¡ MICROLINE 3390/3391 PRINTER Maintenance Manual All specifications are subject to change without notice.
PREFACE 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.
TABLE OF CONTENTS 1. 2. CONFIGURATION 1.1 Standard Printer Configuration 1.2 Options THEORY OF OPERATION 2.1 2.2 3. 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 Supply Circuit Mechanical Operation 2.2.1 Printhead Mechanism and Operation 2.2.2 Spacing Operation 2.2.
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 Switch Lever 4. ADJUSTMENT 5. CLEANING AND LUBRICATION 6. 5.1 Cleaning 5.2 Lubrication TROUBLESHOOTING AND REPAIR 6.1 Items to Check Before Repair 6.
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1. CONFIGURATION 1.1.
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(3) Bottom push tractor unit (4) Roll paper stand (Narrow only) (5) Serial I/F • RS232C • RS422A • Current Loop 1–3
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2. THEORY OF OPERATION 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 board is supplied by the power board through the connector cord. The power to other electrical parts is also distributed through the connectors within the control board.
AI AC-input Vcc-Level TSD SEL-N 4 12.
(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.
(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. MPU RAM 1 (Q3) A0~A7 P03 CS1 RAM 2 (Q4) RAS CAS D0~D3 D4~D7 OE RD Clockout* T1 T2 T3 A0~A7 CS1~CS4 RD D0~D7 (Read) WRH WRL D0~D7 (Write) 8-bit bus, byte instruction * Clockout is provided when the original excitation is selected.
(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.
(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.
(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. MPU LSI A/D bus P07 ALE RD RDN WRL WRL P01 LSIC Clockout* A0~A19 LSICS ALE D0~D15 (Read) Address Data RD D0~D15 (Write) Address Data WRL * Clockout is provided when the original excitation is selected.
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 MPU via LSIRST-N. Reset operation by I-PRIME starts program to initialize, but does not reset the MPU.
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 data reception. The data is read upon receiving the RD-N signal from the MPU.
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 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 Circuit.”) (c) Pin stroke compensation Platen Print Head Pin 1~4 As shown in the drawing left, the stroke length up to the platen is different for each pin.
(e) Print mode compensation According to the thickness of the printing medium, the print mode is compensated as shown in the table below: Head Gap Range Print speed Drive time 1 2 3 4 5 100% 95% 85% 85% 80% Short Long (Drive time lengthens at each step.
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 the slit encoder included in the space motor.
(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.
(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.
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 OPTD OPCK OPTXD 77 OPCLK 78 OPCLR-N NPA2 80 OPRXD OPRD 79 Command and Data latch LED Driver +5V Switch controller A 2-byte (15 bits + 1 even parity bit) command (OPTXD) is transmitted to the LSI (BU5148S) in synchronization with the OPCLK signal.
2 – 17 6 5 NO Instruction for retransmission Error notification 4 8 7 Reset within BU5148S OPCLR-N OPRXD OPCLK bit0 bit0 Note Command response (first) Command (first) 2 bit7 bit7 3 Command response (second) Command (second) 2 31 6 7 5 or 8 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.
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 secondary coil (40V) of the transformer to be short-circuited, causing an overcurrent to flow through the primary coil and making the AC fuse (transformer ASS) open.
(3) Head overheat alarm The voltage of the output TSD signal of the thermistors, one of which is contained in the print head and the other in the print head driver, is monitored by the CPU/AD port to control the voltage Temp Stop 119°C Mode up α°C ß°C Mode down Mode and print control 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 (7) Stop 1.
2.1.9 Power Supply Circuit This power supply circuit supplies the +5VDC, +8VDC, +40VDC, 10VAC. Control Board SW Fuse Noise filter circuit Transformer Rectifier +40V Rectifier +8V Regulation Circuit +5V AC10V The uses of output voltages and signals are described below.
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.
(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 the coil.
Paper Print wire Printhead Platen (1) When printing Paper Armature assembly Print wire Thermistor Wire guide Yoke Spacer Magnet assembly (2) When not printing Paper Figure 2-3 2 – 23
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.
