SHARP SP1947 Technical Report

Date: Oct. 23, 1995

COPIER : SF-2116

No. : SP-1947

THE ADDITION OF A NEW SIMULATION (44-12)

1.Model Name: SF-2116/ 21 18/1016/1018

2.General: We are adding a new simulation, simulation 44-12, for use in troubleshooting when F2

trouble (automatic image quality correction) occurs with the main PWB ROM, version

2.5 (or higher). The following contains details on F2 trouble and the use of simulation 44-12. Please refer to it when F2 t r ouble occurs. ROM version 2.5 is installed in units produced from July 1995 on.

Concerning F2 (ProCon trouble) (Addendum)

Note: This addendum is effective for ROM versions 2.5 and up.

1. There are 5 subcodes when F2 trouble occurs. In order to clarify the source of the problem, and provide for additional explanation as necessary, a number of subcodes have been added.

A) F2-31 Trouble with the ProCon sensor B) F2-32 Trouble related to the drum m ar k C) F2-33 Trouble with the ProCon correction value remit. D) F2-35 Trouble with the ProCon patch E) F2-37 Trouble with the drum mark sensor gain adjustment

Among the problems listed above are problems which will not occur while copying. (See “F2 trouble with versions 2.5 and up.”) For such cases, check the value produced by simulation 44-9-E.

SHARP CORPORATION Reprography Division

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2. The conditions and causes of the various types of F2 trouble are detailed below.

a) F2-31 Cause … ➀ Automatic adjustment of the drum foundation level is being attempted,

but the density sensed does not fit into the 3.75-4.5 V range even at the highest or lowest emission level setting. ➁ The foundation level during ProCon operations is less than 2.8 V.

Possible causes include: .

Main PWB malfunctioning (PCG, ProCon line)

Problems with the harness connection

Density sensor PWB malfunctioning (ProCon sensor)

Blank lamp PWB malfunctioning (the blank lamp doesn’t light)

Improper cleaning (the drum is coated with toner)

Dirt on the density sensor (when the toner has leaked)

∗ If the reason for the trouble is as outlined in 2, F2 will not be displayed during copying.

F2 will only be displayed during copying if the simulation is being used. (If you use simulation 44-9-E while copying, or after copying, 31 will be displayed.)

Repair: I. Carry out simulation 44-7 (density sensor, drum mark sensor test).

If the values for A through E are all 0 or 99, check that the main PWB, harness connector, and densit

sensor PWB are functioning normally.

If the values for A through E are all under 74, it is likely that the densit

sensor (ProCon) is dirty.

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II. Use simulation 5-5 to check the blank lamp is functioning properly.

If all is normal, at the end, both ends of the blank lamp will be on. If all is not normal, check the blank lamp PWB and the harness connection.

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III. Using simulation 44-6, force the ProCon to run until the F2-31 trouble occurs again.

When F2-31 trouble occurs again, immediately check the condition of the drum. If the

drum is coated with a large amount of toner, the cleaning process is insufficient.

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b) F2-32 Cause… ➀ After automatic adjustment of the drum foundation level

(Drum mark sensor gain adjustment) is carried out, the main PWB input label does not display “high” until the drum has completed 1.25 rotations. → There is a problem detecting the drum mark. ➁ When the drum mark label is too dark. (When the drum mark sector light sensor/drum foundation face level light sensor shows 0.35 / 1 or lower.)

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