Ricoh B230 Service Manual

							 
SM 6-63 B230/B237 
Detailed 
Descriptions 
The by-pass tray has the separation pad system. The by-pass feed roller and separation 
pad [F] feed the top sheet of paper stack. 
6.10.12 BY-PASS PAPER SIZE DETECTION 
 
There are two paper side plates [A] on the by-pass tray. These connect with the paper size 
sensor [B] through a rack-and-pinion mechanism.  
						

							 
B230/B237 6-64  SM 
6.11 FUSING 
6.11.1 OVERVIEW 
 
 
1. Thermopile 
2. Tension roller 
3. Fusing roller 
4. Pressure roller 
5. Lubricant roller 
6. Cleaning roller 
7. Pressure roller fusing lamp 8. Pressure roller thermostat 
9. Pressure roller thermistor 
10. Fusing belt 
11. Heating roller 
12. Heating roller fusing lamps 
13. Heating roller thermostats 
14. Heating roller thermistor 
 
ƒ  A belt fusing system is used. This has a faster warm-up time than a conventional fusing 
and pressure roller system. 
ƒ  The heating roller is made of aluminum to increase the temperature of the fusing belt 
quickly. 
ƒ  The fusing roller is made of sponge, which flattens slightly, also increasing the fusing 
nip. This roller does not contain a fusing lamp. 
ƒ  The heating roller has two fusing lamps (one lamp heats the center and the other lamp 
heats the ends), and the pressure roller has one fusing lamp. 
ƒ  The heating roller thermistor, pressure roller thermistor and thermopile control the 
temperature of these lamps. The thermopile is a non-contact sensor. The thermopile 
detects the temperature at the center of the fusing unit, and the thermistor detects the 
temperature at the end.  
						

							 
SM 6-65 B230/B237 
Detailed 
Descriptions 
ƒ  Temperature is normally controlled by turning the fusing lamps on and off.   
ƒ  The lubricant roller supplies a small amount of oil to the pressure roller through the 
cleaning roller. An oil supply unit is not necessary because the amount of oil supplied 
to the pressure roller is small. 
6.11.2  FUSING UNIT DRIVE 
 
Belt and Rollers 
The fusing/paper exit motor drives the pressure roller [A] and the fusing roller [B] through 
the gear train, timing belt and clutch. The heating roller [C] is driven by the pressure with 
the fusing belt [D]. The cleaning roller [E] and lubricant roller [F] are driven by the friction 
with the pressure roller. 
Fusing Clutch 
The fusing clutch [G] turns off and cuts the drive power when the fusing unit does not 
operate. This mechanism prevents wear on the belt and rollers. 
 
ƒ  The fusing clutch turns off when images and patterns are created on the transfer 
belt during process control and line position adjustment. 
Lubricant Mechanism 
The lubricant roller [F] contains silicone oil in its material. The lubricant roller applies small 
amount of silicone oil to the pressure roller to reduce the friction between the pressure 
roller and thermistor.   
The cleaning roller [E] cleans the lubricant roller to remove the residual toner stuck to the 
lubricant roller.    
						

							 
B230/B237 6-66  SM 
6.11.3  PRESSURE RELEASE MECHANISM 
 
The pressure levers [A] put the proper pressure to the nip between the pressure roller [B] 
and fusing belt [C]. When releasing these levers, the pressure roller moves away from the 
fusing belt. If a paper jam occurs in the fusing unit, releasing these levers make jammed 
paper easily removed.   
6.11.4 FUSING TEMPERATURE CONTROL 
Components 
 
