Toshiba f97k079 Service Note

BSI(Service Note) TOSHIBA

TOSHIBA TEC CORPORATION

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

BSI No

F97K079

SUBJECT

Countermeasure to Drive Unit Deformation

MODEL

CATEGORY

Countermeasure to field
trouble, Treatment in the field

1550: From Oct. 1997
1560: From Nov. 1997
[Temporary countermeasure
parts have been applied to
October machines (1st Lot.)

CONTENT

[Phenomenon]
Abnormal noises from the driving unit and incorrect developer may be caused by the rubbing of the
developer driving gear (P4/Item 16) within the drive unit and the toothed edge of the developer unit
gear (P18/Item 5).

1550, 1560

FIELD APPLICATION

To be applied when necessary

FACTORY APPLICATION

Date

97/11/26

UNIT

Drive Section

DTM-F7808/7X03

[Cause]
The drive unit has been deformed in the rear direction because of shock occasioned during the
installation of the process unit. The developer driving gear within the drive unit and the engagement
of the developer gear do not synchronize and the toothed edge is rubbed.

[Countermeasure]
To prevent drive unit deformation, the shaft length in the drive unit (P4 Item 13/developer drive gear
insertion side) has been extended and made to contact against the rear frame.
In order to prevent vibration noise in the aligning area, a rubber sheet has been added to be attached
to the rear frame.

Shaft

Shaft length extension

Rubber

(aligned to the rear frame)

Drive unit frame

Shaft unit
driving side

[Drive unit/P4]

(Position for attaching the rubber sheet to prevent vibration noise.)

BSI No. F97K079 Page 2

Rear frame

Rubber sheet
added

Drive unit
sub-frame

To be aligned to bent
portion of the rear frame.

Aligned to the screw

(Rear frame within the copier viewed from the front side)

(Changed/Added Part No.)

Part Name Page-Item Current New Remarks Interchangeability
Shaft
(developer unit
driving side)

4-13
4-42

4400664160
STUD-DRIVE-D/D

4400664080
STUD-DRIVE-DEV

Refer to the
note below.

B

Rubber sheet 5-43 --- 4400664090

CUS-STD-DEV

Note: Though the current shaft is also used for drum driving, the drum driving shaft has not been

changed.

[Measure in the field]
In copiers to which the above countermeasure has been applied, the gears rubbed by the toothed
edge should be replaced. The countermeasure part for the field only (spacer) should be also applied
as shown below.

Spacer installing procedure

1. Open the front cover and the upper unit. Then remove the paper-feed bypass cover.