Print Head Carriage shaft Space rack Carriage frame Encoder disk Encoder sensor Motor gear Slider Guide rail Figure 2-4 2 – 25
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 pushed down, the adjusting screw can be turned with a screw driver to change the coarse gap adjustment.
Platen Range 1 Carriage shaft 2 3 Printhead 4 5 Adjusting lever Adjusting screw Idler gear Range from 5 to Adjusting gear 1 Narrows Printhead Adjusting screw Adjusting cam C.C.W. Platen Guide rail Widens Range from 1 to 5 C.W.
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: (1) (a) Ribbon drive gear assembly (b) Ribbon gear (space motor) (c) Ribbon cartridge Ribbon cartridge An endless ribbon with a single direction feed is used. Ink is supplied from an ink tank, which is built in to the ribbon cartridge.
Ribbon cartridge Drive gear Ink tank Figure 2-6 2 – 29
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.
(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 (R) is transmitted to the idle gear by setting the change lever to the TOP position.
(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 bottom switch, to confirm to the control board that you are in the continuous sheet mode.
Control Power supply Assy Bottom switch Switch lever Change gear shaft Rear switch Change lever Release shaft Change arm TOP Platen REAR BOTTOM Change lever Tractor gear Change gear Platen gear (R) Reset spring Idle gear (Bottom tractor unit) Figure 2-8 2 – 33
(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, while disengaging the push tractor.
(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.
(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 the pull tractor. Sheets are fed by these two tractors at the same time.
(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 the drive gear, and continuous sheet forms are fed by the pull tractor being rotated through the sheet feeder shaft.
(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 push tractor, and the sheet of paper is fed in to the print start position.
(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 pressure roller.
TOP Change lever Release cam Platen Change arm BOTTOM REAR Figure 2-14 2 – 40
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 sensor to detect that the sheet is provided.
Paper end sensor Sensor lever A Shaded portion Paper end lever B Bottom paper end lever Figure 2-15 2 – 42
(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 sheet, and continues uni-directionally until the front end of the sheet gets to the inside of the pull up roller cover.
Platen Ribbon protector Printhead Carriage frame assembly Figure 2-16 2 – 44
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 paper shoot. 3) After the lapse of time selected by the “wait time” in the menu, the LF motor starts its operation to feed the sheet of paper up to the print position.
(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 is fed in up to the TOF position (Factory default: 0.35 inches from the top). Push down the “FF/LOAD” switch.
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) The paper is fed in reverse, to leave the paper on the push-tractor or bottom-tractor. PARK Paper end detection PE LF action Reverse LF from P.E.
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3. ASSEMBLY/DISASSEMBLY 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 cable and the interface cable before disassembling or assembling. (a) Turn off the AC power switch. Remove the AC input plug of the AC cable from the receptacle.
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 No. Service Tool Q’ty Use 1 No. 1-100 Phillips screwdriver 1 Screws 2.6 mm 2 No. 2-200 Phillips screwdriver 1 Screws 3-5 mm 3 No. 3-100 screwdriver 1 4 Spring hook 1 5 J-YX4025–83335-3 1 6 Volt/ohmmeter 1 7 Feeler gauge 1 8 Pliers 1 9 No. 5 nippers 1 1.
3.3 Disassembly/Reassembly Procedure This section explains the assembly replacement procedures according to the following disassembly system.
[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 3.3.11 3.3.8 Space rack 3.3.9 Carriage cable 3.3.10 Back-up roller holder assy Platen assy 3.3.19 3.3.12 Space motor and guide roller assy Paper pan Driver board (SRXD) 3.3.13 3.3.
3.3.1 Printhead (1) Open the access over. (2) Pull up and rotate the head clamp (3) Disconnect the printhead (4) To install, follow the removal steps in the reverse order. 2 1 to unclamp the printhead from PC connector 2 as shown fig. 3.3.1. 3. Notes on installation: (1) Insert the printhead 2 into the PC connector 3 while pushing it against the carriage frame 4. (2) The head clamp 1 must surely be sandwiched between printhead as shown fig. 3.3.2.
3.3.2 Ribbon Protector (1) Remove the printhead (see 3.3.1). (2) Open the pull-up roller cover (3) Raise and remove the ribbon protector (4) To install, follow the removal steps in the reverse order. 1. 2.
