Oki 3391 manual

All specifications are subject to change without notice. MICROLINE 3390/3391 PRINTER Maintenance Manual ¡[...]

iii PREF ACE This maintenance manual describes how to maintain the Microline 3390/3391 printer in the field. This manual is for customer engineers. For further information, refer to the Users Manual for handling or operating the equipment.[...]

i T ABLE OF CONTENTS 1. CONFIGURATION 1.1 Standard Printer Configuration 1.2 Options 2. THEORY OF OPERATION 2.1 Electrical Operation 2.1.1 Summary 2.1.2 Microprocessor and the Peripheral Circuit 2.1.3 Initialization 2.1.4 Parallel Interface Control 2.1.5 Print Control 2.1.6 SP/LF Motor Control 2.1.7 Operation Panel 2.1.8 Alarm Circuit 2.1.9 Power S[...]

ii 3.3.9 Carriage Cable 3.3.10 Backup Roller Holder Assy 3.3.11 Platen Assy 3.3.12 Driver Board (SRXD) 3.3.13 LF Motor 3.3.14 Operation Panel PCB (LEOP) 3.3.15 Control/Power Supply Board (SRXC) 3.3.16 Transformer Assy 3.3.17 Change Lever and Gears 3.3.18 Carriage Shaft 3.3.19 Paper Pan 3.3.20 Rear Tractor Assy 3.3.21 Rear Pressure Assy 3.3.22 Switc[...]

1. CONFIGURA TION[...]

1 – 1 1. CONFIGURA TION 1.1. Standard Printer Configuration This printer consists of the following assemblies: Figure 1-1 Configuration Sheet guide assy Platen knob Access cover assy Upper cover T ransformer assy Pull-up roller assy Operation panel assy Main frame Driver board Control/Power supply assy[...]

1 – 2 1.2 Options (1) Cut sheet feeder unit (CSF) (Narrow and wide versions available) (2) Pull-tractor assy Dual-bin CSF Single-bin CSF Attachment assy[...]

1 – 3 (5) Serial I/F • RS232C • RS422A • Current Loop (3) Bottom push tractor unit (4) Roll paper stand (Narrow only)[...]

2. THEOR Y OF OPERA TION[...]

2 – 1 2. THEOR Y OF OPERA TION 2.1 Electrical Operation The electrical operation of the printer circuit is described in this section. 2.1.1 Summary Fig. 2-1 shows the block diagram of the printer. The control board is made up of the microprocessors, peripheral circuits, drive circuits, sensors and interface connectors. The power to the control bo[...]

2 – 2 Figure 2-1 12.288 MHz 4 Vcc-Level TSD SEL-N AI INT Release-SW Bottom-SW PE-SENSOR OPERATION PANEL Serial Alarm -circuit Alarm-Odd Alarm-Even SP-Alarm Power-off Transformer Rectifier circuit 40 volt 8 volt 5 volt Reset circuit Print-IPT I/F-IPT EEPROM?[...]

2 – 3 (2) Program ROM This is a 256 × 16 bits (4M bit) [MAX] EPROM with the control program for the printer stored. The MPU executes instructions under this program. The program ROM is assigned to the program memory area of the MPU and is fetched by the PSEN signal of the MPU. The following shows the operation of the memory access. MPU CLOCK A0~[...]

2 – 4 (3) RAM (MSM51C464A-80RS) The RAM is CMOS dynamic RAM with (64K × 4-bit) × 2 configuration, and used as buffers (such as receiving buffer, printing buffer, DLL buffer and working buffer). The following shows the examples of the memory access operation. A0~A7 RAM 1 (Q3) MPU P03 CS1 RD OE D4~D7 D0~D3 RAS CAS RAM 2 (Q4) T1 T2 T3 Clockout* A0[...]

2 – 5 (4) CG ROM This is a 1024K × 16 bits (16M bits) MASK ROM with the font data for the characters stored. CG ROM is assigned to the program memory area of the MPU and is fetched by the PSEN signal of the MPU. The following shows the memory access operation. D0~D15 P02 PSEN MPU CG-N A0~A19 ROM Program IN Program I[...]

2 – 6 (5) EEPROM The EEPROM is a CMOS serial I/O type memory which is capable of electrically erasing and writing 1,024 bits. The EEPROM contains menu data. The following shows the memory access operation. MPU EEPROM EEDIN-P EECS-P EEDOUT-P EECLK-P P24 P27 P25 P26 D1 CS DO SK Ready Bus twp D0 D15 A0 A5 1 1 0 Start code Operation code Address Data[...]

2 – 7 (6) LSI This LSI detects and controls the SP motor speeds by monitoring the two phase sensor signals obtained from the DC motors and modifying the excitation phases as appropriate. This LSI is connected in multiplex to the MPU. P07 MPU A/D bus LSI RD WRL P01 ALE RDN WRL LSIC Clockout* A0~A19 LSICS ALE D0~D15 (Read) RD D0~D15 (Write) WRL Add[...]

2 – 8 2.1.3 Initialization This printer is initialized when the power is turned on or when the I-PRIME-N signal is input from the host side via the parallel interface. For the initialize operation, the RST-N signal is first output from the reset circuit to reset the MPUs and LSIs. When resetting ends, the program starts and the LSIs are reset by [...]

2 – 9 2.1.4 Parallel Interface Control The parallel data input from the host to the interfaced LSI is latched to its internal register at the falling edge of the STROBE-N signal. At the same time, the LSI sets the BUSY signal to the high level to inform the host that the data is being processed, and outputs the RXD signal to inform the MPU of dat[...]

2 – 10 2.1.5 Print Control Print data is transmitted as parallel data (HEAD1~HEAD24) from LSI to print head. LSI generates print timing and drive time. Print Data MPU LSI DRIVER HEAD1-N~ HEAD24-N Print Data Print Head Control/Power Supply Board A/D bus HEAD1~ HEAD24 Driver Board HEAD DRIVE TIMING CHART DT1 DT2 HEAD DRIVE CURRENT[...]

