Ricoh A075 Technical Bulletin FT4415
Technical Bulletin No. RTB-001
SUBJECT: Paper lift and sector gear slipping DATE: Sep. 15, ’91
PAGE: 1 of 1
PREPARED BY: T. Itoh
CHECKED BY:
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
[ Phenomenon ] When the paper stack in the cassette is lifted up, the paper lift
gear [A] and the sector gear [B] slip.
[ Cause ] The mesh between the paper lift gear and the sector gear is too
shallow.
[ Action ]
[A]
Revision of service manual
Information only
Other
Push
TO: Copier Technical Support Section
MODEL: N210
No Gap
1. Turn off the main switch.
2. Make sure that the cassette is installed on the copier and the manual feed table is
closed.
3. Remove the rear cover and the main board.
4. Loosen the screw [C].
5. Retighten the screw while pushing down the paper lift clutch support bracket [D] so
that there is no gap between the pitch circles of the paper lift gear and the sector gear.
6. Reassemble all parts previously removed.
NOTE: When the paper lift clutch support bracket is removed during servicing, the
bracket must be reinstalled according to the above procedure.
[B]
[D]
[C]
Technical Bulletin
No.
RTB-002
SUBJECT: New procedure for the DG (doctor gap) adjustment
PREPARED BY:
CHECKED BY:
CLASSIFIC
FROM: Copier Technical Support Section
MODEL: N210
DATE: Jan. 31, ’92
PAGE: 1 of 4
■ Revision of service manual
❑ Information only
❑ Retrofit Information ❑ Other
This procedure supersedes the doctor gap adjustment procedure in the service manual.
NEW PROCEDURE:
CAUTION: The doctor gap was adjusted at the factory using the special
tool. Therefore, normally this adjustment is not required in the field.
Only when the development unit is disassembled or the development
roller is replaced, this adjustment is required.
1. Confirmation Procedure
[
1. Take out the development unit.
2. Remove the developer.
3. Remove the inlet seal plate [A] by working a small blade screwdriver along the edge of
the plate while pressing the stoppers [B] with one finger as shown.
CAUTION: Be careful not to damage the stoppers [B] when removing the inlet seal
plate.
4. Clean the development roller [C] with a vacuum cleaner until no developer is left on
it
the roller. Turn the roller to make sure that
NOTE: This prevents surface damage to the roller and ensures an accurate adjustment.
is free of developer.
Technical Bulletin
No.
RTB-002
SUBJECT: New procedure for the DG (doctor gap) adjustment
20 mm
DATE: Jan. 31, ’92
PAGE: 2 of 4
Position the DG gauge (P/N #A0489507) 20 mm (0.8 inch) from the front end of the
5.
development roller, and insert the gauge into the doctor gap until it stops.
‘
CAUTION: Do not force the DG gauge into the gap and do not press the gauge too
hard on the roller. The roller should not rotate when you insert the
gauge into the gap.
I
Technical Bulletin
No.
RTB-002
SUBJECT: New procedure for the DG (doctor gap) adjustment
6. Check the doctor gap at four points
turning the development roller 90° each
time.
If the “GO” part of the DG gauge goes
through the doctor gap, and the “NO GO”
part does not go through, the gap at this
s
point is: 0.63 mm
If the “GO” part of the DG gauge does not
go through the doctor gap, the gap at this
point is:
c
0.63 mm
DG
If both “GO” part and “NO GO” part go
through the doctor gap, the gap at this
point is: DG
>0.72
DG s 0.72 mm
mm
DATE: Jan. 31, ’91
PAGE: 3 of 4
Good
Too narrow
Too wide
7. Repeat steps 6 and 7 for the rear side of the development roller.
s
8. If either 3 out of 4 checked points or all 4 points are “0.63 mm
gap is in good condition. If more than 2 out of 4 checked points are “DG
adjust the DG. If more than 2 out of 4 checked points are “DG
DG only when there is any of the following problems:
a. Severe jitter copy
b. Blocking of development drive mechanism
c. Developer leakage
DG s 0.72 mm”, the
> 0.72 mm” adjust the
e
0.63 mm”,
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