.

 

 

 

 

loading roller (paper

•

Resets the wiper.

 

 

separation, paper

 

 

 

 

loading)

 

 

Operating Principles

Printer Mechanism Operating Principles

50

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Epson SEIJ98006 manual ASF Sensor Specifications, ASF Sensor Switch Mode, ASF/Pump Motor Functions
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