3.3.3 Pull-up Roller Assy (1) Open the access cover (2) Lift up the sheet guide Assy 1. 4 to remove. Note: Please do after always removing the sheet guide Assy Assy 2 is installed and removed. (3) Tilting the pull-up roller Assy 2 4 when the pull-up roller toward the front, remove from the shaft of platen Assy 3. (4) To install, follow the removal steps in the reverse order.
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 (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 and shift toward the rear to disengage claws (6 places) (5 places for narrow type) of frame.
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 disengagement. (6) Remove the gear case Assy 3 in upper direction and release the carriage cable from the cable clamp of the gear case Assy.
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 (5) To install, follow the removal steps in the reverse order. 1 from the space motor Assy 2. Note on installation: (1) Do not touch the space motor 2 or terminals of PC connector dust or foreign matters. (2) After installation, check and adjust the gap between platen and printhead (see 4-1). 1 2 3 – 10 1.
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 (6) To install, follow the removal steps in the reverse order. 2, then the guide roller Assy 3 from the space motor 1. Notes on installation: (1) (2) Do not touch the terminals of space motor matters. When installing the guide roller Assy 3, 1.
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 (6) Disengage the claw on left side of space rack rack 2 in upper direction. (7) To install, follow the removal steps in the reverse order. 1.
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) (7) Remove two screws 1, release the driver board 2 and PCB sheet and disconnect cable from connector 3, 4, 5, 6. Remove carriage cable 7 from fasteners on frame. (8) To install, follow the removal steps in the reverse order.
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 backup roller holder assy 3. (6) 1, and remove the To install, follow the removal steps in the reverse order.
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 (6) Push in the lock levers 2 on both sides to unlock from the frame, then rotate them upward by 90°. (7) Remove the platen Assy (8) To install, follow the removal steps in the reverse order. 1 to the bottom position. 4 from base frame.
3.3.12 Driver Board (SRXD) (1) (2) Remove the upper cover (see 3.3.4 (1) – (5)). 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 2 3 between sensor when installing the driver board 2.
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 (8) Release the lock A to remove the LF motor (9) To install, follow the removal steps in the reverse order. 1. 2.
3.3.14 Operation Panel PCB (LEOP) (1) Remove the upper cover (see 3.3.4 (1) – (5)). (2) Disconnect the cable (3) Disengage claws on both sides from the frame, and remove the operation panel (4) 1 from connector 3 of Driver board Open claws (8 places) and remove the operation panel PCB 4. (5) 2. To install, follow the removal steps in the reverse order. 5 2 3 4 1 3 – 18 5 4.
3.3.15 Control/Power Supply Board (SRXC) (1) (2) Remove the upper cover (see 3.3.4 (1) – (5)). Disconnect two flexible cable 3 from the connector 2 the Control/Power Supply Board 1. (3) Remove the cable from the connector (4) Remove two screws (5) To install, follow the removal steps in the reverse order. 5 6, on the Control/Power Supply board 4 and remove the Control/Power Supply Board 1. 1.
3.3.16 Transformer Assy (1) Remove the upper cover (see 3.3.4 (1) – (5)). (2) Remove AC inlet (3) Disconnect the cable (4) Remove a screw (5) Remove two screws 1 6 and AC switch 3 2 from the frame guide. from the connector 4 on the Control/Power Supply Board and disconnect ground cable 8 7. and shift the transformer Assy 9 to the left and remove it. 6 1 8 7 2 9 3 5 4 3 – 20 5.
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 remove the change lever 3. (4) To perform mounting, follow the reverse procedure of removal. 6 with a flatblade screw driver to Remark on assembly: (1) To insert the change lever into the Change Gear Shaft 4 6, match the flat surface (D cut).
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 (5) To perform mounting, follow the reverse procedure of removal. 1 to the left side (in the direction of the arrow) to remove. Note on installation: (1) After installation, check and adjust the gap between platen and printhead (see 4-1).
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 (7) Lift up the paper chute assy (8) To perform mounting, follow the reverse procedure of removal. A . 1 and remove.
