Ricoh B230 Service Manual
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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.