Ricoh A048 Technical Bulletin FT4418
Technical Bulletin
No.
RTB-001
SUBJECT: Dirty Background on Color Copies
PREPARED BY: .
CHECKED BY:
CLASSIFICATlON:
■ Action Required
❑ Troubleshooting
Phenomenon ]
[
Cause ]
[
Countermeasure ]
[
Itoh
.
❑ Revision of service manual
❑ Information only
Color copies have a dirty background
The screw [A] at the rear side of the color development unit does
not extend for enough to push in the color switch. Consequently,
black toner density control is selected and toner density becomes
high. This causes a dirty background.
If the problem occurs or when installing a color development unit,
install a spacer [B] as shown in the following illustration. This
spacer must be 2.0 to 2.5 mm thick and the outside diameter must
be less than 9.0 mm. Then, check whether the color indicator
properlv Iights when the color development unit is installed on the
rnachine.
-
DATE:
PAGE: 1 of
FROM: Copier Technical Support Group
MODEL: N220
.
Oct.
4, ’90
1
!
NOTE1: If a spacer thicker than 2.5 mm is
used, the screw on the
development unit may damage
the color switch.
NOTE2: A 2.0 mm width spacer will be
added as an accessory to the
For
color development unit.
cut-in serial number, please refer
to the modification bulletin that we
will be issuing soon.
the
NOTE:
If you have no spacer that meets
the above specifications, adjust
the position of the screw [A] as
follows:
While inserting a 2.0 mm thickness gauge between the screw
and part [C], tighten the screw
.
[A]
[c]
2,0
to 2.5
4.0 mm
Technical Bulletin
No.
RTB-002
SUBJECT: Service Manual Correction (Water Proof)
PREPARED
CHECKED BY:
CLASSIFICATlON:
❑ Action Required
❑ Troubleshooting
❑ Retrofit Information
There are some mistakes in the “TABLE
The illustrations for ADS and ID
Please correct your manual as shown below:
l---
■ Revision of service manual
❑ Information only
❑ Other
sensors adjustments are incorrect.
L.
OF
ADJUSTMENTS” section of the waterproof.
DATE:
PAGE: 1 of 1
FROM: Copier Technical Support Sec.
MODEL: N220
NOV. 30, ’90
Technical Bulletin
No. RTB-003
SUBJECT: C/G/B Power Pack Damage
PREPARED B
CHECKED B
CLASSIFICATI
❑ Action Req
Troubleshooting
❑ Retrofit Information
-—.
[ Phenomenon ]
[ Cause
[ Countermeasure
On the production
The clearance between the bias harness connector and the rear cover is increased by
changing the shape of the connector as shown below: This prevents the connector from
being pressed by the rear cover.
]
Dirty background may occur.
The bias connector on the C/G/B power pack may be pressed
against the power pack’s PCB by the rear cover. This damages
the PCB. As a result, incorrect bias voltage is applied to the
development roller and dirty background occurs.
]
line
❑ Revision of service manual
❑ Information only
❑ Other
FROM: Copier Technical Support Sec.
MODEL: N220
I
DATE:
PAGE: 1 of 3
NOV.
30, ‘90
New
This modification has been implemented on the production units from the October
mass-production run.
Technical Bulletin
No.
RTB-003
SUBJECT: C/G/B Power Pack Damage
In the field
New Type
Bias Connector
To prevent this from occurring, bend the bias terminal as
explained below to make clearance between the rear cover and
the bias terminal. Do this at installation or during the next
maintenance call.
[A]
DATE:
PAGE: 2 of 3
NOV. 30, ‘90
NOTE: It is not necessary to perform the following procedure on the machine that has a
new type bias connector.
1. Turn off the main switch and unplug the power supply cord.
2. Remove the rear cover (4 screws).
3. Disconnect the bias connector [A] from the C/G/B power pack [B].
4. Bend the bias terminal [C] until the terminal edge [D] is aligned with the line [E] on the
transformer [F] on the power pack while holding the base [G] of the terminal with a pair
of pliers.