2 – 11 (d) Simultaneous Compensation of the number of impact pins The LSI is provided with the compensation table for each pin to make necessary compensation. Print Compensation Control The print compensation can be made as shown below: (a) Voltage compensation (See 2.1.8 “Alarm Circuit.”) (b) Temperature compensation (See 2.1.8 “Alarm Circ[...]

2 – 12 Head Gap Range 1 2 3 4 5 Print speed 100% 95% 85% 85% 80% Drive time Short Long (e) Print mode compensation According to the thickness of the printing medium, the print mode is compensated as shown in the table below: (Drive time lengthens at each step.)[...]

2 – 13 2.1.6 SP/LF Motor Control (1) Space Motor Control The SP motor driver (HA13412) drives the three-phase brushless motor based on the phase signal (SPU, SPV and SPW) and the speed instruction data from the LSI. The MPU can identify the current speed of the space motor by measuring through the LSI the pulse length of the output (øA, øB) of [...]

2 – 14 (2) Encoder Disk In the operation of the spacing motor, the PHASE-A and PHASE-B signals are generated when the encoder disk interrupts the photo sensor. The LSI divides these edge pulse signals in accordance with the print pitch, and sends the IPT signal to provide dot-on timing and carriage position detection timing. 1/720" 1/120&quo[...]

2 – 15 (3) LF Motor Control The LF motor driver (MTD2005F) drives the LF motor in two-phase or 1-2 phase bipolar, based on the phase changeover data and the output current data from the LSI. The data from the LSI is processed by a specific register contained in the LF motor driver to measure the overdrive time and to change the phase. [FORWARD] P[...]

2 – 16 2.1.7 Operation Panel The clock synchronization OPCLK of LSI is used to input the switch data and output the LED data through the operation panel control LSI (IC1: BU5148S). LSI OPTXD OPCLK OPCLR-N OPRXD 77 78 80 OPTD OPCK NPA2 OPRD Command and Data  latch LED Driver Switch controller +5V 79 A 2-byte (15 bits + 1 even parity bit) [...]

2 – 17 Note: From the illustration above, you can see that the command and the command response are output at the same time. This is because the bit 0 to bit 3 of OPRXD are fixed so that the response can be returned before decoding the command. OPTXD OPCLK OPRXD OPCLR-N 1 2 3 2 3 1 6 5 or 8 bit0 bit7 Comm[...]

2 – 18 2.1.8 Alarm Circuit (1) Head drive time alarm circuit This circuit monitors the drive time using the HDALM signal interlocked with the overdrive signal of each drive circuit. If the drive time of any drive circuit exceeds the specified time, the drive fault alarm circuit sends an ALARM-N signal to turn on the SCR (SO). This cause the secon[...]

2 – 19 Mode Speed Pass Direction 1 100% 1 Bi 2 85% 1 Bi 3 70% 1 Bi 4 55% 1 Bi 5 40% 1 Bi 6 30% 1 Bi 1.5 Sec Stop (7) Stop • When the temperature is between α° C and 119 ° C, the mode switches sequentially to higher level. When the temperature falls below ß ° C, the mode switches to lower level. • When the temperature exceeds 119 ° C, pr[...]

2 – 20 2.1.9 Power Supply Circuit This power supply circuit supplies the +5VDC, +8VDC, +40VDC, 10VAC. SW Fuse Noise filter circuit Trans- former Control Board Rectifier Rectifier Regulation Circuit +40V +8V +5V AC10V The uses of output voltages and signals are described below. Voltage/signal Use +5V Logic IC/LED drive voltage +8V Serial interface[...]

2 – 21 2.2 Mechanical Operation 2.2.1 Printhead mechanism and operation (See Figure 2-2.) The printhead is a spring charged 24-pin driving head using a permanent magnet. It is attached to the carriage, which moves in parallel with the platen. Electrically, this unit is connected to the control circuits through the control board. Figure 2-2 Arrang[...]

2 – 22 (2) Operation of printhead (See Figure 2-3.) (a) When the printhead is idle, the armature is attracted by a permanent magnet and the spring fixing the armature is compressed. The print wires fixed to each armature are thus concealed under the wire guide. (b) When a signal for a character to be printed is detected, a current flows through t[...]

2 – 23 (1) When printing (2) When not printing Paper Print wire Printhead Platen Paper Paper Armature assembly Print wire Thermistor Wire guide Yoke Spacer Magnet assembly Figure 2-3[...]

2 – 24 2.2.2 Spacing operation (See Figure 2-4.) The spacing mechanism consists of a carriage shaft mounted in parallel with the platen, and a carriage frame that moves along the shaft. It is driven by a DC motor mounted on the bottom of the carriage frame. Items included in the spacing mechanism are as follows: (a) DC motor with motor gear (b) C[...]

2 – 25 Figure 2-4 Print Head Carriage shaft Carriage frame Space rack Encoder disk Encoder sensor Motor gear Guide rail Slider[...]

2 – 26 2.2.3 Head gap adjusting (See Figure 2-5.) The head gap adjusting lever moves back and forth to tilt the carriage frame, altering the gap between the printhead and the platen. The adjusting screw, which is connected to the adjusting gear rotates when the adjusting lever is moved creating a fine gap adjustment. If the adjusting gear is push[...]

2 – 27 Figure 2-5 Platen Range 1 2 3 4 5 Adjusting lever Idler gear Adjusting gear Carriage shaft Printhead Adjusting screw Range from 5 to 1 Adjusting cam Adjusting screw C.C.W. Printhead Narrows Platen Guide rail Range from 1 to 5 Widens C.W.[...]

2 – 28 2.2.4 Ribbon drive (See Figure 2-6.) The ribbon driver mechanism moves the ribbon in synchronization with the space motor operation. The ribbon drive mechanism consist of the following items: (a) Ribbon drive gear assembly (b) Ribbon gear (space motor) (c) Ribbon cartridge (1) Ribbon cartridge An endless ribbon with a single direction feed[...]

