Toshiba f97i021 Service Note

BSI(Service Note) TOSHIBA

TOSHIBA TEC CORPORATION

2-4-1, Shibakoen, Minato-ku, TOKYO, 105-8524 JAPAN

BSI No

F97I021

SUBJECT

Change of ROM (Main ROM Ver. 20 to 22, LCD ROM Ver. 200 to 220)

MODEL

CATEGORY

Other countermeasures,
Treatment in the field, To
improve the operability

From Aug. 1997/MH712884

CONTENT

The following items have been changed.
(Note: Each languages ROM )

Items

6560

FIELD APPLICATION

To be applied when necessary

FACTORY APPLICATION

The ROM (LCD ROM) for each languages will be altered later. The MAIN ROM will not be
altered. If only the MAIN ROM is altered, then operating errors could very well occur. (Refer to
"Combination of ROM Versions")

Contents Remarks

1 When inputing the new value to change the edge-erase width or

image-shift copy width, the new value canl be set without pressing
the SET key.
When the machine is set up for the use of access codes, after

2

copying, pressing the ALL CLEAR key twice should return it to code
stand by status. However, sometimes this does not happen, and this
is to be corrected.
Adjustment code for countermeasure to insufficient transfer

3

Setting value (setting range) of "08 mode/code 64 is expanded
(current: 0, 1 --> New: 0~8)

Date

UNIT

Software

97/10/15

DTM-F7803

For details, see
below

[ Details of insufficient transfer countermeasure code ]

1. Control contents of each setting value
Each output of transfer, separation DC, and pre-transfer discharging (PTC) for single-side/duplex
copying has been changed as shown in Table 1.

Table 1 08 mode/Code 64 control of setting values

Single-side
copying

Setting

value

code 64

0 100% 100% 0% 100% 93% 100% -->0% Current
1 100% 100% 100% 100% 93% 100%
2 100% 100% 0% 100% 93% 0%
3 100% 100% 50% -->0% 100% 93% 100% -->0% Newly
4 100% 100% 100% -->0% 100% 93% 100% -->0% added
5 85% 100% 125% 85% 100% 125%

Transfer

output

Separation

DC output

PTC output Transfer

output

Duplex

coping

Separation

DC output

PTC output Remarks

BSI No. F97I021 Page 2

6 85% 92% 125% 85% 92% 125%
7 85% 83% 125% 85% 83% 125%

8 85% 76% 125% 85% 76% 125%
*1 Setting value of Code 64 at the time of shipping: 0
*2 100% at PTC output -->0%: Leading edge of paper until 40 mm : 100%, after this 0%
*3 50% at TC output --> 0%: Leading edge of paper until 40 mm : 50%, after this 0 %

2. Countermeasure to insufficient transfer

Though the insufficient transfer problem is improved by allowing PTC output (pre-transfer
discharging), there is still some image deterioration. Then, the setting value at the time of
shipping of code 64 is "0", so single-side copying does not experience insufficient transfer even
without PTC output. Only duplex copying requires a PTC output as insufficient transfer easily
arises.

(1) Insufficient transfer in single-side copying

Increasing the numerical value "0-->3-->4-->1-->5--> 6-->7-->8", Code 64 is effective in
correcting this problem.
When an insufficient transfer appear on the leading edge of the copy, it is prevented by
setting value "3,4".
When insufficient transfer appears on the whole surface of the copy, it can be prevented by
setting values "1, 5, 6, 7, 8".
Especially, the effect on thin papers can be altered by setting value "5, 6, 7, 8".
However, as the separation DC output is down in accordance with change of the setting
value to "5 -->6 -->7 -->8 ", there is a possibility that separation claw mark (leading edge of
image) may be left or jams may occur .

(2) Insufficient transfer in duplex copying

Increasing the numerical value "0(=3,4) -->1 -->5 -->6 -->7 -->8", Code 64 is effective in
correcting this problem.
When an insufficient transfer appears, try each setting value "1, 5, 6, 7, 8".
However, as the separation DC output is down in accordance with the change of the setting
value to "5 -->6 --> 7 -->8 ", there is a possibility that separation claw mark (leading edge of
image) may be left or jams may occur .

3. Notes

When the setting value of code 64 is changed at the time of shipping to value "0", the following
settings have to be adjusted at the time of shipping before the change. (See below.)

Transfer: DC-78 ~ -88mV
Separation: AC133~151mV (True value)

AC127 ~ 144mV (Average value)
Separation DC Setting value of mode 05/code 44 is "185"
PTC: DC40~56mV

(pre-transfer discharging)

In the 6560, if the setting value of code 64 is changed, there is no change in the charger output
so there is need to adjust the exposure.

[ Combinations of ROM Versions ]

When the change of the ROM version is performed in the field, the MAIN, LCD and PNL ROMs
should also be changed to the newest versions at the same time (see below). If combinations other
than these are used, then operating errors could very well occur.

MAIN: Ver. 22
LCD: Ver. 220