Ricoh A183 Service manual

Technical Bulletin No. RTB-001
SUBJECT: NIP BAND WIDTH AND TRAILING EDGE SKEW
ADJUSTMENT DATE: Oct. 31, ’96 PAGE: 1 of 2
PREPARED BY: M. Ishihara
CHECKED BY: FROM: 1st Field Information Dept. QAC
CLASSIFICATION:
Action Required
Troubleshooting
Retrofit Information
Revision of service manual
Information only
Other
MODEL:
Skylark (A183/A184)
1. Nip Band Width Adjustment
The nip band width of this model is decided by the height of each screw on both fusing
unit pressure arms.
Adjust the height of the screw on each pressure arm as follows:
Item Parts No. Specification
Right Pressure Arm A1844085 8 ±0.2
Left Pressure Arm A1844086 7.5 ±0.2
❋Note that the adjustment specification differs between the two pressure arms.

Technical Bulletin No. RTB-001
SUBJECT: NIP BAND WIDTH AND TRAILING EDGE SKEW
ADJUSTMENT DATE: Oct. 31 ’96 PAGE: 2 of 2
2. Trailing Edge Skew Adjustment Procedure
Perform the following procedure in the field to decrease the amount of trailing edge skew:
1) Measure the height of the screw on both fusing unit pressure arms. (The factory
standard specification is described on the previous page.)
2) Change the screw height, making sure of the following:
NOTE: •The skew will be reduced 0.1 mm by turning the screw once.
•The height of the screw will change 0.7 mm by turning once.
•Do not turn the screw more than 3 turns.
✩If the skew on the copy paper is to the right, turn the left pressure arm screw
clockwise.
✩If the skew on the copy paper is to the left, turn the right pressure arm screw
clockwise.

RICOH TechnicalBulletin PAGE:1/1
Model: Skylark Date: 31-Mar-97 No: 2
Subject: SC Code #96 Prepared by: M.Ishihara
From: QAC 1st Field Information Dept. Checked by:T. Inoue
Classification: Troubleshooting
Mechanical
Paper path
Part information
Electrical
Transmit/receive
Action required
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Other ( )
The following should be added to the “SERVICE CALL CONDITIONS” in the Service
Manual.
CODE #96 - MAIN SWITCH ERROR
Definition
The machine does not turn off within 8.5 seconds after Auto Shut Off is performed.
Possible Causes
• Defective main switch.
• Connectors of the main switch are not correctly connected.
• Defective dc harness of the main switch connection (some lines must be cut.)
∗Remedy for the initially produced machines
• Turn the main switch off and on.

RICOH TechnicalBulletin PAGE:1/1
Model: Skylark Date: 15-Apr-97 No: 3
Subject: Additional Procedures for Operation Panel change Prepared by: M.Ishihara
From: QAC 1st Field Information Dept. Checked by:T. Inoue
Classification: Troubleshooting
Mechanical
Paper path
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Electrical
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SYMPTOM :Wrong indication on the Operation Panel
CAUSE :Bad connection of the 11P and 6P connectors
SOLUTION:
To confirm whether the two connectors are connected properly or not, the following steps
are required when there is an operation panel change from the horizontal position to the
vertical position or vice versa.
1) After connecting the 4 connectors (1.11P:from the main harness to the relay harness,
2.11P: from the relay harness to the operation panel, 3. 6P: from the main harness to
the relay harness, 4. 6P: from the relay harness to the operation panel), confirm that
the connectors are securely connected.
2) Confirm that all indicators can be lit using SP mode No. 11. (This turns on all
indicators on the operation panel for 30 seconds. It will turn off automatically after 30
seconds. To turn off the indicators immediately, press the lighter key.) The red and
green parts of the copy start indicator turn on together. So the color must be mixed.
3) Turn the main switch off and on.
4) Check all key functions by pressing all keys.

RICOH TechnicalBulletin PAGE:1/3
Model: Skylark Date: 15-Apr-97 No: 4
Subject: ADS Adjustment Procedure Prepared by: M. Ishihara
From: QAC 1st Field Information Dept. Checked by:T. Inoue
Classification: Troubleshooting
Mechanical
Paper path
Part information
Electrical
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Please correct your Service Manual as follows:
Page 6-41
*: Changed or Newly Added parts
7.6 ADS Adjustment
When: 1. After light intensity is changed
2. Image density in ADS mode is too light or too dark
Purpose: To maintain correct ADS mode operation.
Adjustment
Standard: ADS Voltage = 2.5 +-0.2V
Method: SP56 and VR100 on the main board
How it works: The bias voltage thresholds which correspond to image density will all change.
1. Place 5 sheets of A4 paper on the exposure glass.
2. Access SP56. The ADS sensor output is displayed.
*3. Adjust to 2.5+-0.2 V by turning VR100 on the main board.
*NOTE:
1) SP56 should not be used for observing the output value. The standard setting
inside the EEPROM is overwritten when this SP mode is accessed.
2) The machines from the factory may not always be within 2.5+-0.2 V. This is not a
problem. When adjusting in the field, adjust it to the value described above.
- Reasons for correction -
1. Note 1 has been added to make sure that SP56 (ADS Adjustment) is used to memorize
the adjustment standard value, not for checking the output value.
2. VR101 should always be adjusted after opening SP56, to adjust the voltage to the
standard value.
3. To perform SP56, the Start key does not have to be pressed.