2 – 29 Figure 2-6 Ribbon cartridge Drive gear Ink tank[...]

2 – 30 2.2.5 Paper feed operation Feeding of the paper is performed by turning the platen and the pin tractor, which is driven by the LF pulse motor. Item of the paper feed mechanism are as follows: (a) Pulse motor with gears (b) Decelerating gear (c) Platen (d) Tractor feed unit (e) Pressure roller[...]

2 – 31 (1) Cut sheet and continuous sheet switching mechanism (See Figure 2-8.) Three different paper paths can be selected and set by the change lever. (a) TOP (for cut sheet) When the cut sheet is used in the manual mode or fed by the CSF (option), set the change lever at the position marked TOP. [Operation] The driving force of the platen gear[...]

2 – 32 (c) BOTTOM (Continuous sheet from bottom feeder) (option) When the change lever is set in the BOTTOM position, the rotation of the platen is transmitted to the drive gear of the bottom tractor feed unit through the idle gear to feed the sheet which has been set in the bottom tractor feed. At the same time, the switch lever turns on the bot[...]

2 – 33 BOTTOM Change lever Tractor gear Figure 2-8 Platen TOP REAR Change gear Reset spring Idle gear (Bottom tractor unit) Platen gear (R) Control Power supply Assy Change gear shaft Change lever Change arm Release shaft Switch lever Bottom switch Rear switch[...]

2 – 34 (2) Cut-sheet feeder operation (See Figure 2-9.) The pulse motor used for the paper feed mechanism is mounted on the left of the frame, and the rotation of the motor is transmitted through decelerating gears (LF idle gear, platen gear) to the platen. When using cut-sheet paper, the change lever must be in the TOP position to grab the paper[...]

2 – 35 (3) Continuous paper feed operation (Rear) (See Figure 2-10.) The force transmitted to the platen, rotates the tractor gear through platen gear, the idler gear and the change gear. The rotation of the tractor gear makes the pin tractor belt rotate through a sheet feeder shaft, feeding the continuous paper. Paper Idle gear Change gear Tract[...]

2 – 36 (4) Push and pull tractor mechanism (Option) (See Figure 2-11). This mechanism consist of an optional pull tractor and a standard push tractor mechanism. This mechanism can perform forward and reverse feed by setting continuous sheets to the push tractor and pull tractor. The rotation of the platen is transmitted to the push tractor and th[...]

2 – 37 (5) Pull tractor mechanism (option) (See Figure 2-12.) Bottom feed of continuous sheets is possible only when an optional pull tractor unit is installed. The rotation of the platen is transmitted to the idle gear of the pull tractor unit through the platen gear at the left end of the platen. The rotation of the idle gear is transmitted to [...]

2 – 38 (6) Bottom push feed operation (option) (See Figure 2-13). The bottom push feed of the continuous sheet is possible only when the bottom tractor feed unit is installed. When the platen rotates, the rotational force of the platen is transmitted through the tractor idle gear and the tractor change gear to the tractor drive gear of the bottom[...]

2 – 39 (7) Paper clamp mechanism (See Figure 2-14.) When setting the change lever to the BOTTOM , TOP or REAR position, the operation of the front release gear arm changes according to the position of the release cam. And at the same time, the position of the cam installed to the front release gear shaft changes, and the open and close of the pre[...]

2 – 40 Figure 2-14 REAR Release cam Platen TOP BOTTOM Change arm Change lever[...]

2 – 41 2.2.6 Paper detection mechanism (See Figure 2-15.) (1) Cut sheet detection When the cut sheet is inserted, the point A is pushed backward and the paper near end lever B rotates counter clockwise (CCW). At this time, the rear sensor lever rotates counterclockwise (CCW), the rear sensor lever and pulls out of the rear and top paper end senso[...]

2 – 42 Sensor lever Paper end sensor Shaded portion A B Paper end lever Bottom paper end lever Figure 2-15[...]

2 – 43 (4) Top line print mechanism (See Figure 2-16). The front edge of the sheet is protected by the ribbon protector so that it can stop at a position just near to the print head (0 tear off position) to start printing at the front end of the sheet, without causing the sheet to crumple or curl up. The printing starts at the front end of the sh[...]

2 – 44 Figure 2-16 Ribbon protector Platen Printhead Carriage frame assembly[...]

2 – 45 2.2.7 Automatic sheet feed This function is used to feed in the sheet automatically up to the print start position when the cut sheet or the continuous sheet is used. [Operational procedure] (1) When using the cut sheet 1) Set the change lever to the TOP position. (See Figure 2-17.) 2) Insert a sheet of paper between the platen and the pap[...]

2 – 46 (2) When using the continouos paper 1) Set the change lever either to the rear side or the bottom side position. (See Figure 2-17.) 2) Set a sheet of paper either to the push tractor or the bottom tractor. 3) Press the “FF/LOAD” switch. 4) The LF motor starts its operation to feed the paper up to the print start position. 5) The paper [...]

2 – 47 2.2.8 Paper park function (continuous paper) Continuous sheets which have been inserted can be reversed automatically by using the “PARK” button on the operation panel. 1) Press the “PARK” button on the operation panel. 2) Reverse LF is started and paper is fed in reverse until paper end occurs or 19 inches maximum have been fed. 3[...]

3. ASSEMBLE/DISASSEMBLE[...]

3 – 1 3. ASSEMBL Y/DISASSEMBL Y This section explains the procedures for removing and installing various assemblies and units in the field. Description is mainly limited to the removal procedure; installation should basically be performed in the reverse sequence of the removal procedure. 3.1 Precaution for Parts Replacement (1) Remove the AC cabl[...]

3 – 2 3.2 Service Tools Table 3.1 lists the tools necessary for replacing printed circuit boards and parts of units in the field. Table 3.1 Service tools 1 No. 1-100 Phillips 1 Screws screwdriver 2.6 mm 2 No. 2-200 Phillips 1 Screws screwdriver 3-5 mm 3 No. 3-100 1 screwdriver 4 Spring hook 1 5 J-YX4025–83335-3 1 Head gap adjustment 6 Volt/ohmm[...]

