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DOT MATRIX PRINTER
NX-2415II
LC24-15II
TECHNICAL MANUAL
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DOT MATRIX PRINTER
NX-2415II LC24-15II
TECHNICAL MANUAL [ THIRD EDITION ]
NOTICE · All rights reserved. Reproduction of any part of this manual in any form whatsoever, without STAR's express permission is forbidden. · The contents of this manual are subject to change without notice. · All efforts have been made to ensure the accuracy of the contents of this manual at the time of going to press. However, should any errors be detected, STAR would greatly appreciate being informed of them. · The above notwithstanding, STAR can assume no responsibility for any errors in this manual.
© Copyright 1996 Star Micronics Co.,Ltd.
INTRODUCTION
This manual describes dot matrix printers as shown below. It is intended for use as a reference for periodic inspections and maintenance procedures. This manual is prepared for use at a technical level and not for the general user.
Model NX-2415II MULTI-FONT LC24-15II MULTI-FONT Destination For American and Asian market For European market
· This manual is divided into the following sections:
Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 General Specifications Theory of Operation Adjustments Parts Replacement Maintenance and Lubrication Troubleshooting Parts List
· First edition Second edition Third edition
: Oct. 1993 : Sep. 1995 : Apr. 1996
1 2 3 4 5 6 7
CHAPTER 1 GENERAL SPECIFICATIONS
1
1. 2. 3.
General Specifications ......................................................................................... 3 External Appearance and Composition .............................................................. 5 Control Panel ......................................................................................................... 6
3-1. 3-2. 3-3. Switch Combination Function ............................................................................... 6 Error Messages of LED ........................................................................................... 6 EDS Mode Settings ................................................................................................. 7
4.
Parallel Interface ................................................................................................... 9
4-1. 4-2. General Specifications ........................................................................................... 9 Connector Signals .................................................................................................. 9
5.
Serial Interface (option) ...................................................................................... 10
5-1. 5-2. 5-3. General Specifications ......................................................................................... 10 Connector Signal and Functional Descriptions ................................................ 10 DIP Switch Settings .............................................................................................. 11
6.
EE-PROM mode ................................................................................................... 12
6-1. 6-2. 6-3. 6-4. Outline .................................................................................................................... 12 Explanation of Special Control Codes ............................................................... 12 EE-PROM Map ....................................................................................................... 13 Rewriting the EE-PROM ........................................................................................ 16
GENERAL SPECIFICATIONS
2
GENERAL SPECIFICATIONS 1. General Specifications
Serial Impact Dot-matrix Pica Elite Semi-condensed 200 cps 240 cps 300 cps 67 cps 80 cps 100 cps Bi-directional, logic-seeking Uni-directional, logic-seeking (selectable) 24 pins 1/6, 1/8, n/60, n/70, n/180, n/216, n/360 inches Draft, Roman, Sanserif, Courier, Prestige, Script ASCII 96 International 16 sets (*) IBM special 111 IBM block graphic 50 IBM code page 6 sets (**) Download 256
Printing system Printing speed Draft Letter Quality Print direction
Print head Line spacing Font styles Characters
* USA, France, Gemany, England, Denmark I, Sweden, Italy, Spain I, Japan, Norway, Denmark II, Spain II, Latin America, Korea, Ireland, Legal ** #437 (USA), #850 (Multi-Lingual), #860 (Portuguese), #861 (Icelandic), #863 (Canadian French), #865 (Nordic)
Number of columns Pica (10 CPI) Elite (12 CPI) Semi-condensed (15 CPI) Condensed pica (17 CPI) Condensed elite (20 CPI) Proportional Character matrix Pica Elite Semi-condensed Condensed pica Condensed elite Proportional Bit image dot-matrix 8-pin normal (60 DPI) 8-pin double (120 DPI) 8-pin high-speed double (120 DPI)* 8-pin quadruple (240 DPI)* 8-pin CRT I (80 DPI) 8-pin CRT II (90 DPI) 24-pin normal (60 DPI) 24-pin double (120 DPI) 24-pin CRT III (90 DPI) 24-pin Triple (180 DPI) 24-pin Hex (360 DPI)*
136 163 204 233 272 Variable Draft 24 × 9 24 × 9 16 × 7 24 × 9 24 × 9 -- 8 × 816 8 × 1632 8 × 1632 8 × 3264 8 × 1088 8 × 1224 24 × 816 24 × 1632 24 × 1224 24 × 2448 24 × 4896
LQ 24 × 31 24 × 27 16 × 21 24 × 16 24 × 16 24 × n
* It is impossible to print adjacent dots in a mode marked with an asterisk (*).
3
GENERAL SPECIFICATIONS
Paper specifications Cut sheet Width Length Thickness Weight Fanfold (continuous) Width Length Thickness Weight Copies Maximum buffer size Emulations Standard mode IBM mode Interface Ribbon type Ribbon life Monochrome (Z24HD) Long life monochrome (LZ24HD) Dimensions and Weight Width Depth Height Weight Power supply Options
7.17" - 16.54" (182.0 - 420. 0 mm) 5.5" - 14.0" (139.7 - 355.6 mm) 0.08 - 0.12 mm 60 - 90 g/m2, 52 - 77 kg, 16 - 24 lb 4.0" - 16.0" (101.6 - 406.4 mm) Minimum 5.5" (139.7 mm) Single-ply paper 0.07 - 0.11 mm Total for multi-part forms 0.25 mm 52 - 82 g/m2, 45 - 70 kg, 14 - 22 lb Original +2 copies Without Download 40.0 kB With Download 256 Bytes Epson LQ-1060, NEC 24-wire Graphics commands IBM Proprinter XL24E Centronics parallel (standard) RS-232C serial (option) On-carriage, dedicated Monochrome (Black only) 3 million characters (draft pica) 4 million characters (draft pica) 590 mm (23.2") 332 mm (13.1") 127 mm (5.0") 7.65 kg (16.9 lb) 120VAC, 220VAC, 230VAC, 240VAC, 50/60 Hz (varies according to the country of purchase) Automatic Sheet Feeder (SF-15DJ) Pull Tractor Unit (PT-15XJ) Serial-Parallel Converter (SPC-8K)
Fig. 1-1 External dimensions 4
GENERAL SPECIFICATIONS 2. External Appearance and Composition
Fig. 1-2 Front View of the Printer
Fig. 1-3 Diagram of Internal Composition
5
GENERAL SPECIFICATIONS 3. Control Panel
3-1 Switch Combination Function
1) At power on
EDS mode
Aging mode
Hold
Dot Adjustment
DRAFT Roman Sanserif Courier Prestige Script
ALT
10CPI 12CPI 15CPI
MICRO FEED
POWER
QUIET
FONT
PROP COND
PITCH
SET/EJECT PARK
PAPER FEED
FF
ON LINE
MACRO
CLEAR
Font Lock
Pitch Lock
Print Area Test
Long Test
Short Test
Font & Pitch Lock
Hex. Dump
Fig. 1-4 Switch Combination Functions at Power-on 2) At off line
Top of Form Hold Push Reverse Micro-Feed Forward Micro-Feed
DRAFT Roman Sanserif Courier Prestige Script
10CPI 12CPI 15CPI
MICRO FEED
POWER
QUIET
FONT
PROP COND
ALT
PITCH
SET/EJECT PARK
PAPER FEED
FF
ON LINE
MACRO
CLEAR
Save Macro
Buffer Clear/All Reset
Form Feed
Fig. 1-5 Switch Combination Function at Off-line
3-2. Error Messages of LED
LED Indication "DRAFT" lamp blink "ROMAN" lamp blink "SCRIPT" lamp light "10 CPI" lamp blink "PROP" lamp light "COND" lamp blink Buzzer Sound 2 seconds, 1 time 2 seconds, 1 time 0.1 second, 1 time 2 seconds, 1 time 0.1 second, 1 time 2 seconds, 1 time Meaning Abnormal temperature error of printer head Carriage motor error at power on (including home position error) Software interrupt error (CPU error) EE-PROM and RAM check error Watch dog timer error (CPU error) Bail-lever error 6
GENERAL SPECIFICATIONS
3-3. EDS Mode Settings
The EDS mode in this printer has 16 functions that you can set as the power-on default settings. Turn the printer on while simultaneously holding down the SET/EJECT , PAPER FEED , and ON LINE buttons. You will hear an acknowledging beep as power comes on. This indicates that you have entered the EDS mode. In EDS mode, the buttons on the control panel are used as shown below in Figure 1-6.