RICOH TechnicalBulletin PAGE:2/3
Model: Skylark Date: 15-Apr-97 No: 4
Page 7-3
1.2 DIRTY BACKGROUND
“Possible Causes”should be corrected as follows. Item No. 5 has been eliminated
since this copier does not use a fiber optics cable for the ADS sensor.
-Possible Causes-
1. Dirty optics
2. Toner scattering
• High toner density
• The inlet seal of the development unit is stripped off.
• User/SP mode setting error
3. The exposure lamp is not bright enough. This may be caused by deterioration of the
exposure lamp or low lamp voltage.
4. In ADS mode, light reflected from the original is too intense.
5. The development bias is grounded.
Page 7-4
1.2 DIRTY BACKGROUND
The last paragraph of “Action ”should be corrected as follows.
If dirty background occurs only in ADS mode, do the following:
• Clean the optics and perform the necessary SP modes in order
(see Section 4 - Service Remarks for details)
• If the signal at CN112-3 stays HIGH, check the harness and sensor, and replace any
defective parts.
• If the signal at CN112-2 stays LOW, replace the main board.

RICOH TechnicalBulletin PAGE:3/3
Model: Skylark Date: 15-Apr-97 No: 4
- Reasons for correction -
1. SP56 (ADS Adjustment) should not be performed by itself. It should be performed as a
part of the procedure starting from cleaning the optics.
2. By performing SP56, the image density with ADS compared from the center notch
(manual ID) may become lighter, but will not become darker. So, if dirty background
occurs only in ADS mode, the standard image density may be out of specification.
3. Since SP56 is used to memorize the adjustment standard value, not for output value
checking, the words “If the ADS voltage is not within +-0.2 volts of the standard voltage
(2.5V) ” has been eliminated.

RICOH TechnicalBulletin PAGE:1/4
Model: Skylark Date: 30-Apr-97 No: 5
Subject: Paper Jam Prepared by :M.Ishihara
From: QAC 1st Field Information Dept. Checked by:T. Inoue
Classification: Troubleshooting
Mechanical
Paper path
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SYMPTOM:Paper jam
CAUSE:
(1) Paper is not fed smoothly at the paper turn section on the paper tray.
(2) The paper tray is not set in the machine correctly.
(3) The middle driven roller ( A184 2585 ) does not turn smoothly.
SOLUTION:
(1) A mylar has been prepared in the event that this problem occurs. See themylar
installation procedure and Fig.1 attached.
Though the part number of the Mylar is not fixed yet, it will be announced by MB
(Modification Bulletin) when the production line starts to use the Mylar.
(2) The paper tray can be set as shown inFig.2. The rail is not set on the Rear Rib as shown
in Fig.2. So both the left and right upper rails must be on the rear and front as
shown in Fig.3. Sometimes the upper or lower rail of the paper tray can be set as
shown in Fig.4. Remove the paper tray from the machine and re-set it as shown in
Fig.3.
(3) There is a possibility that the middle driven roller ( A184 2585 ) has burr on it and this
makes the roller stick. So file off the burr and check to see if the roller turns smoothly.

RICOH TechnicalBulletin PAGE:2/4
Model: Skylark Date: 30-Apr-97 No: 5
Mylar installation procedure
1. Remove the anti-stick cover from the Mylar [A]
2. Remove 4 small mylars [B] from the Paper Tray.
3. Attach the Mylar [A] to the ribs at the paper turn position in the paper tray.
Caution:
1) The Mylar [A] must be placed under the three mylars [C]
2) The length of the D portion must be 0 to 1 mm.
3) The length of the E portion must be 0 to 0.5 mm.
Drawing Part No. Description P/C Page Index No. Q’ty
BA184 2569 Paper Guide Mylar 13 13 4
CA184 2566 Paper Feed Guide 13 9 3
A
C
C
BC
E
D
Paper Tray
C
Fig.1

RICOH TechnicalBulletin PAGE:3/4
Model: Skylark Date: 30-Apr-97 No: 5
Fig. 3
Rear Rib
Rail
Rail
Front Rib
Paper Tray
Fig. 2