NOTE: a. Be careful not to damage the soldered connection between the terminal and the
pattern on the PCB.
b. Do not to far bend the terminal. Otherwise, a poor connection between the
terminal and the connector will result.
5. Reconnect the bias connector and reinstall the rear cover.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
m
Technical Bulletin
SUBJECT: C/G/B Power Pack Damage
New Type
Bias Connector
No.
RTB-003
DATE:
PAGE: 3 of 3
NOV. 30, ’90
NOTE: Some of the May ’90 production machines have the louver plates on the rear
cover as shown in the illustration.
These louver plates have been removed from the rear cover with the modification.
The cut-in serial number was not checked since this modification had an
interchangeability.
If the louver plates are installed on the rear cover, the left upper-side louver plate
[A] contacts the bias connector (new type) when the rear cover is installed. This
may damage the C/G/B power pack.
left
The
new type bias connector (as shown above) and the rear cover having the louver
plates.
upper-side louver plate must be removed on the machines that have the
Technical Bulletin No. RTB-004
SUBJECT: The reason why Vsp remains above 0.5 volts DATE: Dec. 31, ’90
PAGE: 1 of 2
PREPARED BY: T. Itoh
CHECKED BY:
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
The conditions under which Vsp remains above 0.5 volts are as follows:
The amount of toner supplied to the development unit depends on the ratio of Vsg and
Vsp. (Please refer to the following table for the toner supply levels.)
ID Sensor Data
Vsp/Vsg x 100
(Vsp, if Vsg = 4.0 volts)
0 to 12.5%
(0 to 0.5 volts)
12.5 to 15.0%
(0.5 to 0.6 volts)
15.0 to 17.5%
(0.6 to 0.7 volts)
17.5 to 25.0%
(0.7 to 1.0 volts)
25.0 to 62.5%
(1.0 to 2.5 volts)
(See NOTE below.)
62.5 % to 100% or higher
(2.5 to 5.0 volts)
Revision of service manual
Information only
Other
Toner Supply Level
(Toner Supply Ratio, if SP
#31 = 0)
No toner supply
(0%)
1
(3.75%)
2
(7.5%)
3
(15%)
4
(30%)
Fixed Supply Mode N/A
FROM: Copier Technical Support Sec.
MODEL:
N220
ID Sensor Data
0
15
29
59
118
NOTE:
If this condition is detected two times consecutively, the toner supply ratio rises to 60% (ID
Sensor Data = 236), which is double that at toner supply level 4.
The N220 is designed to vary toner supply according to the type of original and to
continuously supply toner to the development unit as long as the total image area on the
original is 3.75% or higher. Continuous toner supply minimizes variation in the toner
density in the development unit.
Technical Bulletin No. RTB-004
SUBJECT: The reason why Vsp remains above 0.5 volts DATE:
PAGE: 2 of 2
Example 1:
If SP mode #31 is set to 0 and Vsp is greater than 0.5 volts but less than 0.6 volts, the
main CPU sets the toner supply level to 3.75%. The toner supply level is set to 3.75% and
toner is supplied at every copy cycle when the total image area on the original is greater
than 3.75 % and less than 7.5%.
Example 2:
When copies are made of the OS-A3 chart (24% total image area), the Vsp remains at
slightly higher than 1.0 volt. The toner supply ratio changes to 30% and toner is supplied
at every copy cycle as shown in the above table.
Therefore, Vsp does not drop below 0.5 volts as long as originals have at least 3.75% total
image area.
Technical Bulletin No. RTB-005
SUBJECT: Scanner movement DATE: Dec. 31, ’90
PAGE: 1 of 2
PREPARED BY: T. Itoh
CHECKED BY:
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
[ Phenomenon ]
When the Start key is pressed, the scanner does not start smoothly from the home
position, causing vibration noise.