3 – 3 3.3 Disassembly/Reassembly Procedure This section explains the assembly replacement procedures according to the following disassembly system. [Parts Layout] Figure 3-1 Printer unit Upper cover assy Transformer assy Control/Power supply board Printhead Driver board Printer unit Operation panel board[...]

3 – 4 [How to Change Parts] This section explains how to change parts and assemblies appearing in the disassembly diagram below. Printer unit 3.3.1 Printhead 3.3.2 Ribbon protector 3.3.3 Pull-up roller assy 3.3.4 Upper cover, access cover and sheet guide 3.3.5 Gear case assy 3.3.6 PC connector 3.3.7 Space motor and guide roll[...]

3 – 5 3.3.1 Printhead (1) Open the access over. (2) Pull up and rotate the head clamp 1 to unclamp the printhead 2 as shown fig. 3.3.1. (3) Disconnect the printhead 2 from PC connector 3 . (4) To install, follow the removal steps in the reverse order. Notes on installation: (1) Insert the printhead 2 into the PC connector 3 while pushing it again[...]

3 – 6 3.3.2 Ribbon Protector (1) Remove the printhead (see 3.3.1). (2) Open the pull-up roller cover 1 . (3) Raise and remove the ribbon protector 2 . (4) To install, follow the removal steps in the reverse order. 1 2[...]

3 – 7 3.3.3 Pull-up Roller Assy (1) Open the access cover 1 . (2) Lift up the sheet guide Assy 4 to remove. Note: Please do after always removing the sheet guide Assy 4 when the pull-up roller Assy 2 is installed and removed. (3) Tilting the pull-up roller Assy 2 toward the front, remove from the shaft of platen Assy 3 . (4) To install, follow th[...]

3 – 8 3.3.4 Upper Cover Assy, Access Cover Assy and Sheet Guide Assy (1) Pull off the platen knob 1 . (2) Turn the change lever 2 toward the bottom position. (3) Insert a flat-blade screwdriver into grooves (5 places) (4 places for narrow type) of frame and twist to disengage claws of upper cover 3 . (4) Raise the front side of upper cover Assy 3[...]

3 – 9 2 4 3 1 3.3.5 Gear Case Assy (1) Remove the printhead (see 3.31). (2) Remove the upper cover (see 3.3.4 (1) – (5)). (3) Move the carriage Assy to right hand side, remove two screws 1 , then the space motor 2 . (4) Disconnect a carriage cable. (5) Disengage claws (4 places). Using a flat-blade screwdriver, push to widen the claw for easy d[...]

3 – 10 3.3.6 PC Connector (1) Remove the printhead (see 3.3.1). (2) Remove the upper cover (see 3.3.4 (1) – (5)). (3) Remove the gear case Assy (see 3.3.5). (4) Remove the PC connector 1 from the space motor Assy 2 . (5) To install, follow the removal steps in the reverse order. Note on installation: (1) Do not touch the space motor 2 or termin[...]

3 – 11 D 3.3.7 Space Motor, Guide Roller Assy (1) Remove the printhead (see 3.3.1). (2) Remove the upper cover (see 3.3.4 (1) – (5)). (3) Remove the gear case Assy (see 3.3.5). (4) Remove the PC connector (see 3.3.6). (5) Remove screw 2 , then the guide roller Assy 3 from the space motor 1 . (6) To install, follow the removal steps in the rever[...]

3 – 12 3.3.8 Space Rack (1) Remove the printhead (see 3.3.1). (2) Remove the upper cover (see 3.3.4 (1) – (5)). (3) Remove the gear case Assy (see 3.3.5). (4) Remove the space motor (see 3.3.7). (5) Remove the spring 1 . (6) Disengage the claw on left side of space rack 2 from the frame, and remove the space rack 2 in upper direction. (7) To in[...]

3 – 13 3.3.9 Carriage Cable (1) Remove the printhead (see 3.3.1). (2) Remove the upper cover (see 3.3.4 (1) – (5)). (3) Remove the gear case Assy (see 3.3.5). (4) Remove the space motor (see 3.3.7). (5) Remove the space rack (3.3.8). (6) Remove two screws 1 , release the driver board 2 and PCB sheet 9 by lifting clamp 8 , and disconnect cable f[...]

3 – 14 3.3.10 Backup Roller Holder Assy (1) Remove the printhead (see 3.3.1). (2) Remove the upper cover (see 3.3.4 (1) – (5)). (3) Remove the gear case Assy (see 3.3.5). (4) Remove the space motor (see 3.3.7). (5) Remove the backup roller spring 2 . Disengage claws (2 places) of roller holder from the carriage frame 1 , and remove the backup r[...]

3 – 15 3.3.11 Platen Assy (1) Remove the printhead (see 3.3.1). (2) Remove the ribbon protector (see 3.3.2). (3) Remove the pull-up roller Assy (see 3.3.3). (4) Remove the upper cover (see 3.3.1 (1) – (5)). (5) Turn the change lever 1 to the bottom position. (6) Push in the lock levers 2 on both sides to unlock from the frame, then rotate them [...]

3 – 16 3.3.12 Driver Board (SRXD) (1) Remove the upper cover (see 3.3.4 (1) – (5)). (2) Remove two screws 1 , and release the driver board 2 and PCB sheet 5 by lifting clamp 4 . (3) Disconnect all cables from driver board 2 . (4) To install, follow the removal steps in the reverse order. Note on installation: (1) Insert one sensor lever 3 betwe[...]

3 – 17 3.3.13 LF Motor (1) Remove the printhead (see 3.3.1). (2) Remove the ribbon protector (see 3.3.2). (3) Remove the pull-up roller Assy (see 3.3.3). (4) Remove the upper cover (see 3.3.4 (1) – (5)). (5) Remove the platen Assy (see 3.3.11). (6) Remove the driver board (see 3.3.12). (7) Remove the left FG plate 1 . (8) Release the lock A to [...]