DRAFT Roman Sanserif Courier Prestige Script
10CPI 12CPI 15CPI
MICRO FEED
POWER
QUIET
FONT
PROP COND
ALT
PITCH
SET/EJECT PARK
PAPER FEED
FF
ON LINE
MACRO
CLEAR
Select Bank
Select Switch
Exit
Print
Change Setting
Fig. 1-6 Button Functions in the EDS Mode. Bank-Switch A-1 A-2 A-3 A-4 A-5 B-1 B-2 B-3 B-4 B-5 C-1 C-2 C-3 C-4 C-5 D-1 D-2 Function Emulation AEC Mode RAM Usage Automatic Sheet Feeder Auto LF with CR Graphics Direction Paper-out Printable Area Strobe timing CR Centering Page Length Print Pitch Print Mode Character Table Standard mode IBM mode Code page or International Character Set LQ Font Selection (Reserved) (Reserved) ON Standard/Epson Enabled Input Buffer Not installed Disabled Bi-directional Enabled Type A Normal Disabled (See next page) (See next page) Letter Quality Graphics IBM #2 (See next page) Draft Italics IBM #1 OFF IBM Disabled Download buffer Installed Enabled Uni-directional Disabled Type B Reverse Enabled
D-3 D-4 D-5 E-1 E-2 E-3 E-4 E-5 NOTE:
(See next page) Leave ON Leave ON
The default is ON for all functions at purchase except B-1 and B-3 which are set to the OFF position. 7
GENERAL SPECIFICATIONS
Page Length 11 inches/Letter 8 inches 11.7 inches/A4 12 inches 8.5 inches 14 inches/Legal 10.5 inches/Executive 7.25 inches
C-1 ON OFF ON OFF ON OFF ON OFF
C-2 ON ON OFF OFF ON ON OFF OFF
C-3 ON ON ON ON OFF OFF OFF OFF
Print Pitch 10 CPI 12 CPI 15 CPI 17 CPI
C-4 ON ON OFF OFF
C-5 ON OFF ON OFF
When the EDS switch D-2 is set ON. Code Page #437 U.S.A. #850 Multi-lingual #860 Portuguese #861 Icelandic #863 Canadian French #865 Nordic D-3 ON OFF ON OFF ON OFF D-4 ON ON OFF OFF ON ON D-5 ON ON ON ON OFF OFF
When the EDS switch D-2 is set OFF. Country U.S.A. France Germany England Denmark I Sweden Italy Spain I Font Name Roman Sanserif Courier Prestige Script D-3 ON OFF ON OFF ON OFF ON OFF E-1 ON OFF ON OFF ON D-4 ON ON OFF OFF ON ON OFF OFF E-2 ON ON OFF OFF ON D-5 ON ON ON ON OFF OFF OFF OFF E-3 ON ON ON ON OFF
8
GENERAL SPECIFICATIONS 4. Parallel Interface
4-1. General Specifications
Item Synchronization System I/F Protocol Logic Level Specifications Via externally supplied STROBE pulses By ACK and BUSY signals Compatible with TTL level
ACK 5mS Data
t
t
t
t
STROBE (EDS B-4 : ON) STROBE (EDS B-4 : OFF) BUSY
Fig. 1-7 Timing Charts of Parallel Interface
4-2. Connector Signals
Pin No 1 2 3 4 5 6 7 8 9 10 11 12 13 14,15 16 17 18 19 ~ 30 31 32 33 34,35 36 Signal Name STROBE DATA0 DATA1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 ACK BUSY PAPER SELECT NC SIGNAL GND CHASSIS GND +5V GND RESET ERROR EXT GND NC SELECT IN Function Description Goes from high to low (for 0.5 µs) when active High when active High when active High when active High when active High when active High when active High when active High when active 5µs low pulse acknowledges receipt of data Low when printer ready to receive data. High when paper out. Can be disabled with EDS setting. High when printer is on-line Signal ground Chassis ground (isolated from signal ground) +5V DC output from printer Twisted pair ground return When this input signal is low, printer is reset Outputs low when printer cannot continue, due to an error External ground Always high 9
GENERAL SPECIFICATIONS 5. Serial Interface (option)
5-1. General Specifications
Item Interface Synchronization System Baud rate Word length Start bit: Data bit: Parity bit: Stop bit: Signal polarity Mark: Space: Handshaking Specifications RS-232C level Asynchronous 150-19,200 bit per second (BPS) [selectable] 150, 300, 600, 1200, 2400, 4800, 9600, 19200BPS 1 bit 7 or 8 bits (selectable) Odd, Even or None (selectable) More then 1 bit length Logic "1" (3V to 15V) Logic "0" (+3V to +15V) DTR XON/XOFF ETX/ACK 8KB (standard)
Data buffer
5-2. Connector Signal and Functional Descriptions
Pin No. 1 2 3 4 5 6 7 8 ~ 10 11 12 13 14 ~ 19 20 21 ~ 25 Signal name GND TXD RXD RTS CTS NC GND NC RCH NC GND NC DTR NC Direction -- OUT IN OUT -- Function Printer's chassis ground. This pin carries data from the printer. This pin carries data to the printer. Always space. This pin is Space when the computer is ready to send data. This printer does not check this pin. Unused. Signal ground. Unused. This printer turns this pin Space when it is ready to receive data. This line carries the same signal as pin 20. Unused. Signal ground. Unused. The printer turns this pin Space when it is ready to receive data. Unused.