[ Cause ]
Two sponge spacers [A] are located in the scanner motor assembly as shown in the
illustration. The sponge spacers may interfere with the rotation of the scanner drive gear
[B].
[ Countermeasure ]
Revision of service manual
Information only
Other
FROM: Copier Technical Support Sec.
MODEL:
N220
Remove one of the sponge spacers from the scanner motor assembly. (It does not matter
which spacer is removed.)
[B]
[A]
NOTE:
To prevent the scanner wires
come off the pulley when removing the sponge spacer, set the
omega clamp on the pully. Then,
remove the pulley and place it on
the bracket as shown.
Technical Bulletin No. RTB-005
SUBJECT: Scanner movement DATE: Dec. 31, ’90
PAGE: 2 of 2
Removal of the sponge spacer is being done on the production line. The machines which
have two sponge spacers are as follows:
Model Code
A048-15 July production units - September production
units
A048-16 & 25 ---A048-17 July production units - 2590100478
A048-19 July production units - September production
units
A048-26 July production units - September production
units
A048-27 July production units - October production units
A048-28 ---A048-29 July production units - October production units
Technical Bulletin No. RTB-006
SUBJECT: Service Manual Correction DATE: Feb. 15, ’91
PAGE: 1 of 9
PREPARED BY: T. Itoh
CHECKED BY:
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
Some mistakes were found in the manual. Please correct your manual as follows:
1. Page 1-2
Incorrect Correct
Power Source:
110V/60Hz/15A
115V/60Hz/15A
220V/50Hz/ 8A
220V/60Hz/ 8A
240V/50Hz/ 8A
(The correction is bolded.)
Revision of service manual
Information only
Other
FROM: Copier Technical Support Sec.
MODEL: N220
Power Source:
110V/60Hz/15A (for Taiwan)
115V/60Hz/15A (for N.A.)
220V/50Hz/ 8A (for EU.)
220V/60Hz/ 8A (for EU.)
240V/50Hz/ 8A (for EU.)
2. Page 1-3
Incorrect Correct
Section A: See page 7.
Section B: See page 8.
Section C: See page 10.
3. Page 2-23
Incorrect Correct
SE: Side erase margin
2.0 ± 1.0 mm on each side;
4. Page 2-24
Remove the following contents from the manual:
"The side erase margin overlaps the edges of the paper to prevent edge lines from
appearing on the copy."
(The correction is bolded.)
Section A: See page 1-4.
Section B: See page 1-5 or 1-6.
Section C: See page 1-7 or 1-8.
(The correction is bolded.)
SE: Side erase margin
2.0 ± 2.0 mm on each side;
Technical Bulletin No. RTB-006
SUBJECT: Service Manual Correction DATE: Feb. 15, ’91
PAGE: 2 of 9
5. Page 2-25
(Incorrect)
Blocks On Paper Size Reproduction Ratio (%)
None
a
a - b
a - c
a - d
a - e
a - f
a - f, g
All
(Correct)
Blocks On Paper Size Reproduction Ratio (%)
None
a
a - b
a - c
a - d
a - e
a - f
a - f, g
All
A3, A4 side ways
11"x17", 11"x8 1/2
B4
8 1/2"x11", 8 1/2"x5 1/2"
A4 lengthwise
B5 lengthwise
A5 lengthwise, 5 1/2"x8 1/2"
A3, A4 side ways
11"x17", 11"x8 1/2
B4
8 1/2"x11", 8 1/2"x5 1/2"
A4 lengthwise
B5 lengthwise
A5 lengthwise, 5 1/2"x8 1/2"
99 - 200
96 - 98
86 - 95
For ID sensor pattern
For Vr Correction
98 - 200
92 - 97
86 - 91
80 - 85
71 - 79
61- 70
50 - 60
For ID sensor pattern
For Vr Correction
6. Page 2-43
(Incorrect)
ID Sensor Data
Vsp/Vsg x 100
(Vsp, if Vsg = 4.0 volts)
0 to 12.5%
(0 to 0.5 volts)
12.5 to 15.0%
(0.5 to 0.6 volts)
15.0 to 17.5%
(0.6 to 0.7 volts)
17.5 to 62.5%
(0.7 to 1.0 volts)
62.5 % to 100% or higher
(2.5 to 5.0 volts)
Toner Supply Level
(Toner Supply Ratio, if SP #31
= 0)
No toner supply 0
1 15
2 29
3 59
Fixed Supply Mode N/A
ID Sensor Data
Technical Bulletin No. RTB-006
SUBJECT: Service Manual Correction DATE: Feb. 15, ’91
PAGE: 3 of 9
(Correct)
ID Sensor Data
Vsp/Vsg x 100
(Vsp, if Vsg = 4.0 volts)
0 to 12.5%
(0 to 0.5 volts)
12.5 to 15.0%
(0.5 to 0.6 volts)
15.0 to 17.5%
(0.6 to 0.7 volts)
17.5 to 25.0%
(0.7 to 1.0 volts)
25.0 to 62.5%
(1.0 to 2.5 volts)
(See NOTE below.)