[A]: Thermostat 
[B]: Thermopile 
[C]: Thermostat  
						

							 
SM 6-67 B230/B237 
Detailed 
Descriptions 
[D]: Thermistor (non-contact) 
[E]: Thermistor (contact) 
[F]: Thermostat 
[G]: Pressure roller fusing lamp 
[H]: Heating roller fusing lamps 
Fusing Temperatures 
When the main switch turns on, the CPU turns on the fusing lamp. The lamp stays on until 
the thermistor detects the standby temperature. Then the CPU raises the temperature to 
the printing temperature. 
The fusing temperature for each mode is as follows. These are set by SP 1105. 
Mode Temperature of Heating Roller 
(°C) 
Temperature of Pressure 
Roller (°C) 
Machine ready  170 (SP1105-001)  50 (SP1105-007) 
Paper feed ready Machine ready - 10 
(SP1105-085) -- 
Print ready Machine ready - 10   
(SP1105-002) - 
Standby mode  165 (SP1105-010, -011)  150 (SP1105-012) 
Energy saver (panel 
off) mode 140 (SP1105-013, -014)  150 (SP1105-015) 
Low power mode  40 (SP1105-016, -017)  100 (SP1105-018) 
Off mode  Lamps off (SP1105-019, -020)  Lamps off (SP1105-021) 
Plain paper  160 (SP1105-030 to -036)  -- 
Thin paper  155 (SP1105-038 to -044)  -- 
Middle thick paper  170 (SP1105-109 to -112)  -- 
Thick 1 paper 
(one-sided) 165 (SP1105-046, -050)  -- 
Thick 1 paper 
(duplex, side 2) 170 (SP1105-048, -052)  --  
						

							 
B230/B237 6-68  SM 
Mode Temperature of Heating Roller 
(°C) 
Temperature of Pressure 
Roller (°C) 
Thick 2 paper    175 (SP1105-054, -055)  -- 
Thick 3 paper (full 
color) 180 (SP1105-089)  -- 
Thick 3 paper 
(black-and-white) 170 (SP1105-090)  -- 
OHP (full color)  175 (SP1105-056)  -- 
OHP 
(black-and-white) 165 (SP1105-057)  -- 
Special paper  165 (SP1105-058 to -080)  -- 
 
- Paper Weights - 
ƒ  Thin paper: Below 60 g/m
2 (16 lb) 
ƒ  Normal plain paper: 60 – 81 g/m
2 (16 – 22 lb.) 
ƒ  Middle Thick: 82 – 105 g/m
2 (22 – 28 lb.) 
ƒ  Thick 1: 106 – 169 g/m
2 (28.5 – 44.9 lb.) 
ƒ  Thick 2: 170 – 219 g/m
2 (45 – 58 lb.) 
ƒ  Thick 3: 220 – 253 g/m
2 (58.5 – 67 lb.) 
Temperature Corrections 
- Corrections for ambient temperature (SP 1112) - 
ƒ  If the room temperature is below 17°C, the heating roller temperature is increased by 
5°C. 
ƒ  If the room temperature is above 30°C, the heating roller temperature is decreased by 
5°C. 
- First print of a job (SP 1114) - 
ƒ  The heating roller temperature is increased by 10°C for the first 2 seconds of the job. 
- Corrections during the job (SP 1116) - 
ƒ  The fusing temperature can be reduced two times during the job. There are 
adjustments for the temperature at the center and at the ends. There are also 
adjustments for paper wider than 226 mm, and less than 226 mm. 
ƒ  With the default settings, fusing temperature at the center for paper widths less then  
						

							 
SM 6-69 B230/B237 
Detailed 
Descriptions 
226 mm is reduced by 5°C after 30 seconds, and again reduced by 5°C after 60 
seconds. 
Overheat Protection 
The CPU cuts power to the fusing lamp at the following times: 
ƒ  The heating roller or pressure roller temperature becomes higher than 230°C for one 
second or more   
SC 543 and SC 553 for the heating roller or SC 563 for the pressure roller show for this 
condition. 
ƒ  The heating roller or pressure roller temperature reaches 250°C. 
SC 544 and SC 554 for the heating roller or SC 564 for the pressure roller show for this 
condition. 
The following components are used if thermistor or thermopile overheat protection fails.   
ƒ  Two thermostats for the heating roller and two thermofuses for the pressure roller in 
series with the common ground line of the fusing lamp. 
ƒ  If one of the thermostat temperatures becomes higher than 234°C, it opens and 
cuts power to the fusing lamp.   
If the other thermostat temperature becomes higher than 235°C, it also opens and 
cuts power to the fusing lamp. 
ƒ  If either of the two thermofuse temperatures becomes higher than 154°C, the 
thermofuse opens and cuts power to the fusing lamp. 
 
ƒ  These thermofuses make a series circuit. 
In either case, the machine stops operation.  
						