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 (7) Shift the drive shaft (8) To perform mounting, follow the reverse procedure of removal. 2 1. to the right side to remove (in the direction of the arrow).
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 (5) Rotate the release shaft 2 1. and move it to the left to detach the release shaft 2. Match the Main Frame Rib A with the protrusion B of the Release Shaft. (6) Remove rear pressure SP assy 3. (7) To install, follow the removal step in the reverse order.
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 assembly: (1) At the time of the Switch Lever assembly, make sure that the Micro switch on the Main Board works properly.
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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.
No. Item Specification Drawing Adjustment method It shall be measured at 3 points: the left end, the center and the right end of the platen. 4–1–1 Gap between the platen and the print head 1) Parallelism justment adVariation of value at the left, the center and the right shall be less than 0.02 mm Adjustment method After adjustment, mark the adjust composition with a red pen. Left Right (2) Set the adjust lever at the Range: 1.
No. Item Specification Drawing Adjustment method Note 1) The head gap shall be measured with the change lever set to rear position. Adjust lever A Note 2) The head gap shall be measured positioning the platen gear (R) craw on the top. Adjust gear Adjust spring Adjust screw B C Click of platen gear R Print head Gap Adjust lever Adjust gear Platen Adjust cam 4–1–2 Measure variation of G a p = 0 . 7 1 gap when range is ±0.05 at the changed. range 5.
No. Item Specification Drawing Adjustment method Gap between the con- 0.3mm or more tact and the monitor Confirm followings. Make sure that the gap between the contact and the motor PCB is 0.3 mm or more. Adjust lever 0.3mm or more Contact Motor PCB At the time of printing test, make sure that the contact touches the motor PCB and it becomes reduced speed mode when the adjust lever is set to range 2 and 4.
No. Item Specification 4–2 Gap between the platen and the paper pan 1±0.5 Drawing Adjustment method Confirm followings. (1) When the change lever is set at Friction position, the gap between the platen and the paper pan at the Bottom rear side shall be 1±0.5mm. Change lever Rear Platen 5 0. 1± n) tio ric tf (A 5 0. 1± r, ea m ) (R otto ion B osit p Paper pan (2) When the change lever is set at Rear or Bottom position, the gap between the platen and the paper pan at the front side shall be 1±0.
No. Item Specification Drawing 4–4–1 Rotation of the push tractor Adjustment method To confirm: The tractor gear shall rotate smoothly when the change lever is set at Friction position. Change lever (Center friction) Push tractor Tractor gear Slight backlash 4–4–2 Backlash between gears Approx. 0.05 to 0.11 mm To confirm: There shall be slight backlash between gears to allow smooth rotation of gears. (Backlash 0.05 to 0.
No. Item Specification Drawing Adjustment method 4–5–1 Ribbon feed To confirm: Ribbon shall be fed smoothly when the carriage is moved from side to side. Ribbon feeding 4–5–2 Running load to spac- 250g or less ing mechanism without a ribbon cartridge Ribbon Load measurement portion Ribbon cartridge 4–7 To confirm: Make sure that the power is turned off at the time of measurement.
No. Item Specification 4–6 Engagement of the double gear and the LF motor idle gear of the Platen Assy. Drawing Adjustment method To confirm: LF Motor idle gear Platen gear (L) 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 the bias gear and not locked.
5.
5. CLEANING AND LUBRICATION 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 When the equipment operating time has reached six months or 300 hours, whichever comes first.
Carriage shaft 5–2
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 will not fall inside of the machine. • Cleaning period: 6 months of operation or 300 hours of operation, whichever the earlier.
6.
6. TROUBLESHOOTING AND REPAIR 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: Check the trouble status according to Table 6.1 for the details of the trouble. Then, locate the trouble position according to the detailed flowchart. (5) 6.
6.3 Lamp Display (1) Printer mode display Table 6.2 LED CONDITION ALARM CATEGORY OPERATOR ALARM ALARM TROUBLE SHOOTING CONTENTS ALARM SEL MENU 10CPI 15CPI Paper end alarm ON OFF — — — Paper change lever alarm ON OFF — BLINK 1 OFF Paper jam alarm ON OFF — OFF Print Head thermal alarm OFF — BLINK 1 — — Print head temperature exceeds 119°C • Wait until it is cooled. • Replace P.H.