62.5 % to 100% or higher
(2.5 to 5.0 volts)
Toner Supply Level
(Toner Supply Ratio, if SP #31
= 0)
No toner supply
(0%)
1
(3.75%)
2
(7.5%)
3
(15%)
4
(30%)
Fixed Supply Mode N/A
ID Sensor Data
0
15
29
59
118
NOTE: If this condition is detected two times consecutively, the toner supply ratio
rises to 60% (ID Sensor Data = 236), which is double that at toner supply
level 4.
7. Page 2-63
(Incorrect)
(The correction is bolded.)
Paper Size Switch Size Indication
4 5 6 7
11" x 8 1/2" 1 1 1 0 11" x 8 1/2"
(Correct)
Paper Size Switch Size Indication
4 5 6 7
11" x 8 1/2" 1 1 1 0 8 1/2" x 11"
8. Page 2-65
(The correction is bolded.)
Incorrect Correct
The second feed clutch is energized for
150 milliseconds to transfer drive to the
2nd feed roller shaft and turns the 2nd
feed rollers [H].
The second feed clutch is energized for
500 milliseconds to transfer drive to the
2nd feed roller shaft and turns the 2nd
feed rollers [H].
Technical Bulletin No. RTB-006
SUBJECT: Service Manual Correction DATE: Feb. 15, ’91
PAGE: 4 of 9
9. Page 2-69
Incorrect Correct
Relay Roller Clutch
150 m sec 150 m sec150 m sec
10. Page 3-3
Incorrect Correct
1. Input Voltage Level:
110V/60Hz/15A:More Than 15A
115V/60Hz/15A:More Than 15A
220V/50Hz/ 8A:More Than 8A
220V/60Hz/ 8A:More Than 8A
240V/50Hz/ 8A:More Than 8A
Relay Roller Clutch
500 m sec 500 m sec500 m sec
(The correction is bolded.)
1. Input Voltage Level:
110V/60Hz/15A:More Than 15A
(for Taiwan)
115V/60Hz/15A:More Than 15A
(for N.A.)
220V/50Hz/ 8A:More Than 8A (for EU.)
220V/60Hz/ 8A:More Than 8A (for EU.)
240V/50Hz/ 8A:More Than 8A (for EU.)
Remove the following contents from the manual:
3. Permissible extension cord : At least 300V, 30A capacity and less than 5 meters
(16.4 ft) long.
11. Page 4-3
Incorrect Correct
When the DF is used with this copier,
DIP switch 101-4 must be turned off to
increase the data transmission speed.
12. Page 4-9
Incorrect Correct
3. Select Service program SP-97 and
press the "1" key on the key pad,
then press the Enter key.
(The correction is bolded.)
When the DF is used with this copier,
DIP switch 101-2 must be turned off to
increase the data transmission speed.