--
OUT
-- OUT
10
GENERAL SPECIFICATIONS
5-3. DIP Switch Settings
Switch 1 2 3 4 5 6 7 8 ON 8 data bits No parity OFF 7 data bits Parity checked
Handshaking protocols - see table below Odd parity Even parity
Data transfer rate - see table below
All switches are set ON when the printer leaves the factory. Protocol DTR mode XON/XOFF mode ETX/ACK mode Baud rate 150 300 600 1200 2400 4800 9600 19200 Switch 6 OFF OFF OFF OFF ON ON ON ON Switch 3 ON ON OFF Switch 7 OFF OFF ON ON OFF OFF ON ON Switch 4 ON OFF ON Switch 8 OFF ON OFF ON OFF ON OFF ON
11
GENERAL SPECIFICATIONS 6. EE-PROM mode
6-1. Outline
These settings can be changed in the EE-PROM mode by writing data directly to the EE-PROM on the main logic board: s EDS (electric DIP switch) settings s Misalignment correction s Top margin in autoloading s Correction of the tear-off function s The EE-PROM mode for writing to the EE-PROM is designed for use by trained technicians, not for general users. s This mode is subject to change without notice. Setting EE-PROM mode s Send (09)H command. Canceling EE-PROM mode s Initialize the printer by sending @
6-2. Explanation of Special Control Codes
@ M@ Exits printer from EE-PROM mode and initializes the printer. Returns all data in the EE-PROM to the factory settings. After the buffer is cleared, the buzzer sounds. If the printer is powered off before the buzzer sounds, all data in the buffer is not cleared. If all data is not cleared from the buffer, operation is not guaranteed. Be sure to allow the buzzer to sound before you turn the printer off! Function Stores data into entire area of EE-PROM. Stores data (m) into the address (n) Stores auto-start software data into EE-PROM. Address 00H-7FH nH Capacity 128bytes 1byte
Code MW0 MW1nm MW2 MWn
· The data (m) used in the commands above are stored in the specified address in order (n). · When the data to be stored exceeds the specified caracity, subsequent data are ignored. · Data are stored in the EE-PROM according to the memory map. (See section 6-3.) · After all data are stored, a beep indicates the completion of storage. · If the printer is powered off during data storage, data stored before power off are valid, but subsequent operation of the printer is not guaranteed. Do not power off the printer while data is being stored! MR Dumps all data in the EE-PROM to a hard copy. For an example of using these control codes, see section 6-4. For the corresponding EE-PROM addresses, see the EE-PROM memory map in section 6-3.
12
GENERAL SPECIFICATIONS
6-3. EE-PROM Map
Address 00H Function EDS setting Bit b0 b1 b2 b3 b4 01H Function Emulation AEC mode RAM usage Auto Sheet Feeder Auto LF with CR 1 STANDARD/EPSON Enabled Input butter Not installed Disabled 0 IBM Disabled Download buffer Installed Enabled FAH 1 Bi-directional Enabled Type A Normal Disable 0 Uni-directional Disabled Type B Reverse Enable FFH b2 1 0 1 0 1 0 1 0 Page length 11"/Letter 8.5"/Letter 8" 14"/Legal 11.7"/A4 10.5"/Executive 12" 7.25"/Executive b3 1 1 0 0 b4 1 0 1 0 Print pitch 10CPI 12CPI 15CPI 17CPI Factory data FFH
EDS setting Bit b0 b1 b2 b3 b4 Function Graphics direction Paper-out Printable area Strobe timing CR Centering
02H
EDS setting b0 1 1 0 0 1 1 0 0 b1 1 1 1 1 0 0 0 0
03H
EDS setting Bit b0 b1 bit Function Print mode 1 LQ Draft 0
FFH
Character table 1: Graphics (Standard mode) Set #2 (IBM mode) 0: Italics (Standard mode) Set #1 (IBM mode)
13
GENERAL SPECIFICATIONS
Address 03H
Function In the italic character set b2 1 0 1 0 b3 1 1 0 0 b4 1 1 1 1 Country U.S.A. France Germany England b2 1 0 1 0 b3 1 1 0 0 b4 0 0 0 0 Country Denmark-1 Sweden Italy Spain-1
Factory data FFH
Except in the italic character set b2 1 0 1 0 04H b3 1 1 0 0 b4 1 1 1 1 IBM code page #437 #850 #860 #861 b2 1 0 1 0 b3 1 1 0 0 b4 0 0 0 0 IBM code page #863 #865 (Option-1) (Option-2) FFH Front Roman Sanserif Courier Prestige Script (Reserved) (Reserved) (Reserved) 60DPI 80DPI 120DPI 120DPI 180DPI 180DPI 240DPI 360DPI 60DPI 80DPI 120DPI 120DPI 180DPI 180DPI 240DPI 360DPI (Full dot) (Full dot) (Half dot) (Full dot) (Half dot) (Full dot) (Half dot) (Half dot) (Full dot) (Full dot) (Half dot) (Full dot) (Half dot) (Full dot) (Half dot) (Half dot) 08H 08H 08H 08H 08H 08H 08H 08H 08H 08H 08H 08H 08H 08H 08H 08H 00H, 00H, 00H
EDS setting LQ font selection b0 1 0 1 0 1 0 1 0 b1 1 1 0 0 1 1 0 0 b2 1 1 1 1 0 0 0 0 b3 1 1 1 1 1 1 1 1 b4 1 1 1 1 1 1 1 1
05H 06H 07H 08H 09H 0AH 0BH 0CH 0DH 0EH 0FH 10H 11H 12H 13H 14H 15H, 16H, 17H
Misalignment correction (1/720" pitch) Misalignment correction (1/720" pitch) Misalignment correction (1/720" pitch) Misalignment correction (1/720" pitch) Misalignment correction (1/720" pitch) Misalignment correction (1/720" pitch) Misalignment correction (1/720" pitch) Misalignment correction (1/720" pitch) Misalignment correction (1/720" pitch) Misalignment correction (1/720" pitch) Misalignment correction (1/720" pitch) Misalignment correction (1/720" pitch) Misalignment correction (1/720" pitch) Misalignment correction (1/720" pitch) Misalignment correction (1/720" pitch) Misalignment correction (1/720" pitch) Set macro area : Standard mode
First dot mode First dot mode First dot mode First dot mode First dot mode First dot mode First dot mode First dot mode
14
GENERAL SPECIFICATIONS
Address 18H 19H 1AH 1BH 1CH 1DH 1EH 1FH 20H 21H 22H 23H 24H 25H 26H 27H, 28H 29H, 2AH 2BH to 53H 54H to 7CH 7DH 7EH 7FH
Function Top margin in auto-loading : Standard mode : Tractor (Paper feed at a pitch of 1/360 of an inch) Top margin in auto-loading : Standard mode : Function (Paper feed at a pitch of 1/360 of an inch) Top margin in auto-loading : Standard mode : ASF (Paper feed at a pitch of 1/360 of an inch) Set marco area : IBM mode Top margin in auto-loading : IBM mode : Tractor (Paper feed at a pitch of 1/360 of an inch) Top margin in auto-loading : IBM mode : Friction (Paper feed at a pitch of 1/360 of an inch) Top margin in auto-loading : IBM mode : ASF (Paper feed at a pitch of 1/360 of an inch) Initial Conditions Area Correction of short-tear-off Auto-start software area : Standard mode (41bytes) Auto-start software area : IBM mode (41bytes) Not used Change FFH code (00H;NUL, others;DEL) Check code
Factory data 00H 00H 00H 00H 00H 00H 00H 00H 00H 00H 00H 00H 00H 00H 00H FFH, FFH 00H, 80H ALL 00H ALL 00H 00H 00H 10H