6–3 (3) WDT (Watch Dog Timeout) alarm EEPROM alarm CG ROM alarm MPU internal RAM alarm Program ROM alarm RAM on Control Board alarm ALARM I/F not mounted SERIAL ROM alarm INTERFACE RAM on I/F board ALARM alarm BRK instruction alarm MPU internal RAM alarm FIRMWARE DETECTION NMI signal alarm ALARM MAIN CONTROL ALARM ALARM CATEGORY Fatal Alarm ALARM 10 12 15 17 20 LED DISPLAY PROP Replace ROM or Control/Power Supply Board Replace Control/ Power Supply Board Replace Control/ Power Supply Bo
6–4 PRINT HEAD ALARM SPACING ALARM ALARM CATEGORY Print Head Gap A/D alarm Print Head A/D alarm Print Head homing alarm Spacing alarm ALARM ALARM 10 12 15 17 20 LED DISPLAY PROP Print Head Gap Signal open Thermister is open, short with 0V or short with +5V. Print head does not reach to the home position. Space IPT is not occurred within in specified timing. REMARKS : LED Blink (200ms ON, 200ms OFF) : LED Lights up UTILITY PRESTIGE BOLD Table 6.3 (2/2) • Replace P.H. cable.
6–5 Space motor Print head Operation panel board LF motor Driver board Transformer Switch AC connector Control/Power Supply Board Centro-connector
Connection Circuit Check for Printhead and SP/LF Motor Printhead Signal Connector pin number CN1 FG HD1 HD3 HD9 HO11 COM COM HD17 HD19 HD21 HD22 HD20 HD18 COM COM HD12 1 2 1 3 1 4 1 HD4 HD2 TH FG HD5 HD7 HD13 HD15 COM COM HD23 HD24 COM COM HD16 HD14 HD8 HD5 TH #1 #3 #3 2 #5 #5 2 5 1 #7 #7 2 6 1 7 #9 #9 2 8 1 #11 #11 2 9 10 1 #13 #13 2 11 1 12 #15 #15 2 1 13 #17 #17 2 14 1 #19 #19 2 15 1 #21 #21 2 16 1 HD10 #1 2 #23 17 #23 2 18 19 1 #2 #2 2 20 1 #4 #
(2) Line Feed Motor Resistance of each coil should be about 7.6Ω.
(3) Space Motor Resistance of each coil should be about 5Ω.
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 off, then on.) Remedied? No Yes End Replace carriage cable or ribbon feed mechanism.
No Yes Replace Driver Board. Driver Board Replace Transformer Assy. Remedied? No Yes CN2 20••••••••••••1 End Replace Control/Power Supply Board. Pin No. Signal 20 19 18 17 16 15 14 13 10 9 EP AC EL +8V +40V (F.
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.
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.
4 Paper jam while paper insertion Jam 1 Check the ribbon protector. Check the pull up roller cover is closed properly. Pull up roller cover Platen Paper Ribon Protector Jam 2 (wrinkled paper) 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.
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 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.
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.
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 gear. Set change lever to the rear position. Does the platen rotate smoothly? No Yes Replace tractor feed assembly. Replace LF motor assembly.
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.
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.
10-2 (RS232C I/F) Printer I/F pin assignment. Is the correct cable used? Yes TXD RXD SSD DTR DSR No Change I/F cable 2 3 11 20 6 pin, pin, pin, pin, 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.
Replace RS232C Board Remedied? No Yes End Replace Driver Board 6 – 21
APPENDIX A
APPENDIX A BIT IMAGE GRAPH IS — DOT DENSITY Single Double Double speed double density Double speed quad density 1/144 inch D 1/60 inch DOT D/2 1/120 inch DOT D/2 1/120 inch DOT D/4 1/240 inch DOT (No adjacent dots allowed) D = 1/60 inch APPENDIX A – 1
A. PCB LAYOUT 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) Short Plug Setting SP1 SP4 SP2 1 3 SP3 SP2 SP3 SP2 A SP1 B A B SP3 SP4 1 (2) Driver Board (SRXD) (3) Operation Panel Board (LEOP) A–1 3 Default 1 - 2: 4 Mbit EPROM 2 - 3: 1 M/2 Mbit EPROM 2-3 SP2 (A) - (B) and SP3 (A) - (B): To use program ROM of Q1.