							 
B230/B237 6-70  SM 
6.11.5 ENERGY SAVER MODES 
Overview 
 
When the machine is not being used, the energy saver function reduces power 
consumption by decreasing the fusing temperature. 
This machine has the following two types of energy saver modes: 
1. Panel-off mode  
2.  Auto Off mode 
These modes are controlled by the following UP and SP modes: 
ƒ  Panel off timer: User Tools – System Settings – Timer Setting – Panel Off Timer 
ƒ  Auto off timer: User Tools – System Settings – Timer Setting – Auto Off Timer 
Panel Off Mode 
Entering the panel off mode 
The machine enters the panel off mode when one of the following is done: 
ƒ  The panel off timer runs out. 
ƒ  The Clear Mode/Energy Saver Key is held down for one second. 
If the value in the panel off timer is larger than that in the auto off timer, the machine goes 
into the auto off mode. At this time it does not go into the panel off mode. To make the panel 
off mode effective, specify a value smaller than the values in the auto off timer. 
What happens in panel off mode 
When the machine is in the panel off mode, each of the fusing lamps are kept at the  
						

							 
SM 6-71 B230/B237 
Detailed 
Descriptions 
temperatures indicated in the table at the bottom of the page. The operation panel 
indicators are turned off except for the Energy Saver LED and the Power LED.   
If the controller receives an image print out command from an application program (e.g. to 
print incoming fax data or to print data from a PC), the temperature of each fusing lamp 
rises to print the data.   
Return to stand-by mode 
The machine returns to stand-by mode if one of the following is done: 
ƒ  The Clear Mode/Energy Saver Mode key is pressed 
ƒ  Any key on the operation panel or touch panel screen is pressed 
ƒ  An original is placed in the ADF 
ƒ  The ADF is lifted 
ƒ  A sheet of paper is placed in the by-pass feed table 
The return time from the panel off mode is less than 30 seconds. 
 
Mode Operation 
Switch Energy 
Saver 
LED Fusing Temperature +24V System 
+5V 
Panel off  On  On Heating roller: 100°C 
Pressure roller: 130°C On On 
 
Auto Off Mode 
There are two Auto Off modes: Off Stand-by mode and Off mode. The difference between 
Off Stand-by mode and Off mode is the machine’s condition when it enters the Auto Off 
mode. 
Entering off stand-by and off modes 
The machine enters the Off Stand-by mode or Off Mode when one of the following is done. 
ƒ  The auto off timer runs out. 
ƒ  The operation switch is pressed to turn the power off. 
If one or more of the following conditions exists, the machine enters Off Stand-by mode. If 
none of these conditions exist, the machine enters the Off Mode. 
ƒ  Error or SC condition 
ƒ  Image data is stored in the memory 
ƒ  During memory TX or polling RX 
ƒ  The handset is off hook 
ƒ  An original is in the ARDF  
						

							 
B230/B237 6-72  SM 
ƒ  The ARDF is open 
Off Stand-by mode 
The system +5V is still supplied to all components. When the machine detects a ringing 
signal or receives a stream of data for a print job, the +24V supply is activated. At this time 
the machine automatically prints the incoming message or executes the print job. 
Off Mode 
The system +5V supply also turns off. However, +5VE (+5V for energy saver mode) is still 
activated. When the machine detects a ringing signal, off-hook signal, or receives a print 
job, the machine returns to the Off Stand-by mode and the system +5V and +24V supplies 
are activated.   
Returning to stand-by mode 
The machine returns to stand-by mode when the operation switch is pressed. The return 
time is less than 45 seconds. 
Mode Operation 
Switch Energy 
Saver LED Fusing Lamp+24VSystem 
+5V Note 
Off  
Stand-by Off Off Off (On when 
printing) On On  
Off Off Off Off Off Off +5VE is 
supplied 
6.11.6 NEW UNIT DETECTION 
Fusing Unit, Image Transfer Belt Unit 
The fusing unit and image transfer belt unit each have a fuse. When the machine detects 
that the fuse is intact, the machine determines that a new unit is installed. Then a short time 
later, the fuse blows. 
PCU, Development Unit 
The development unit (as part of the PCU, or as a separate development unit) contains an 
ID chip. The ID chip contains information that tells the machine that the unit is new.