· Details of Misalignment Correction Address 05H to 14H Function Bidirectional test/adjustment mode (+/8 steps) Current 5:8/720 inch correction Current 4:7/720 inch correction Current 4:6/720 inch correction Current 3:5/720 inch correction Current 3:4/720 inch correction Current 2:3/720 inch correction Current 2:2/720 inch correction Current 1:1/720 inch correction Current 0:No correction Current +1:+1/720 inch correction Current +2:+2/720 inch correction Current +2:+3/720 inch correction Current +3:+4/720 inch correction Current +3:+5/720 inch correction Current +4:+6/720 inch correction Current +4:+7/720 inch correction Current +5:+8/720 inch correction Data (H) Factory data 08H
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10
15
GENERAL SPECIFICATIONS
6-4. Rewriting the EE-PROM
Follow this procedure to rewrite the EE-PROM. (1) Turn the printer on. (2) Load a BASIC disk in the computer. (3) Turn the computer on. (4) Set a sheet of paper in the printer, and press SET/EJECT. (5) Enter the program listed below and run the program. 10 LPRINT CHR$ (27) ; CHR$ (26) ; CHR$ (&H09) 20 LPRINT CHR$ (27) ; "MW1" ; CHR$ (&H03) ; CHR$ (&HFE) 30 LPRINT CHR$ (27) ; "MR" BASIC Program Code 10 LPRINT CHR$ (27); CHR$ (26);CHR$ (&H09) 20 LPRINT CHR$ (27);"MW1"; CHR$ (&H03); CHR$ (&HFE) 30 LPRINT CHR$ (27); "MR" (6) To complete the setting, turn the printer off. What It Does Enters the EE-PROM mode. Start rewriting the EE-PROM. Address data from &H03 will show EDS mode from the EE-PROM memory map. Data from &HFF to &HFE changes print quality from LQ to Draft. Dumps all EE-PROM data to hexadecimal.
16
CHAPTER 2 THEORY OF OPERATION
1. 2.
Block Diagram ..................................................................................................... 19 Main Logic Board ................................................................................................ 20
2-1. Data Input Operation ............................................................................................. 20
2
2-1-1. Parallel Interface ............................................................................................... 20 2-1-2. Serial Interface (option) .................................................................................... 21 2-2. General Flow Chart ............................................................................................... 24
2-2-1. Editing ............................................................................................................... 25 2-2-2. Print Head Driving Circuit ................................................................................ 25 2-2-3. Print Head Temperature Detection Circuit..................................................... 27 2-2-4. Carriage Motor Driving Circuit ........................................................................ 27 2-2-5. Carriage Motor Speed Control ........................................................................ 28 2-2-6. Paper Feed Motor Driving Circuit ................................................................... 29 2-3. 2-4. 2-5. Reset Circuit .......................................................................................................... 30 Reset by +5V Line Voltage Detection ................................................................. 31 Others .................................................................................................................... 31
3.
Power Supply Circuit .......................................................................................... 31
3-1. 3-2. 3-3. Noise Filter Circuit ................................................................................................ 32 Rectifier Circuit ..................................................................................................... 33 Ringing Choke Converter Circuit........................................................................ 33
4.
Mechanism ........................................................................................................... 34
4-1. Print Head Mechanism .......................................................................................... 34
4-1-1. Character Mechanism ...................................................................................... 34 4-1-2. Print Wire Drive Operation ............................................................................... 34 4-2. 4-3. 4-4. 4-5. Print Head Carrying Mechanism ......................................................................... 35 Ink Ribbon Feed Mechanism ................................................................................ 36 Paper Feed Mechanism ........................................................................................ 37 Detectors ............................................................................................................... 38
THEORY OF OPERATION
18
THEORY OF OPERATION 1. Block Diagram
The block diagram of this printer is shown in Fig. 2-1.
Data (From Host Computer) Print head Parallel interface Carriage motor
Driver
Lamp Switch Control panel board Masked ROM 256KB UVE-PROM 64 KB Power supply unit EE-PROM
Gate array
CPU Driver RAM
Detectors Paper feed motor
Automatic sheet feeder Printer mechanism
AC Power
Main logic board
Fig. 2-1 Block Diagram (1) Main Logic Board This board receives data from the host computer and stores it in the RAM in the order of arrival. The CPU on this board reads the data from the RAM, and edits it according to the program stored in the ROM. When the editing is completed, various drive signals from the CPU are sent to the printer mechanism to perform printing. 1 CPU TMP90C041 · Controls this printer. 2 UVE-PROM 27512 64K bytes · Contains the program which executes control of the printer. · For some version of the software, the UVE-PROM is not included. 3 Masked ROM 256K bytes · Contains the character font and the program. 4 EE-PROM BR93C46 64 × 16 bits · Contains the data (EDS data and so on) in the memory switch. 5 RAM, 64K bytes · Used as stack area, work area and data buffer of the CPU. 6 Parallel interface 7 Gate array (custom IC) · Inputs or outputs several signals. 8 Driver · The data edited by the CPU and gate array are sent to the printer mechanism after conversion to the signal for the print head drive and motor drives. Control Panel Board This panel circuit is for manual operation of the printer respectively. Printer Mechanism The printer mechanism consists of a print head, carriage motor, paper feed motor, ribbon feed motor and detectors. Power Supply Unit AC power is converted to 33VDC and 5VDC. 19
(2) (3) (4)
THEORY OF OPERATION 2. Main Logic Board
2-1. Data Input Operation
2-1-1. Parallel Interface Communications between the host computer and this printer are facilitated via parallel connectors. This section explains the handshake of this interface. The data input circuit of this interface is shown in Fig. 2-2.