APPENDIX B
B. SPARE PARTS 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 parts are ordered.
2 3 1 Figure 11-1 Upper Cover Assy B–2
Figure 11-1 Upper Cover Assy Q'ty Q'ty Required Remarks Upper cover (N) Upper cover (W) 1 1 2 2 For ML3390 For ML3391 1PA4094-7305G10 1PA4094-7308G11 Sheet guide assy (N) Sheet guide assy (W) 1 1 2 2 For ML3390 For ML3391 2PA4128-1237G1 2PA4128-1241G1 Access cover assy (N) Access cover assy (W) 1 1 2 2 For ML3390 For ML3391 No. Part No.
1 6 8 9 7 2 11 3 5 4 10 Figure 11-2 Printer General Assy B–4
Figure 11-2 Printer General Assy Q'ty Q'ty Required 1 1 4YA4042-1545G302 Control/Power supply board (SRXC) 1 9 3 4YA4042-1544G1 Driver board (SRXD) 1 9 4 4YA4042-1516G4 Operator panel board (LEOP) 1 3 5 3PP4044-5360G3 Operation panel 1 2 6 3YS4011-1266P1 AC cord 1 1 7 4YA4023-3101G1 Print head (24) 1 10 8 40085501 Fuse 23702.5 (125V 2.5A) Fuse 2151.25 (250V 1.
30 23 7 35 32 6 15 34 14 5 33 4 22 3 13 11 20 16 17 37 18 9 19 12 2 27 8 10 25 21 29 31 1 28 24 36 Figure 11-3 Printer Unit B–6 26
Figure 11-3 Printer Unit Q'ty Q'ty Required Remarks Main Frame (N) Main Frame (W) 1 1 2 2 For ML3390 For ML3391 3PP4044-5012P1 Bottom paper end lever 1 1 3 4PP4044-5019P2 4PP4044-5019P1 Pressure spring (F) Pressure spring (F) 3 5 2 4 For ML3390 For ML3391 4 4PP4044-5031P2 Roller holder (F) 3 5 6 8 For ML3390 For ML3391 5 4PA4025-3327G1 Front pressure roller assy 3 5 6 8 For ML3390 For ML3391 6 3PP4044-5015P1 3PP4044-5157P1 Release shaft (N) Release shaft (W) 1 1 2 2 For ML3
Figure 11-3 Printer Unit Q'ty Q'ty Required Remarks Platen assy (N) Platen assy (W) 1 1 3 3 For ML3390 For ML3391 3PP4044-5010P1 3PP4044-5156P1 Space rack gear (N) Space rack gear (W) 1 1 3 3 For ML3390 For ML3391 25 4PB4025-3377P2 Rack tension spring 1 1 26 3PP4044-5008P1 3PP4044-5155P1 Guide rail plate (N) Guide rail plate (W) 1 1 1 1 27 3PP4025-2810P1 Adjust cam 1 1 28 4PP4044-5009P1 4PP4044-5009P2 Carriage shaft (N) Carriage shaft (W) 1 1 1 1 29 3PP4044-5005P1 FG plate
9 12 8 6 10 14 11 5 1 4 13 3 7-1 7-2 Figure 11-4 Carriage Assy B–9
Figure 11-4 Carriage Option Assy Q'ty Q'ty Required Carriage frame set 1 2 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 3PB4044-5507P1 Head cable (9N) Head cable (9W) 1 1 5 5 For ML3390 For ML3391 7-2 3PB4044-5508P1 3PB4044-5509P1 Head cable (24N) Head cable (24W) 1 1 5 5 For ML3390 For ML3391 8 3PB4025-1241P1 PC connector (36/40) 1
[Pull-Tractor] 2 1 3 [Bottom-Tractor] 5 4 6 [I/F Board] 7 Figure 11-5 Option Spare Parts B – 11
Figure 11-5 Option Spare Parts Q'ty Q'ty Required Pull and bottom tractor assy (L) 1 2 4PA4025-3603G1 Pull and bottom tractor assy (R) 1 2 3 2PP4128-1239G1 2PP4128-1243G1 Tractor cover assy (N) Tractor cover assy (W) 1 1 3 3 4 1PA4128-1277G1 Bottom push stand (L) 1 2 5 1PA4128-1277G2 Bottom push stand (R) 1 2 6 4PP4094-7385G1 4PP4094-7386G1 Paper knife (N) Paper knife (W) 1 1 1 1 7 4YA4021-1050G1 LXHI-PCB (RS232 I/F) 1 3 No. Part No.
