CONTENTS OUTLINE..................... 1 TOOLS ......................1 CIRCUIT DESCRIPTION ................2 Outline ........................2 CPU and Memory ....................4 Reset Control ......................6 EEPROM Control ..................... 7 Centronics Parallel Interface ..................8 Front Operator Panel ....................9 LED Head Control ....................10 Motor and clutch control ..................
OUTLINE This manual has been written to provide guidance for troubleshooting of the OKIPAGE6w Printer (primarily for its printed circuit boards), on an assumption that the reader is knowledgeable of the printer. Read the maintenance manual for this printer if necessary.
CIRCUIT DESCRIPTION Outline The circuit of OKIPAGE6w consists of a main control board, a main high voltage power supply board,a syb-high voltage power supply board and a power supply unit. The block diagram is shown in Fig. 3-1. The main control board controls the reception and transmission of data with a host I/f and processes command analysis, bit image development, raster buffer read.
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DRAM Bus Internal 1M x 4 (Data : 4) MASK ROM (Address : 11) 62KB LS07 16MHz HC125 +26V CN10 High Voltage Power Unit High Voltage Power Unit Power Supply Unit ID Unit Figure 3-1 OKIPAGE6w Block Diagram - 3 -...
CPU and Memory (1) CPU (MSM65917) CPU core nX-8 CPU clock 16 MHz Data bus width External 8 bits, Internal 8 bits (2) Program ROM ROM capacity 64k-bytes ROM type 512 kbits (64k x 8 bits) Access time 90 nsec (3) Resident RAM RAM capacity 512k bytes (1M x 4 bits D-RAM one piece)
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A08 to A15 EPROM ROCS (64k x 8 bits) DD00 to DD03 DA00 to DA09 IC11 DRAM DA10 (1M x 4 bits) RAS0 RAS1 RAS2 Main Control Board Figure 3-2 Block Diagram of CPU & Memory in OKIPAGE6w - 5 -...
EEPROM Control The BR93LC46A on the main control board is an electrical erasable/programmable ROM of 64- bit x 16-bit configuration. Data input to and output from the ROM are bidirectionally transferred in units of 16 bits through I/O port (EEPRMDT-P) in serial transmission synchronized with a clock signal from the CPU.
Parallel Interface Parallel data is received from a host system via parallel interface which is compliant to the IEEE1284 specification. 65 to 68, 71 to 74 DATA8-P PDATA1-P to PDATA8-P DATA1-P 2 to 9 PSTB-N STB-N BUSY-P BUSY-P ACK-N ACK-N PE-P PE-P SEL-P...
LED Lamp Control There is an LED lamp on the high voltage power supply board which is connected to and controled by the CPU on the main control board. The light from the LED lamp can be seen on the Lens Cover through the LED Lens. main control board high voltage power supply board LED-P...
LED Head Control An LED correcting head, which is capable of correcting the illumination of the LED for each dot, is being used in this printer. LED illumination correction function of 16 steps is carried out by using an EEPROM which is installed in the LSI that maintains the LED illumination correction values, and an LED correction drivers (MSM6731BWAF or MSM6732BWAF) together as a pair.
Motor and clutch control The electromagnetic clutch is driven by a control signal from the CPU and the drive circuit shown below. The main motor is driven by the control signals from the CPU and the driver IC. Main Motor +26V OPEN IC10...
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(2) Motor drive control Time T0 to T3 determines the motor speed, while the phase different direction between phase signals DMPH1-P and DMPH2-P determines the rotation direction. DMON-P signal control a motor coil current. According to the polarity of the phase signal, the coil current flow as follows: 1) +26V →...
Fuser Temperature Control The temperature change in a heat controller is converted into the electric potential TEMP corresponding to the change in the resistance value of a thermistor, and the resultant potential is fed back to the control circuit. The CPU performs ON/OFF control of the HEATON-P signal to keep the heat roller temperature constant in accordance with the state at which the thermistor voltage (TEMP) is read into directly by the AD converter of the CPU.
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Flowchart of Thermistor Circuit Check START HEATER OFF Short check timer(t16)set Time-out ? Short error TEMP ? Thermistor short error Thermistor error check timer (t2) set Thermistor disconnection check timer (t35) set Heater On Temperature > Tn To constant temperature control Thermistor error check timer (t2) within time...
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Temperature Controlled Temperature Time HEATER ON Temperature table THERMCMP-N Heater control mode Normal operation Fuser Error Check Paper Thickness 135˚C: light 140˚C: medium light 145˚C: medium 150˚C: medium heavy 155˚C: heavy - 16 -...
3.10 Sensor Control The CPU supervises the state of each sensor every 40 ms. Main Control Board High Voltage Power Supply Board TNRSNS-N PSIN-N PSOUT-N WRSNS-N Sensor signal Shield Transparent - 17 -...
3.11 Cover Open When the cover is opened, a cover open microswitch is opened. This makes a CVOPN-N signal low, thereby the CPU detects that cover is open. Furthermore, opening the cover stops applying a +5V power to the high voltage power supply part, resulting in stopping all high voltage outputs. Main Control Board High Voltage Power Supply Board High...
3.12 Power Supply Part (1) Power supply unit An AC power from an inlet is input to Switching Reg. part .AC power is converted to a +26 VDC output and +5 VDC output. Power supply unit ACIN +26V Filter Circuit Switching Reg.
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Control Signals and High Voltage Outputs Control signal name Level Function Makes the part put out a power to TR. +3 to 5 µA +0.5 to 4 KV TR1PWM (PWM) H/L(PWM) Makes the part put out a -750V power to TR. TR2PWM H/L(PWM) Makes the part put out a -1300V power to CH.
TROUBLESHOOTING Troubleshooting Table High Voltage Power Supply Board Note: A malfunction of the power supply is not repaired by an agency. The abnormality to be treated here is that of sensors only. Flowchart Failure PC Display Message A paper input jams occur frequently. A - 1 P A P E R I N P U T...
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Main Control Board Flowchart Failure PC Display Message Initialization error and not restored B - 1 C O N N E C T I O N P R O B L E M Program ROM error B - 2 P R O G R A M R O M C H E C K E R R O R Resident RAM error B - 3...
Troubleshooting Flowchart Paper input jams occur frequently. • Is PS4 (Write Sensor ) operating normally? • No Replace PS4. • Yes Is Pin1 of CN8 in main control board operating normally? • No Replace Q4 or Q5 in main control board. •...
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The message “COVER OPEN” remains displayed on the PC display. • Is CVSW (Cover Open Switch) operating normally? • No Replace CVSW. • Yes Failure of IC6 in main control board. The message “TONERLOW” remains displayed on the PC display. •...
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Initialization error and not restored • Is the 16-MHz clock signal being put out to pin 3 of OCS1? • No Replace OSC1. • Yes Failure of IC6 Program ROM error • Replace IC6) Resident RAM error • Are negative pulses being put out to Pin 4 , 23 (RAS0-N , CSA-N) of IC11? •...
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Data sent through the Parallel I/F cannot be received. • Is the signal at Pin 11 (BUSY-P) of CN4 being at low level? • No Is the signal at Pin 13 (BUSY-P) of IC7 (74LS07) changed as shown below, at data reception? ON-LINE OFF-LINE BUSY-P...
CIRCUIT DIAGRAM Figure 5-8 ~ 5-13 Main Control PCB (HUK) Circuit Diagram (Rev.1) Figure 5-14 High voltage Power Supply PCB (P2H-) Circuit Diagram (Rev.2) Figure 5-15 High voltage Power Supply PCB (P6L-) Circuit Diagram (Rev.2) - 27 -...
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