CN7 D0 D1 D2 D3 D4 D5 D6 D7 RDB DECODER STBB STROBE INPUT BLOCK DECODER BSYB BUSY ACK ACK BUSY/ACK OUTPUT BLOCK WRB DECODER WR
DATA 0 DATA 1 DATA 2 DATA 3 DATA 4 DATA 5 DATA 6 DATA 7
8 BIT INPUT/ OUTPUT BLOCK
D0 D1 D2 D3 D4 D5 D6 D7 RD
STROBE
GATE ARRAY
CPU
Fig. 2-2 Data Input Circuit with Parallel Interface The following is an explanation of this handshake. (1) When the BUSY signal is LOW (Ready), the host computer outputs 8-bit data 0 through 7 to the connector CN7. The host computer carries the STROBE pulse signal to the printer. This signal is normally held HIGH by the host computer. When the host computer has data ready for the printer, it sets this signal to LOW for at least 0.5 µS. (2) The gate array of the main logic board reads data 0 through 7 at the time of STROBE signal fall, and then turns the BSYB signal to LOW. (3) When the BSYB signal of the gate array is set to LOW, the BUSY signal of connector CN7 will be turned to HIGH, notifying the host computer that data cannot be accepted. (4) The CPU is informed via the data line that the BSYB signal is LOW. The CPU then set the RD signal to LOW and read the data. (5) Upon completion of the data reading, the CPU notifies the host computer of the data receivable state by setting the BUSY signal of connector CN7 and the ACK signal to LOW. This concludes the explanation of the parallel interface handshake. The following chart shows the timing chart of the handshake.
20
THEORY OF OPERATION
ACK 5mS Data
t
t
t
t
STROBE (EDS B-4 : ON) STROBE (EDS B-4 : OFF) BUSY
Fig. 2-3 Timing Chart of Parallel Interface 2-1-2. Serial Interface (option) When the serial interface is used, an optional Serial Interface Board is required to be installed. The board will change the voltage level (RS-232C TTL) and the data transfer method (Serial parallel).
Fig. 2-4 Serial Interface
21
THEORY OF OPERATION
IC4 is a dual RS-232C driver/receiver which includes a capacitive voltage generator to supply RS-232C voltage levels from a single 5V supply. Data from the host computer is sent from RXD via IC4 and is input to the MPU. Serial data input to the MPU is converted into parallel data, and output to the main logic board. Conversely, parallel data received by the MPU is converted there into serial data, and output to the TXD terminal via IC4. The CTS terminal is hardware-connected, not software- connected. (This signal is not checked.) This printer employs 3 different transfer methods, which can be selected using the dip switches. (Refer to Chapter 1, 53 Setting Dip Switches) (1) DTR method The DTR signal is considered a BUSY signal at the handshake, and when the data buffer capacity is 256 bytes or less, the DTR signal is given a marked status, meaning it cannot receive data. When the capacity of the data buffer increases to 512 bytes or more during printing, the DTR signal is given a space status, which indicates that it can receive data. (2) XON/XOFF method When a handshake is carried out with the host computer, the XON/XOFF method makes use of ASCII codes (DC1) and (DC3). (DC1 and DC3 are called XON and XOFF, respectively.) When the printer buffer is full, DC3 (ASCII code 19) is output to the TXD terminal, and the computer receives a request to stop data transfer. The printer outputs DC3 until it (the computer) stops data transfer. During printing, when the buffer full status is cancelled and data can be received, DC1 (ASCII code 17) is output to the TXD terminal. When DC1 is output from the printer, the computer follows the data format, and begins data transfer. Data transfer will continue until DC3 is output again. (3) ETX/ACK method The data block is configured as shown below, but the initial STX code is not necessary. When an STX code is sent from the host computer, that 1 byte is ignored. When the ETX code is received, that 1 byte is not regarded as data, an ACK or NACK code is sent to the TXD terminal, and the host computer is informed that data reception has been completed. Data block form: STX DATA (8 KB or less) ETX
Fig. 2-5 Data Format
22
THEORY OF OPERATION
(1) DTR method
(2)
XON/XOFF method
(3)
ETX/ACK method
Fig. 2-6 Data Input Timing Chart with Serial Interface
23
THEORY OF OPERATION
2-2. General Flow Chart
A general flow chart of editing and printing operations is shown in Fig. 2-7.
POWER ON
Initialization
Ready State
Read Data
Control Code? YES Control Code Processing
NO
Data Storage
NO
Print?
(Line buffer determination)
YES Data Processing or Printing (Print out of data)
NO
Return?
YES
Return Action
Fig. 2-7 General Flow Chart of Editing and Printing 24
THEORY OF OPERATION
2-2-1. Editing Data stored in the RAM is read out sequentially by the CPU and then edited according to a function code that has been specified in advance. This editing takes places until the CR or CR + LF code appears or the line buffer becomes full. 2-2-2. Print Head Driving Circuit There are 24 needles on this print head, and each of these has a solenoid. Printing is carried out by turning the solenoids either ON or OFF. The circuit which drives the head solenoid HD1 is shown below.
t2 t2=226~258ms (Normal mode) t2=289~324ms (First dot mode) TR12 HCMN P83 A0 A1 A2 A3 D0 D1 D2 D3 D4 D5 D6 D7 WR CPU Gate array t1=300ms (Normal mode) t1=350ms (First dot mode) HDEN A0 A1 A2 A3 D0 D1 D2 D3 D4 D5 D6 D7 WR HD1 M-GND +33V TR13
HD1
TA2
HD1
M-GND t1 HD24 Ver.1,2
Fig. 2-8 Print Head Driving Circuit
t1
HD1 of gate array
t2
HCMN of gate array td=3ms
td=5ms td : Transistor's turn off delay time
Coil HD1
Fig. 2-9 Print Head Power On Timing Chart
25
THEORY OF OPERATION · Printing
[1]With the transistor TR13 of the head common drive and the head drive transistor TA2 set to ON, printing is begun when power reaches the head solenoid HD1. [2]Turn OFF TR13, and the energy stored in HD1 will pass TA2. [3]Turn OFF TA2, and the energy (60 volts above) stored in HD1 will be pass the zener diode, base and collector in the TA2. And transistor TA2 will turn ON. When the energy stored in HD1 is below 60 volts, TA2 will turn OFF. The process described above shows how one dot of printing is carried out. The length of time that the head solenoid HD1 receives power is controlled by the time that the head drive transistor TR13 operates.