APPENDIX C RS-232C Serial Interface Board (Option)
APPENDIX C RS-232C SERIAL INTERFACE 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 19,200 bits per second. Two protocols are available: printer Ready/Busy and X-ON/X-OFF modes.
2. OPERATION 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) SN75188 An RS-232C standard line driver. (4) 2764 An 8 kbyte ROM that contains the serial interface control program.
80C51 Driver P1 TD P0 TD P3 P2 RST ADR latch RD RD IF WR Receiver OCS CN1 2764 LS245 DB0 to DB9 ROM ADR bus ADR/data bus 8 KB RAM 8 KB +5 VD 10 VAC +5 V ±9 V power supply circuit +9 V –9 V +5V 0V Figure C-2-1 Block diagram C–3 Serial data control line Bus line Control line
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 output by the 80C51 are converted to RS-232C signals by line driver SN75188 (Q1) and sent to the interface.
2.3 Communication Procedure Flowchart 2.3.1 Mode a Ready/Busy No Received one character? Yes Is DSR valid? Yes DSR High? No Yes Buffer overflow? Yes No Parity error Error? No error Store the received character in buffer. Is the printer in DESELECT state or is the paper low? Store 40 H in buffer. Yes No Is remaining buffer space < 256? No No Has 200 ms or 1s elapsed after SSD was turned on? Yes Turn off the SSD signal. Yes Printer busy? No Output one character from the buffer to printer.
2.3.2 Mode b X-ON, X-OFF No Received one character? Yes Is DSR valid? Yes No DSR High? No Yes Buffer overflow? Yes No Parity error Error? No error Store the received character in buffer. Store 40 H in buffer.
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 the printers self test and thoroughly test the printers functionality. If the trouble is reproducible proceed to the troubleshooting section. 3.
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? 90ns + 4 to + 5V V 0 to + 1V T (ns) Figure C-3-1 No Replace the OSC. Yes Is a RST signal in Q3 is as specified in Figure C-3-2? 5V 0V Figure C-3-2 No Check the RST circuit on the SRXC board.
A Yes Are ALE, PSEN, RD, WR, signals as specified in Figure C-3-3? 542ns 180ns ALE 5V 0V PSEN 5V 0V 271ns 542ns RD/WR 5V 0V 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.
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? 542ns 5V WR 0V 5V Q3-3 0V Figure C-3-5 No Replace the Q3. Yes Is the level of a BUS signals at Q7 pins 2-9 the same as that of DB0-7 when WR signal is started? No Replace the Q7. Yes Is 4 pin of Q6 identical to WR signal in Figure C-3-5? No Replace the Q6.
3.3 Local Test 3.3.1 Circuit test mode 3.3.1.1Setting (1) Diagnostic test (set by menu) (2) Test connector Connect the test connector shown in Figure C-3-6 to the interface connector TD RD RTS Equivalent to Cannon DB-25P CTS CD SSD DTR DSR 2 3 4 5 8 11 20 6 Figure C-3-6 Test connector connection diagram 3.3.1.2Function After the settings outlined in Section 3.3.1.1 are completed and power is turned on, the serial interface checks the message buffer memory and interface driver/receiver circuit.
(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 signals is High, “IF BAD” is printed. If DSR, CTS, and CD signals are all Low, “IF OK” is printed. (6) Output level to DTR, RTS, and SSD signals is raised high.
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