3 – 18 3.3.14 Operation Panel PCB (LEOP) (1) Remove the upper cover (see 3.3.4 (1) – (5)). (2) Disconnect the cable 1 from connector 3 of Driver board 2 . (3) Disengage claws on both sides from the frame, and remove the operation panel 4 . (4) Open claws (8 places) and remove the operation panel PCB 5 from the operation panel 4 . (5) To install[...]

3 – 19 3.3.15 Control/Power Supply Board (SRXC) (1) Remove the upper cover (see 3.3.4 (1) – (5)). (2) Disconnect two flexible cable 3 from the connector 2 the Control/Power Supply Board 1 . (3) Remove the cable 5 from the connector 4 on the Control/Power Supply board 1 . (4) Remove two screws 6 , and remove the Control/Power Supply Board 1 . (5[...]

3 – 20 3.3.16 Transformer Assy (1) Remove the upper cover (see 3.3.4 (1) – (5)). (2) Remove AC inlet 1 and AC switch 2 from the frame guide. (3) Disconnect the cable 3 from the connector 4 on the Control/Power Supply Board 5 . (4) Remove a screw 6 and disconnect ground cable 7 . (5) Remove two screws 8 and shift the transformer Assy 9 to the le[...]

3 – 21 3.3.17 Change Lever and Gears (1) Remove the upper cover (see 3.3.4 (1) – (5)). (2) Remove the reset spring 1 , then remove the idle gear 2 , the tractor gear 4 and the change gear 5 . (3) Push back the protrusion of the Change Gear Shaft 6 with a flatblade screw driver to remove the change lever 3 . (4) To perform mounting, follow the r[...]

3 – 22 3.3.18 Carriage Shaft (1) Remove the printhead (see 3.3.1). (2) Remove the upper cover (see 3.3.4 (1) – (5)). (3) Remove the driver board (see 3.3.12). Remove the FG plate (L) 2 . (4) Slide the carriage shaft 1 to the left side (in the direction of the arrow) to remove. (5) To perform mounting, follow the reverse procedure of removal. No[...]

3 – 23 3.3.19 Paper Pan (1) Remove the printhead (see 3.3.1). (2) Remove the ribbon protector (see 3.3.2). (3) Remove the pull-up roller assy (see 3.3.2). (4) Remove the upper cover assy (see 3.3.4 (1) – (5)). (5) Remove the platen assy (see 3.3.11). (6) Release claws A . (7) Lift up the paper chute assy 1 and remove. (8) To perform mounting, f[...]

3 – 24 3.3.20 Rear Tractor Assy (1) Remove the printhead (see 3.3.1). (2) Remove the ribbon protector (see 3.3.2). (3) Remove the pull-up roller assy (see 3.3.3) (4) Remove the upper cover (see 3.3.4 (1) – (5)). (5) Remove the reset spring (see 3.3.17 (3)) (6) Remove the tractor gear 1 . (7) Shift the drive shaft 2 to the right side to remove ([...]

3 – 25 3.3.21 Rear Pressure Assy (1) Remove the upper cover (see 3.3.4 (1) – (5)). (2) Remove the change lever and gears (see 3.3.17). (3) Remove the paper pan (see 3.3.19). (4) Remove the rear pressure roller 1 . (5) Rotate the release shaft 2 and move it to the left to detach the release shaft 2 . Match the Main Frame Rib A with the protrusio[...]

3 – 26 3.3.22 Switch Lever (1) Remove the upper cover (see 3.3.4 (1) – (5)). (2) Remove the change lever and gears (see 3.3.17). (3) Remove the paper pan (see 3.3.19). (4) Remove the rear pressure assy (see 3.3.21). (5) Pull the Switch Lever toward you and remove it upward. (6) To install, follow the removal step in the reverse order. Remark on[...]

4. PERIODIC MAINTENANCE[...]

4 – 1 4. ADJUSTMENT (1) Be sure to carry out this adjustment with the printer mechanism mounted on the lower cover. (2) Be sure to carry out this adjustment operation on a level and highly rigid work table (flatness: less than 0.039 inch or 1 mm) so as to minimize adjustment error.[...]

4 – 2 Item No. Specification Drawing Adjustment method Gap between the plat- en and the print head 1 ) Parallelism ad- justment 4–1–1 Variation of value at the left, the center and the right shall be less than 0.02 mm It shall be measured at 3 points: the left end, the center and the right end of the platen. Adjustment method (1) Gap between [...]

4 – 3 Item No. Specification Drawing Adjustment method Note 1) The head gap shall be measured with the change lever set to rear position. Note 2) The head gap shall be measured positioning the platen gear (R) craw on the top. Note 3) Move the adjust screw in clockwise direction (in direction B) to measure. Measure variation of gap when range is c[...]

4 – 4 Item No. Specification Drawing Adjustment method Gap between the con- tact and the monitor 0.3mm or more Touching Adjust lever Contact Motor PCB Confirm followings. Make sure that the gap between the con- tact and the motor PCB is 0.3 mm or more. At the time of printing test, make sure that the contact touches the motor PCB and it becomes r[...]

4 – 5 Item No. Specification Drawing Adjustment method 4–2 1 ± 0.5 Confirm followings. (1) When the change lever is set at Friction position, the gap between the platen and the paper pan at the rear side shall be 1 ± 0.5mm. (2) When the change lever is set at Rear or Bottom position, the gap between the pla- ten and the paper pan at the front[...]

4 – 6 Item No. Specification Drawing Adjustment method Rotation of the push tractor 4–4–1 To confirm: The tractor gear shall rotate smoothly when the change lever is set at Friction posi- tion. Backlash between gears 4–4–2 Approx. 0.05 to 0.11 mm To confirm: There shall be slight backlash between gears to allow smooth rotation of gears. ([...]

