Ricoh Mp C3000 Service Manual

 
SM 6-21 B230/B237/D042 
Detailed 
Descriptions 
 
SP4-008-001  Sub Scan Mag  Sub Scan M
agnification Adjustment 
SP4-010-001 Sub Scan Reg  Sub Scan R
egistration Adjustment 
SP4-011-001 Main Scan Reg  Main Scan Registration Adjustment 
 
Also, before lens block replacement, enter
 the SP mode and note the settings of 
SP4685-001 &  002; SP4686-001 & 002; and SP4687-001  & 002 (Gray Balance Set for R, 
G, B). After lens block replacement, check c opy samples with the ARDF and Platen. If the 
copies have...

 
B230/B237/D042 6-22 SM 
6.5 LASER EXPOSURE 
6.5.1 OVERVIEW 
 
 
1. Synchronizing detector board: Y/C-E 
2. LD unit-Y 
3. LD unit-C 
4. LD unit-Bk 
5. LD unit-M   
6. Synchronizing detec tor board: Bk/M-S 
7. F-theta lens-Bk/M   
8. WTL-Bk  9. WTL-M 
10. Synchronizing det
ector board: Bk/M-E
11. Polygon mirror motor 
12. Synchronizing detector board: Y/C-S 
13. WTL-C 
14 WTL-Y 
15. F-theta lens-Y/C 
 
This machine uses four LD units and one polygon mirror motor to produce latent images on 
four OPC...

 
SM 6-23 B230/B237/D042 
Detailed 
Descriptions 
6.5.2 OPTICAL PATH 
 
The laser beams for black [A] and yellow [B] ar e directed to the upper part of the polygon 
mirror [C]. Laser beams for magenta [E] and black [D] are directed to the lower part of the 
polygon mirror. The LD mirrors (see the prev ious page) deflect the laser beams for 
magenta and black towards the lower polygon mirror.   
The WTL [F] corrects the main scan line. Without this component, the line bends out 
towards the middle of the...

 
B230/B237/D042 6-24 SM 
6.5.3  LASER SYNCHRONIZING DETECTORS 
 
Overview 
The machine has four laser synchronizing detector boards (LSD). There is one at each 
corner of the laser optics-housing unit. 
The four LSD boards detect the following: 
ƒ  [A]: Scanning end position for yellow and cyan 
ƒ  [B]: Scanning start position for yellow and cyan 
ƒ  [C]: Scanning end position for magenta and black 
ƒ  [D]: Scanning start position for magenta and black.   
The machine recognizes each color from  the...

 
SM 6-25 B230/B237/D042 
Detailed 
Descriptions 
6.5.4 LD SAFETY SWITCH 
 
A relay on the PSU ensures technician and us er safety. It also prevents the laser beam 
from turning on during servicing. This relay turn s off when the front cover, upper left cover, 
or right door is opened. At this time it cuts  the power (+5V) supplied to the LD board for 
each color through the BICU. 
Two safety switches are used to turn the re lay off. One switch is used for the front door. 
Another safety switch is used...

 
B230/B237/D042 6-26 SM 
6.5.5  AUTOMATIC LINE POSITION ADJUSTMENT 
Overview 
CC, KK, YY, MM: Spaces between two lines of the same color 
KC, KY, KM: Spaces between a black line and a color line 
 
During automatic line position adjustment, t he line patterns above are created eight times 
on the transfer belt. The spaces  between the lines (CC, KK, YY, MM, KC, KY, KM) are 
measured by the front, center, and rear ID sensors. The controller takes the average of the 
spaces. Then it adjusts the follo wing...

 
SM 6-27 B230/B237/D042 
Detailed 
Descriptions 
timing for that color. 
Main scan line position for YCM  
If the machine detects that t he image is out of position in  the main scan direction, it 
changes the laser write start timing for each scan line. 
Magnification adjustment for KYCM 
If the machine detects that magnification adjust ment is necessary, it changes the LD clock 
frequency for the required color. 
Skew for YCM 
The adjustment of the skew for YCM is based on the line position for K....

 
B230/B237/D042 6-28 SM 
outputs (SP2-193-004: [default: 200 pages) 
4.  Color counter > Output th reshold for color outputs (SP2-193-005: [default: 200 pages]) 
Interval: Job end:  
This starts automatically at the end of a print job. 
Line position adjustment is automatically done once  if one of these conditions occurs: 
1.  Δt > Time threshold (SP2-193-009: [default: 300 minutes]) 
2.  ΔT > Temperature threshold (SP2-193-008: [default: 5°C]) 
3.  B/W counter (SP3-510-005) + Color counter...

 
SM 6-29 B230/B237/D042 
Detailed 
Descriptions 
Main Scan Skew Adjustment 
 
The WTL positioning motors for magenta [A],  cyan [B], and yellow [C] adjust the angle of 
the WTL [D] respectively, based on the WTL pos ition for black. This mechanism corrects 
main scan skew.   
ID Sensors 
 
There are seven ID sensors. Three of them  are for the line position adjustment. Four of 
them are for process control. The ID sensor shutter [A] covers the sensors when the 
machine is idle. 
When the ID sensor...

 
B230/B237/D042 6-30 SM 
Shutter Mechanism 
 
The laser optics housing unit has a shutter. As  a result, toner and other dust do not fall on 
the glass of the laser optics housing. The shutter motor [A]  moves the shutter [B] in the 
direction of the arrow with the  cam [C] (to open: black arrow dire ction, to close: white arrow 
direction).  
First, the actuator [D] stays at the shutter  closed sensor [E]. The shutter motor opens the 
shutter and the actuator moves to the shutte r open sensor position...