VH(+33V)
[1]
TR13 D1
[2] [3]
M-GND TA2
HD1
M-GND
Fig. 2-10 Print Head Power on Timing Chart
· Head Energizing Control Circuit
The print energy of the print head is greatly influenced by the voltage applied to the solenoids and by the time that the current passes through. The head energizing control circuit holds this energy constant by controlling the head energizing period according to the voltage applied to the print solenoids. The figure below shows the head energizing control circuit. The applied voltage, VH, is divided between R109 and R110 and input to the CPU's analog input pin P52. The CPU compares the voltage input to P52 against the analog reference voltage, VREF, to find the value of VH. Then, it determines the head energizing period according to this voltage.
Head energizing period t2 (µs)
VH CPU ZD R109 P52 R110 258 237 226
Head energizing period t2 (µs)
[1] Normal mode
324 297 289
VREF
+5V
31.3 33.0 34.7 Head applied voltage VH(V)
31.3 33.0 34.7 Head applied voltage VH(V) [2] First dot mode
Fig. 2-11 Head Energizing Control Circuit 26
THEORY OF OPERATION
2-2-3. Print Head Temperature Detection Circuit The print head temperature detection circuit protects against damage when the print head heats up abnormally. Fig. 2-12 shows this circuit. The print head has a thermistor to show the temperature of the head solenoids. This thermistor is an element that converts temperature into voltage. Its output voltage is input to an analog pin of the CPU. The CPU compares this input voltage against its reference voltage Vref to find out the temperature of the head solenoids and carries out the following operations depending on the temperature. [1] T 130 °C (Text), T 100 °C (Graphics) Bi-directional printing [2] 130 °C < T < 135 °C (Text), 100 °C < T < 120 °C (Graphics) Unidirectional printing starts. When the temperature falls below, bidirectional printing resumes. [3] 135°C T (Text), 120 °C T (Graphics) The current line is printed, then printing stops. When the thermistor's temperature falls below, uni-directional printing resumes.
+5V +5V
VREF Thermistor P50 R83 CPU
Fig. 2-12 Print Head Temperature Detection Circuit 2-2-4. Carriage Motor Driving Circuit This printer employs a stepping motor as the carriage motor. Unlike regular motors on the market, this stepping motor will not operate just by connecting it to a power source. The motor operates only when a drive pulse is fed to it, but even then, it turns only a certain angle. This stepping motor is characterized by 4-phase stepping. Control of the motor is facilitated by phase 1-2 excitation. The following shows the carriage motor drive circuit and the control signal generated by the phase 1-2 excitation method.
+33V +5V
CN5 CRCMN1 CR1 TR23 TR21 D5 3
P60
P63
CPU
~
CR4 CRCMN2 TR22 +5V +5V
~
TR24 D6 4 TA7 5
TR17 TR18 TR19 TR20
Carriage motor 4 9 11 2 5 2 1 6 ø1 ø3 M
8 12 1
ø2 ø4
M-GND
Fig. 2-13 Carriage Motor Driving Circuit 27
THEORY OF OPERATION
Fig. 2-14 Carriage Motor Driving Signals The utilization of voltage applied to the carriage motor is described below: Voltage applied to the carriage motor is changed by setting the port CRCMN1 and the port CRCMN2 of the gate array Mode to HIGH or LOW and by turning transistor array TR23 Operation (TR24) ON or OFF. Standby When TR23 (TR24) is ON, +33V is supplied to the carriage motor and when TR23 (TR24) is OFF, +5V is supplied to the motor via diode D5, D6.
Voltage +33V +5V
Application Motor Drive Holding Bias
2-2-5. Carriage Motor Speed Control Since the carriage motor is a stepping motor, the carriage can be stopped at a desired position by controlling acceleration and deceleration. The carriage can also move backward. The rotational speed of the carriage motor is set by the number of pulses per time unit. The character pitch (horizontal character size) in each print mode is determined by changing this rotational speed (or carriage transfer speed). (1) At start-up of the motor: The number of pulses input to the motor increase in steps, reaching a certain frequency. (2) To stop the motor: The number of pulses input to the motor decreases in steps, in order to gradually bring the motor to a halt. (3) When printing is carried out: Pulses of a uniform pulse width are supplied for printing.
28
THEORY OF OPERATION
2-2-6. Paper Feed Motor Driving Circuit Again, a stepping motor is employed as the paper feed motor, which turns a certain angle only when a drive pulse is received. This 4-phase stepping motor is controlled by the phase 1-2 excitation method. The following is the description of the paper feed motor drive circuit and the control signal generated by the phase 1-2 excitation method.
+33V +5V CN8
D7 TR26 P33 CPU P70 P71 P72 P73 5 E M-GND TR25 B TA8 C 3 6 4
ø2 ø4 ø1
1 2 Paper feed motor
M
ø3
Fig. 2-15 Paper Feed Motor Driving Circuit
Fig. 2-16 Paper Feed Motor Driving Signals The utilization of voltage applied to the paper feed motor is described as follows. Mode Operation Standby: Voltage +33V +5V Application Motor Drive Holding Bias
Voltage to the paper feed motor is changed by setting CPU data P33 to HIGH or LOW and by turning transistor TR25 and transistor TR26 ON or OFF. When TR26 is turned on, +33V is applied to the paper feed motor. When TR26 is turned off, +5V is supplied to the motor via diode D7. 29
THEORY OF OPERATION
2-3. Reset Circuit
The RESET signal initializes the circuit elements and prevents operation errors when the power is turned on. The RESET signal is output for approx. 34ms. when the power is turned on, or while the RESET ( INPUT-PRIME ) signal is being output from the host computer.
+5V +5V CN7 +5V +5V 1 4 INPUT PRIME 22 C3 0.1mF Cd OUT 5 TR10 TR12 IC2 TR11 TR13 +33V
RES D0
HDCMN RES D0 HD1
M-GND
HD1
~
+33V +5V TR23 +5V
TA2
~
~
D7
D7 HD24 CRCMN1 CRCNM2 Gate arrray
M-GND
TR21 TA7 CRøA
P60 P63 Paper feed motor
~
TR17
M-GND
Fig. 2-17 Reset Circuit and Protection Circuit. · Power On Reset 1 When the power is turned on, the RESET signal output from Pin 5 of IC2 (M51953BL) for approx. 34 msec. This time length is determined by external capacitor C3 (0.1µF), and it can be calculated by the following formula. T = 0.34 × C10 (pF) µsec. 2 3 This LOW signal triggers RESET command to the CPU and the RESET terminal ( RES ) of the gate array. Resetting the CPU and the gate array will ignore all the drive signals for the carriage motor, the paper feed motor and the print head, preventing operation errors at power ON.