4 – 7 Item No. Specification Drawing Adjustment method Ribbon feed 4–5–1 To confirm: Ribbon shall be fed smoothly when the carriage is moved from side to side. Running load to spac- ing mechanism 4–5–2 To confirm: Make sure that the power is turned off at the time of measure- ment. 250g or less without a rib- bon cartridge Ribbon feeding [...]

4 – 8 Item No. Specification Drawing Adjustment method 4–6 To confirm: The idle gear of the LF motor and the platen gear (L) and the bias gear of the platen shall be in mesh in such way that the platen gear (L) and the bias gear rotate against each other to pinch the teeth of idle gear. The idle gear stays in mesh with the platen gear (L) and t[...]

5. TROUBLESHOOTING FLOWCHARTS[...]

5 – 1 5. CLEANING AND LUBRICA TION 5.1 Cleaning [Cautions] 1. Be sure to turn OFF the AC POWER switch before cleaning. Remove the AC Power cord from the printer. 2. Avoid dust inside the printer mechanism when cleaning. 3. If a lubricated part has been cleaned, be sure to apply lubricating oil to that portion after cleaning. (1) Cleaning time Whe[...]

5 – 2 Carriage shaft[...]

5 – 3 5.2 Lubrication This printer is designed to be maintenance free and requires no lubrication during normal operation. However it is necessary to apply lubricant in case the printer is disassembled, reassembled, cleaned or parts have been changed. (1) Cleaning time Remarks: 1) Turn off the power before cleaning. 2) Make sure that paper dust w[...]

6. SP ARE P ARTS LIST[...]

6 – 1 6. TROUBLESHOOTING AND REP AIR 6.1 Items to Check Before Repair (1) Check the inspection items specified in the instruction manual. (2) Find out as many details of the trouble as possible from the customer. (3) Inspect in the conditions as close as possible to those at the time the trouble occurred. (4) Proceed with the repair as follows: C[...]

6 – 2 6.3 Lamp Display (1) Printer mode display Table 6.2 Note: BLINK1 : 400ms ON, 400ms OFF BLINK2 : 200ms ON, 200ms OFF — : LED is kept in Current Condition (no change) (2) Fault alram display When the printer detects any of the various alarm states, the information is displayed as shown below on the operation panel. The alarm is specified by[...]

6 – 3 (3) Fatal Alarm Table 6.3 (1/2) ALARM CATEGORY ALARM LED DISPLAY ALARM 10 12 15 17 20 PROP UTILITY PRESTIGE BOLD REMARKS TROUBLESHOOTING MAIN CONTROL ALARM FIRMWARE DETECTION ALARM SERIAL INTERFACE ALARM MPU internal RAM alarm Program ROM alarm RAM on Con[...]

6 – 4 ALARM CATEGORY ALARM LED DISPLAY ALARM 10 12 15 17 20 PROP UTILITY PRESTIGE BOLD REMARKS TROUBLESHOOTING SPACING ALARM Spacing alarm Print Head homing alarm Print Head A/D alarm Space IPT is not occurred within in specified timing. : LED Blink (200ms ON, 200ms OFF)?[...]

6 – 5 AC connector Switch Transformer Centro-connector Control/Power Supply Board LF motor Print head Driver board Operation panel board Space motor[...]

6 – 6 6.4 Connection Circuit Check for Printhead and SP/LF Motor (1) Printhead Signal Connector pin number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 FG HD1 HD3 HD9 HO11 CO[...]

6 – 7 (2) Line Feed Motor Resistance of each coil should be about 7.6 Ω . Signal Connector pin number LF1 LF2 LF3 LF4 CN6 LF motor[...]

6 – 8 (3) Space Motor Resistance of each coil should be about 5 Ω . Signal Connector pin number SP-U SP-V SP-W SPA SPB + 5V EL CN2 SP Motor øA øB DA Vcc DK G 200 Ω 3 5 2 20 10 11 18 R1[...]

6 – 9 6.5 Troubleshooting flow chart 1 Power is not supplied. Is the AC cable connected correctly? Yes No Connect the AC cable correctly. Is fuse F1 on the transformer assy/or F1 on the control/power supply board blown? No Yes Replace fuse (with same type and rating). Remedied? No Yes End Does DC + 8V out? No Yes Remove Print Head. (Turn power of[...]

6 – 10 Driver Board CN2 20 •••••••••••• 1 No Yes Replace Driver Board. Replace Transformer Assy. Remedied? No Yes End Replace Control/Power Supply Board. Pin No. 20 19 18 17 16 15 14 13 10 9 8 7 6 5 Signal +8V EP +40V A C E L +5V (F.G) 10V (0V)[...]

6 – 11 2 No spacing operation (The alarm LED Blinks) Is carriage assembly binding or jammed? No Yes Check around space motor to repair the mechanism of space rack, back up roller, ribbon feed mechanism, and carriage frame etc. Replace space motor assy. Remedied? No Yes End Replace Driver Board Remedied? No Yes End Replace carriage cable.[...]

6 – 12 3 Homing does not end normally Yes No Check around space motor to repair the mechanism. (Space rack, ribbon feed assembly back up roller, carriage frame, support protector and ribbon protector.) Remedied? No Yes End Replace space motor assy. Replace space motor assy. Remedied? No Yes End Replace carriage cable Remedied? No Yes End Replace [...]

6 – 13 4 Paper jam while paper insertion Jam 1 Check around pressure roller mechanism. • Front pressure springs are narrow: 3 pcs; wide: 5 pcs) mounted properly or not. • Tension of all of front pressure rollers is properly. • Make sure of the fitting position of change gear shaft, change arm shaft and release shaft are correct. Check the r[...]

6 – 14 5 Smearing/Missing Dots Does ALARM LED blink and display alarm? No Yes See Tables 6.2 and 6.3 for troubleshooting information. Replace print Head. Remedied? No Yes End Replace Driver Board Remedied? No Yes End Replace carriage cable or space motor assembly.[...]

6 – 15 6 Faint or dark print Is the print head gap set properly? Yes No Adjust the print head gap (see section 5) Remedied? No Yes End Replace print Head. Remedied? No Yes End Replace Driver Board Remedied? No Yes End Replace ribbon feed mechanism[...]