(The correction is bolded.)
3. Select Service program SP-98 and
press the "1" key on the key pad,
then press the Enter key.
Technical Bulletin
No.
RTB-006
SUBJECT: Service Manual Correction
13. Page 4-10
Incorrect
SP Modes #5, #6, #11, #37, #42,
#43, #44, #47, #48, #52, #55
#59
14. Page 4-12
Incorrect
The factory setting of SP
in the Service Program Mode Table.
15. Page 4-16
Incorrect
Mode No.
Bias Voltage
*59
Check (Black)
(The correction is
and
j
(The correction is
mode 21 is
(The correction is
“0”
DATE: Feb. 15, ’91
PAGE: 5 of 9
bolded.)
Correct
SP Modes #5, #6, #8, #37,
#42, #43,
#44, #47, #48, #52, #55, and #59
bolded.)
Correct
The factory setting of SP mode 21 is “1”
in the Service Program Mode Table.
bolded.)
Correct
Mode No.
*59
Bias Voltage
Check
16. Page 4-18
Incorrect
The factory setting of SP mode
in the Service Program Mode Table.
17. Page 4-23
Incorrect
(
Output No. 2
(
Charge Corona + Standard Grid
[
Output No. 3
(
Charge Corona + ID Sensor Grid
(
Output No. 4
(
Charge Corona + Vrp Grid
(The correction is bolded.)
(The correction is
76 is “0”
Correct
The factory setting of SP mode 76 is “1”
in the Service Program Mode Table.
bolded.)
Correct
Output No. 2
Charge Corona + Standard Grid
(Grid Voltage = -920 volts)
Output No. 3
Charge Corona + ID Sensor Grid
(Grid Voltage =
-660 volts + Vp
Correction Factor)
Output No. 4
Charge Corona + Vrp Grid
(Grid Voltage = -500 volts)
Technical Bulletin No. RTB-006
SUBJECT: Service Manual Correction DATE: Feb. 15, ’91
PAGE: 6 of 9
18 Page 4-24
Incorrect Correct
Out Put No. 60 - 67
Applies grid voltage in 60V steps
starting at 640V
19. Page 4-32
Incorrect Correct
a) ADS Voltage (SP NO. 56)
......2.5 + 0.1V
b) Vsg (SP No. 54)
.....4.0 + 0.2V
20. Page 4-35
Incorrect Correct
2. If the RAM on the main board is still
usable, remove it and place it on the
new main board. Then, install the
new main board.
3. After placing a new RAM on the new
main board, clear the RAM memory
using SP mode #99 (Do not clear
RAM memory if you have placed the
old RAM on the new main board.)
Then check and adjust the data of
the following SP modes:
(The correction is bolded.)
(The correction is bolded.)
Out Put No. 60 - 67
Applies grid voltage in 60V steps
starting at 560V
a) ADS Voltage (SP NO. 56)
......2.5 ± 0.1V
b) Vsg (SP No. 54)
.....4.0 ± 0.2V
2. If the RAM on the main board is still
usable, remove and place it on the
new main board. Then, install the
new main board to the copier.
3. After installing the new main board
with the new RAM, clear the RAM
memory using SP mode #99 (Do not
clear RAM memory if you have
placed the old RAM on the new main
board.) Then check and adjust the
data of the following SP modes:
Technical Bulletin No. RTB-006
SUBJECT: Service Manual Correction DATE: Feb. 15, ’91
PAGE: 7 of 9
21. Page 4-37
Incorrect Correct
SP Mode
Numbers
22. Page 5-15
3. Put the bead of the silver wire [2] ion
slot [B] on the Allen screw side.
23. Page 5-28
1. Take out the development roller. 1. Take out the development unit.
12, 20-35, 41-44, 47,
48, 54, 56, 70, 71, 74
Incorrect Correct
Incorrect Correct
(The correction is bolded.)
SP Mode
Numbers
(The correction is bolded.)