· Reset by Input Prime Signal from Host Computer 1 The input prime signal from the host computer is output to pin 22 of the connector CN7. 2 This signal inputs a low signal to the Cd pin of IC2. This in turn sets IC2's output pin low, triggering the same power on reset as described above.
30
THEORY OF OPERATION
2-4. Reset by +5V Line Voltage Detection
A voltage-detecting IC (IC2 in Fig.2-17) detects momentary drops in voltage or unstable voltage supply (due to power failures, etc.) on the +5V line. If the voltage on the +5V line falls below 4.25V, the RESET signal appears at the output terminal of the voltage-detecting IC.
Fig. 2-18 Equivalent Circuit of Voltage-Detecting IC
Fig. 2-19 Operational Timing Chart
2-5. Others
This CPU has a watch dog timer function, which is a timer that issues an interrupt if the CPU malfunctions (runs wild), for example due to noise. This interrupt tells the CPU that there has been a malfunction and it executes its malfunction program. (It cuts off the signals to the print head and the carriage motor, sets the ERROR signal low, etc.)
3.
Power Supply Circuit
A ringing choke converter type circuit is used with a dropper type circuit in the power supply unit, fulfilling the input and output conditions described in the chart below.
Voltage Range Input 120V AC 220V AC to 240V AC 5VDC ±2.5% 33VDC ±5% Maximum Current output 1.4A 0.7A 1.17A 2.86A Service Type of circuit
Output
For logic circuit drive, For motor holding For print head drive, For motor drive
Dropper Ringing choke converter
31
THEORY OF OPERATION
This circuit is shown in the block diagram below.
In rush current protection circuit
Input 120V AC 220VAC 240V AC
Noise filter circuit
Rectifier circuit
Switching section (Transistor Q1)
Ringing choke converter
Output DC33V
Dropper circuit Transformer PC1 Control circuit Photo-Coupler Voltage reference
Output DC5V
Fig. 2-20 Block Diagram of Power Supply Unit
3-1. Noise Filter Circuit
This circuit filters external noise that enters the AC power line. It consists of choke coils L1, L2, capacitors C1 ~ C4.
L1 L2 C2 C4 Input C1 Output
C3
Fig. 2-21 Noise Filter Circuit
32
THEORY OF OPERATION
3-2. Rectifier Circuit
This full wave rectifier circuit uses bridge diodes.
Input DB1
C6
Output
TH1
Fig. 2-22 Rectifier Circuit and Rush Current Protection Circuit The electrical current, shown by the dotted line and the single point broken line, is an AC current which alternates between positive and negative half-cycles, resulting in rectified current in both the positive and negative directions.
3-3. Ringing Choke Converter Circuit
D102
T1
VIN
LP
LS
C103
VOUT
Q1
Fig. 2-23 Ringing Choke Converter Circuit When the switching transistor Q1 is ON, the input voltage is applied to the primary coil (Lp) of the transformer T1. When this happens, the charge in the secondary coil (Ls) of the transformer is reversed so no current flows to diode D102. This results in an accumulation inside the transformer T1 of the all of the energy supplied to the primary coil. When the switching trasistor Q1 is OFF, the energy which accumulates in the transformer T1 is sent to the diode D102 and discharged on the output side. The electrical charge which builds up in the transformer T1 while the switching transistor Q1 is ON is equal to the charge output from the secondary side. This allows the output voltage VOUT to be kept constant by controlling the time the switching transistor is ON.
33
THEORY OF OPERATION 4. Mechanism
4-1. Print Head Mechanism
4-1-1. Character Mechanism The wiring arrangement of the guide section on the print head styles is depicted in Fig. 2-27. Odd- and even- numbered wires are arranged in two columns. This is a result of the necessity for laying adjacent dots on top of one another.
Fig. 2-24 Wiring Arrangement 4-1-2. Print Wire Drive Operation The print head consists of 24 needle wires and 24 print solenoids. The following explains how each needle wire operates during printing. (1) When the print solenoid is energized, the clapper is attracted by the iron core and the needle wire is driven toward the platen. (2) This needle wire hits the platen via the ink ribbon and paper. A single dot is printed on the paper. (3) When the print solenoid is de-energized, the needle wire is returned to its original position by rebound energy and spring and clapper holder (leaf spring) force.
Fig. 2-25 Outline of Print Head Mechanism 34
THEORY OF OPERATION
4-2. Print Head Carrying Mechanism
The print head carrying mechanism consists mainly of a carriage, timing belt, carriage motor, and home position detector. (1) Carriage The carriage is supported horizontally by means of the carriage stay and rear angle, and it moves from side to side with the print head mounted above it. A timing belt is clamped to the base of the carriage and a shield plate is mounted at the base for home position detection. (2) Timing Belt The timing belt is suspended between the timing pulley of the carriage motor and the timing pulley of the tension lever, and it maintains a constant tension. The timing belt is also clamped to the base of the carriage so that it can move the carriage accurately with driving force from the carriage motor. (3) Carriage Motor The carriage motor is a HB (Hybrid) type, four-phase and 192-pole pulse motor, which is driven by pulse signals from the control circuit. The rotational rate depends on the number of pulses per unit time. By varying this rotational rate (that is, the carriage carrying rate), the size of the horizontal letters can be changed in each print mode.
Fig. 2-26 Print Head Carrying Mechanism
35
THEORY OF OPERATION
4-3. Ink Ribbon Feed Mechanism
The ink ribbon feed mechanism is linked to the print head carrying mechanism described previously so that the ink ribbon is wound up automatically while the carriage moves left or right. The ribbon feed mechanism is driven by torque from the carriage motor, and carriage movement allows the idler gear to rotate. This rotation is conveyed sequentially to the gears that work to wind the ribbon. The carriage is equipped with a clutch lever so that the direction of cassette gear rotation remains constant regardless of the direction of the idler gear rotation.
Fig. 2-27 Ribbon Feed Mechanism
36
THEORY OF OPERATION
4-4. Paper Feed Mechanism
The paper feed motor is a PM (Permanent Magnet) type, four-phase and 48-pole pulse motor. Minimum paper feed is set at 1/360 inch. There are two ways of feeding paper available with this printer: Friction method and Tractor method. You can select one of the two methods, using the release lever. Position of release lever Linkage between tractor gear and tractor clutch Platen roller and holder roller Release lever position detector Paper feeding method (1) [1] Not Pressed Closed Friction [2] Linked Not Open Tractor
Friction Method Friction method is selected when the release lever is position [1]. With this method, paper is pressed between the platen roller and the holder roller; therefore, paper is fed as the rollers turn. As the paper feed motor is driven, the motor gear, through the idler gear, turns the platen gear in the paper feeding direction. However, since the tractor gear and the tractor clutch are not linked at this time, the tractor unit will not be driven. Tractor Method Tractor method is selected when the release lever is position [2]. Paper feeding is facilitated by rotation of the sprocket pin of the tractor unit. When the tractor method is selected, the tractor gear is linked to the tractor clutch, enabling the drive force generated by the paper feed motor to be transferred to the tractor unit via the idler gear and the platen gear.