6 – 16 7 Ribbon feed trouble Remove the ribbon cartridge. Move carriage to left and right. Does the ribbon drive shaft rotate? No Yes Change ribbon cartridge. Remove ribbon feed mechanism. Move carriage to left and right. Does the ribbon drive shaft rotate? No Yes Replace ribbon feed mechanism Replace space motor assy.[...]

6 – 17 8 Line feed trouble Turn the power off, and rotate the platen manually. Does the platen rotate smoothly? Yes No Is the platen gear (L) broken? No Yes Replace platen assembly Is the LF motor idle gear broken? No Yes Replace the LF motor assembly or LF idle gear. Is the platen gear (R), idle gear or change gear broken? No Yes Replace the gea[...]

6 – 18 9 Malfunction of switch on operation panel Is the CN1 of operation panel connected to the CN3 on the Driver Board? Yes No Connect the cable properly. Replace operation Panel Board Remedied? No Yes End Replace Driver Board[...]

6 – 19 10-1 0 Data receiving failure Is the SEL LED blinking? No Yes Printer went into the print suppress mode. Wait until printer to receives DC1 code, or change the menu item “Print suppress-Ineffective” when the function is not required. Is the I/F RS232C? No Yes To step 10-2 Does the SEL LED light up? Yes No Press SEL key. Remedied? No Ye[...]

6 – 20 10-2 (RS232C I/F) Printer I/F pin assignment. Is the correct cable used? TXD 2 pin, RXD 3 pin, Yes No SSD 11 pin, DTR 20 pin, Change I/F cable DSR 6 pin. Is ALARM LED blinking? No Yes See tables 6.2 and 6.3 for the troubleshooting. Make sure of the parameters for RS232C in the menu are correct. Baud rate Bit length Parity Protocol Busy sig[...]

6 – 21 Replace RS232C Board Remedied? N o Y e s End Replace Driver Board[...]

APPENDIX A[...]

APPENDIX A – 1 APPENDIX A BIT IMAGE GRAPH IS — DOT DENSITY (No adjacent dots allowed) 1/144 inch Double speed quad density Double speed double density Double Single D 1/60 inch DOT D/2 1/120 inch DOT D/2 1/120 inch DOT D/4 1/240 inch DOT D = 1/60 inch[...]

A – 1 A. PCB LA YOUT PCB list (1) Circuit board SRXC (Control/Power Supply) (2) Circuit board SRXD (Driver) (3) Circuit board LEOP (Operation Panel) (1) Control/Power Supply Board (SRXC) (2) Driver Board (SRXD) (3) Operation Panel Board (LEOP) Short Plug Setting Default 1 - 2: 2 - 3: 4 Mbit EPROM 1 M/2 Mbit EPROM SP1 SP2 (A) - (B) and SP3 (A) - ([...]

APPENDIX B[...]

B – 1 B. SP ARE P ARTS LIST Quantity per year: Indicates the recommended number of each part that should be ordered for routine maintenance for one year for 500 units of printers and assuming that the printers are operated for 2 hours/day of 600 hours/year. The following codes are used to indicate the number of printers for which maintenance part[...]

B – 2 Figure 11-1 Upper Cover Assy 1 2 3[...]

B – 3 No. Part No. Description Q'ty Q'ty Remarks Required 1 1PP4128-1186P3 Upper cover (N) 1 2 For ML3390 1PP4128-1231P3 Upper cover (W) 1 2 For ML3391 2 1PA4094-7305G10 Sheet guide assy (N) 1 2 For ML3390 1PA4094-7308G11 Sheet guide assy (W) 1 2 For ML3391 3 2PA4128-1237G1 Access cover assy (N) 1 2 For ML3390 2PA4128-1241G1 Access cove[...]

B – 4 Figure 11-2 Printer General Assy 1 6 9 8 2 7 4 5 3 11 10[...]

B – 5 No. Part No. Description Q'ty Q'ty Remarks Required 1 2PP4025-2871P21 Platen Knob 1 1 2 4YA4042-1545G302 Control/Power supply 1 9 Without ROM board (SRXC) 3 4YA4042-1544G1 Driver board (SRXD) 1 9 4 4YA4042-1516G4 Operator panel board 1 3 (LEOP) 5 3PP4044-5360G3 Operation panel 1 2 6 3YS4011-1266P1 AC cord 1 1 7 4YA4023-3101G1 Prin[...]

B – 6 Figure 11-3 Printer Unit 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 37 36 9 33 34 35 32 31[...]

B – 7 Figure 11-3 Printer Unit No. Part No. Description Q'ty Q'ty Remarks Required 1 3PA4044-5002G2 Main Frame (N) 1 2 For ML3390 3PA4044-5152G2 Main Frame (W) 1 2 For ML3391 2 3PP4044-5012P1 Bottom paper end lever 1 1 3 4PP4044-5019P2 Pressure spring (F) 3 2 For ML3390 4PP4044-5019P1 Pressure spring (F) 5 4 For ML3391 4 4PP4044-5031P2 [...]

B – 8 No. Part No. Description Q'ty Q'ty Remarks Required 23 3PA4044-5025G2 Platen assy (N) 1 3 For ML3390 3PA4044-5159G2 Platen assy (W) 1 3 For ML3391 24 3PP4044-5010P1 Space rack gear (N) 1 3 For ML3390 3PP4044-5156P1 Space rack gear (W) 1 3 For ML3391 25 4PB4025-3377P2 Rack tension spring 1 1 26 3PP4044-5008P1 Guide rail plate (N) 1[...]

B – 9 Figure 11-4 Carriage Assy 12 9 8 6 14 11 10 1 13 5 4 7-1 7-2 3[...]