3. Put the bead of the silver wire [2] in
slot [B] on the Allen screw side.
(The correction is bolded.)
12, 30-35, 41-44, 47,
48, 54, 56, 70, 71, 74
24. Page 5-67
Incorrect Correct
1. Make the gap between the edge of
the bracket [B] and the entrance
guide plate 3.0 mm as shown in the
illustration. Then, tighten both the
front rear screws.
ADJUSTMENT STANDARD:
GAP "X" Front 2.65 ± 0.1 mm
Rear 3.25 ± 0.1 mm
1. Set the Gap "X" between the edge of
the bracket [B] and the entrance
guide plate adjustment standard
using the thickness gauge as shown
in the illustration. Then, tighten both
the front rear screws.
Technical Bulletin No. RTB-006
SUBJECT: Service Manual Correction DATE: Feb. 15, ’91
PAGE: 8 of 9
25. Page 5-73
Incorrect Correct
6. Remove the drum knob [A] and the
bearing [B] from the drum, then
install them on the drum shaft [C]
(special tool : P/N #A0069500).
26. Page 6-43
Incorrect Correct
- Possible Causes -
• Thermistor Open
27. Page 8-6
Incorrect Correct
When the Start key is pressed, the
copier CPU moves the scanner 100
mm away from the left scale and
sends the feed-in signal to the DF.
(The correction is bolded.)
(The correction is bolded.)
(The correction is bolded.)
6. Remove the drum knob [A] and the
bearing [B] from the drum, then
install them on the drum shaft [C]
(special tool : P/N #A0069105).
- Possible Causes -
• Thermofuse Open
When the Start key is pressed, the
copier CPU sends the feed-in signal to
the DF.
28. Page 8-11
The illustration on this page is incorrect. The correct illustration is as follows:
Technical Bulletin No. RTB-006
SUBJECT: Service Manual Correction DATE: Feb. 15, ’91
PAGE: 9 of 9
28. Page 8-31
The illustration on this page is incorrect. The correct illustration is as follows:
Technical Bulletin No. RTB-007
SUBJECT: Warning Description DATE: Mar. 31, ’91
PAGE: 1 of 1
PREPARED BY: T. Itoh
CHECKED BY:
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
The following warning description is missing from the service manual. The warning
description must be described in the service manual for Safety Standard.
Please add the following warning description to your service manual (Service Remarks
Section).
WARNING: The RAM board has a lithium battery which can explode if handled
incorrectly, replace only with same RAM board. Do not recharge, disassemble or burn
this battery. Used RAM boards must be handled in accordance with local regulations.
Revision of service manual
Information only
Other
FROM: Copier Technical Support Sec.
MODEL: N220
Technical Bulletin No. RTB-008
SUBJECT: SP Modes #45 and #46 (Paper Buckle Adjustment) DATE: Mar. 31, ’91
PAGE: 1 of 3
PREPARED BY: T. Itoh
CHECKED BY:
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
The new SP modes (#45 and #46) have been applied to the main ROM (See last page for
cut-in serial numbers.)
SP modes #45 and #46 are to adjust the amount of the paper buckle in the registration
area. The amount of paper buckle can be adjusted by changing OFF timing of the 1st
paper feed clutch or relay roller clutch solenoid.
SP mode #45 is for the 1st feed station and SP mode #46 is for the 2nd feed station.
(Refer to the Table on next page.)
• The reasons for applying these SP modes are as follows:
1. To get the proper amount of paper buckle for various paper, these SP modes were
applied.
2. When the copy is made using thin paper from the 2nd feed station, noise may occur
due to double buckling. This is caused by the buckled paper hitting the turn guide
plate as shown in the illustrations
Revision of service manual
Information only
Other
FROM: Copier Technical Support Sec.
MODEL:
N220
Registration
Rollers
Turn Guide
Plate
Normal Paper Path
Paper
When the paper hits to the turn
guide plate, noise occurs.
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