SHARP SP2149 Technical Report

COPIER(OPTION) : SF-A55

Date

:

Jul. 9, 1997

1. MEASURE TO ALLEVIATE PROBLEMS OF DTD SENSOR ADJUSTMENT ERRORS (U5-03).

2. MEASURE TO PREVENT PROBLEMS OF DAMAGE TO THE HARNESS.

3. MEASURE TO PREVENT PROBLEMS OF DOUBLE FEEDING.

4. MEASURE TO REDUCE THE NOISE FROM THE FAN MOTOR.

5. ESTABLISHMENT OF THE ORIGINAL DOCUMENT TRAY ASSEMBLY OF THE ADF AND THE
RADF AS SERVICE PARTS.

No. : SP-2149

1. Measure to alleviate problems of DTD sensor adjustment errors (U5-03).

1.Model Name: SF-A55

2.General: A change has been carried out in both the sensor PWB and the control PWB. These

changes have been carried out as a measure to alleviate problems of DTD sensor
adjustment errors (U5-03). This measure has been carried out from 1996 September
production, but the parts had not been established as service parts, and therefore they
have now been established as service parts.

3.Description: 1) Change carried out in the Control PWB.

(Old) (New)

0CW2198J205// → 0CW2198K205T/

Changes carried out in the Control PWBs listed above.

(Old) (New)

[R76]: 0CWE70188J122 → 0CWE70188F272
[R133]: 0CWE70014J151 → 0CWE70014J301
[R94]: 0CWE70188J472 → 0CWE70188F472
[R108]: 0CWE70188J222 → 0CWE70188F222
[R122]: 0CWE70188J332 → 0CWE70188F332
[R116]: 0CWE70188J104 → 0CWE70188F104

2) Change carried out in the DTD sensor.
(Old) (New)

0CWE314000549 → 0CWE314000598

The changes described in and above have been carried out as a measure to improve
the performance of the sensor, by resulting in a decrease in the margin of variance in
the sensitivity of the sensor, as well as improving the actual sensitivity itself.

SHARP CORPORATION Reprography Division

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Green

C

3) In accordance with the changes described in and above, a change has been carried

out in the color of the sensor interface harness as a measure to distinguish the old parts
from the new parts.

Sensor interface harness 0CW2198K216// → 0CW2198K216D/

When carrying out replacement operations on the old PWBs, replacement should be
carried out at the same time on both the sensor and the control PWB. The old sensor
interface harness is interchangeable with the new sensor interface harness.

4.Action: From 1996 September production.

2. Measure to prevent problems of damage to the harness.

1.Model Name: SF-A17/A18

2.General: The harness is fixed to the round hole section of the paper delivery side plate in the

reversion transport section, but there were problems of the harness biting into the round
hole section, which can result in damage to the harness. As a measure to alleviate this
problem, a change has been carried out in the harness. The new harness is encased in
a tube for protection.

Tube, added in one location

Tube

Paper delivery unit

Hole

3.Action: From 1997 June production.

Arrow view A

3. Measure to prevent problems of double feeding.

1.Model Name: SF-A14/A15

2.General: There have been problems of double feeding during paper feeding operations of the

original documents. As a measure to alleviate this problem, a change has been carried
out in the material of the separator belt of the transport section.

3.Description: Material Polyurethane rubber → EPDM

Color Black → Gray

4.Action: From 1997 July production.

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