B – 10 No. Part No. Description Q'ty Q'ty Remarks Required 1 4PP4044-5061G1 Carriage frame set 1 2 2 3 4PA4025-3718G1 Back up roller holder assy 1 2 4 4PP4025-3398P1 Guide roller 1 2 5 3PP4044-5065P1 Guide roller holder 1 2 6 4YA4044-5120G1 Space motor assy (24) 1 4 7-1 3PB4044-5506P1 Head cable (9N) 1 5 For ML3390 3PB4044-5507P1 Head c[...]

B – 11 Figure 11-5 Option Spare Parts 1 2 3 4 5 6 7 [Pull-Tractor] [Bottom-Tractor] [I/F Board][...]

B – 12 Figure 11-5 Option Spare Parts No. Part No. Description Q'ty Q'ty Remarks Required 1 4PA4025-3608G1 Pull and bottom 1 2 tractor assy (L) 2 4PA4025-3603G1 Pull and bottom 1 2 tractor assy (R) 3 2PP4128-1239G1 Tractor cover assy (N) 1 3 For ML3390 2PP4128-1243G1 Tractor cover assy (W) 1 3 For ML3391 4 1PA4128-1277G1 Bottom push sta[...]

APPENDIX C RS-232C Serial Interface Board (Option)[...]

C – 1 APPENDIX C RS-232C SERIAL INTERF ACE BOARD 1. GENERAL This section describes the operation of the RS-232C Serial Interface board installed in the Printer as an option using a start-stop synchronization and serial communications circuit. This serial interface board is capable of transmitting and receiving simultaneously at speeds up to 19,20[...]

C – 2 2. OPERA TION DESCRIPTION 2.1 Element Description (1) 80C51 with MASK ROM An eight-bit microprocessor controller that controls the following: (a.) Serial interface protocol and data transfer through a serial port. (b.) Message buffer. (c.) Transmission of parallel data to the printer. (2) SN75189 An RS-232C standard line receiver (3) SN7518[...]

C – 3 OCS P1 P2 P0 P3 TD RD IF WR LS245 2764  ROM  8 KB RD TD RAM  8 KB Driver +5 VD 10 VAC +5 V +9 V –9 V +5V 0V ±9 V power supply circuit Serial data control line Bus line Control line ADR latch Receiver DB0 to DB9 ADR/data bus ADR bus 80C51 RST CN1 Figure C-2-1 Block diagram[...]

C – 4 2.2.1 Operation at power on After power is turned on, an RST OUT signal is sent from the printer control board to reset the printer. When the reset is canceled, the 80C51 CPU performs initialization. Initialization consists of setting the 80C51 timer, and setting the serial mode. 2.2.2. RS-232C interface The DTR, SSD, TD and RTS signals out[...]

C – 5 Ready/Busy Received one character? Yes Is DSR valid? No Buffer overflow? Error? Parity error No error Store the received character in buffer. Is the printer in DESELECT state or is the paper low? No No Yes Yes No DSR High? Yes Store 40 H in buffer. Yes Yes No Yes Is remaining buffer space < 256? Yes No Turn on the SSD s[...]

C – 6 Figure C-2-3 X-ON, X-OFF Received one character? Yes Is DSR valid? No Buffer overflow? Error? Parity error No error Store the received character in buffer. Is the printer in DESELECT state or is the paper low? No No Yes Yes No DSR High? Yes Store 40 H in buffer. Yes Yes No Yes Is remaining buffer space < 256? Yes No Pri[...]

C – 7 3. TROUBLESHOOTING FLOWCHART 3.1 Before Repairing a Fault Before servicing the printer, ask the customer in what situation the trouble occurred and record the response. Before starting troubleshooting, operate the printer in the same situation as that at the time of trouble occurrence to see if the same trouble occurs again. If not, perform[...]

C – 8 1 The data is not received using a serial interface. (A protocol is set to READY/BUSY state, and BUSY LINE is in SSD + state.) Is the OSC oscillation waveform as specified in Figure C-3-1? No Replace the OSC. Yes Is a RST signal in Q3 is as specified in Figure C-3-2? No Check the RST circuit on the SRXC board. A Figure C-3-1 Figure C-3-2 V [...]

C – 9 Figure C-3-4 A Yes Are ALE, PSEN, RD, WR, signals as specified in Figure C-3-3? No Replace the Q3. Yes Are (T1) SELECT and (INTO) BUSY signals low level? No Check Q11 on the SKRA board. Yes Are +9V and -9V input to Q1? No Replace defective component in +9/–9 volt control circuit. Yes Is pin 1 SSD signal of Q3 High level? No Replace the Q3[...]

C – 10 Figure C-3-5 542ns 5V  0V 5V  0V WR    Q3-3 2 In receiving by serial interface, printing data is omitted or printing operation is not performed. Are RxD and SSD of Q3 as specified in Figure C-3-4? No Replace the Q2. Yes Are, WR, and BUS signals of Q3 pin 3 as specified in Figure C-3-5? No Replace the Q3. Yes Is the [...]

C – 11 3.3 Local Test 3.3.1 Circuit test mode 3.3.1.1 Setting (1) Diagnostic test (set by menu) (2) Test connector Connect the test connector shown in Figure C-3-6 to the interface connector Figure C-3-6 Test connector connection diagram 3.3.1.2 Function After the settings outlined in Section 3.3.1.1 are completed and power is turned on, the seri[...]

C – 12 (1) The program revision using two numerical characters is printed. (2) “LOOP TEST” is printed. (3) Memory is checked for the message buffer. (4) Prints “OK” is printed if the memory check is OK and “BAD” is printed if the memory check fails. (5) Output level to DTR, RTS, and SSD signals is dropped low. If DSR, CTS, or CD signa[...]

M-521369 4-96 Printed in Japan Oki Systems (Danmark) a.s. Park Alle 382 DK-2625 Vallensbaek Denmark Tel : 436 66500 Fax : 436 66590 Oki Systems (France) S.A. 44-50 Avenue du General de Gaulle 94240 L'Hay les Roses France Tel : 0146 158000 Fax : 0141 240040 Oki Systems (Italia) S.p.A. Centro Commerciale "II Girasole" PAT. Cellini-Lott[...]