(2)
Fig. 2-28 Paper Feed Mechanism 37
THEORY OF OPERATION
4-5. Detectors
(1) Home Position Detector A photo-interrupter is used in the home position detector, which is set at the left side of the frame unit. ON/OFF signals are generated according to the position of the shield plate mounted at the base of the carriage, and the printing position is determined by these signals. Paper Out Detector Paper out detector is located at the paper insertion slit. When paper is present, the photo transistor with the reflecting type photo sensor goes on. As soon as paper runs out, this transistor goes off, outputting a paper empty signal.
(2)
Fig. 2-29 Home Position Detector (3)
Fig. 2-30 Paper Out Detector
Bail Lever Position Detector The leaf switch is open when the bail roller is in contact with the platen roller, and it is closed when the bail roller is separated from the platen roller. Release Lever Position Detector The leaf switch is closed when the release lever is in the Friction position, and is open in the Tractor position.
(4)
Fig. 2-31 Bail Lever Position Detector
Fig. 2-32 Release Lever Position Detector
38
CHAPTER 3 ADJUSTMENTS
This printer has undergone various adjustments so that it will achieve standard performance. In this chapter, a brief explanation is given of the methods of adjustments. Please check this explanation when making maintenance inspections or when replacing parts to correct malfunctions.
1.
Gap Adjustment Between Print Head and Platen ............................................ 41
1-1. 1-2. Measuring Gap Between Print Head and Platen ............................................... 41 Adjusting Gap Between Print Head and Platen ................................................. 41
3
2. 3.
Adjustment of Timing Belt Tension ................................................................... 42 Adjustment of Home Position Detector ............................................................ 43
ADJUSTMENTS
40
ADJUSTMENTS 1. Gap Adjustment Between Print Head and Platen
1-1. Measuring Gap Between Print Head and Platen
(1) (2) (3) (4) (5) (6) (7) Remove the upper case unit according to procedures described in chapter 4. Set the adjustment lever [1] at step two. Remove the ribbon guide [2]. Insert a thickness gauge [3] between the print head [4] and the platen [5], and measure the gap. This measurement must be carried out at the left [L], center [C] and right [R]. The standard gap value is 0.28 to 0.35 mm. If the gap does not lie within this range,adjust it by following the procedure in item 1-2.
Fig. 3-1 Gap Adjustment
Fig. 3-2 Position of Adjustment Lever
Fig. 3-3 Gap Measurement
1-2. Adjusting Gap Between Print Head and Platen
If the gap does not lie within the standard range, adjust it by carrying out the following procedures. (1) Remove the printer mechanism according to the procedures described in chapter 4. (2) Loosen the nut [6]. (3) Insert the shaft in the ø2.5 hole [7]. Adjust the gap at the left by rotating the carriage stay [8] with the shaft. When the shaft is lowered to the platen side, the gap is reduced, and when lowered to the opposite side, the gap is expanded. (4) Next, hold the position of the shaft in the ø2.5 hole [7], rotate the right adjustment bush [9] , and adjust the gap at the right. (5) After adjusting, set the adjustment lever [1] to the position shown in Fig. 3-2 and tighten the nut [6]. (Note) When tightening the nut [6], make sure that the carriage stay [8] does not move. (6) Install the ribbon guide [2].
Fig. 3-4 Gap Adjustment
41
ADJUSTMENTS 2. Adjustment of Timing Belt Tension
The timing belt tension should be set at from 18g to 21g. (The belt tension must be measured with the designated tension gauge [1].) After the belt has been used for a long time, however, it may be difficult to maintain prescribed tension because of belt deterioration or wear. In these cases, make adjustments by following the procedures listed below. (1) Remove the upper case unit according to the procedures described in chapter 4. (2) Move the carriage unit [2] right and left two or three times in order to familiarize yourself with the timing belt [3]. (3) Set the adjustment lever [4] at step 2 as shown in Fig. 3-2. (4) Move the carriage unit [2] to the right end. (5) Set the arm [5] of the tension gauge [1] 206 mm a part from the frame L. (6) Move the tension gauge [1] in the opposite direction of the platen [6] until it stops. Then place the arm [5] of the tension gauge on the timing belt [3]. (7) Loosen the screw [7]. (8) Insert a flat-blade screwdriver into the square hole of frame and adjust the belt tension by moving the tension arm [8] left or right. (9) When the belt has been adjusted to the prescribed tension, tighten the setting screw [7]. (10) If the belt cannot be adjusted to the prescribed tension, replace it with a new timing belt [3].
Fig. 3-5 Adjustment of Timing Belt Tension
Fig. 3-6 Tension Measurement
42
ADJUSTMENTS 3.
(1) (2) (3) (4)
Adjustment of Home Position Detector
Remove the printer cover. Loosen the screw [1]. Set the projection [3] of the home position detector [2] between the two lines stamped. Tighten the screw [1].
Fig. 3-7 Adjustment of Home Position Detector
43
ADJUSTMENTS
44
CHAPTER 4 PARTS REPLACEMENT
This chapter explains disassembly and reassembly of the printer. Note the following precautions during disassembly and reassembly. 1. Disconnect the printer from the wall outlet before servicing it. 2. Assembly is the reverse of disassembly unless otherwise specified. 3. After reassembly, coat the screw heads with locking sealant. 4. Lubrication information is not provided in this chapter. Refer to item 2 in chapter 5.
1. 2. 3. 4. 5. 6. 7. 8. 9.
Upper Case Unit .................................................................................................. 47 Control Panel Board ........................................................................................... 47 Printer Mechanism .............................................................................................. 48 Main Logic Board ................................................................................................ 48 Power Supply Unit .............................................................................................. 49 Fuses ....................................................................................................................49 Print Head ............................................................................................................ 50 Paper Feed Motor Unit ........................................................................................ 50 Carriage Motor Unit ............................................................................................. 51
4
10. Bail Roller Shaft Unit .......................................................................................... 51 11. Platen Unit ........................................................................................................... 52 12. Tractor Unit .......................................................................................................... 52
PARTS REPLACEMENT
46
PARTS REPLACEMENT 1.
(1) (2)
Upper Case Unit
Turn off the power switch [1] Remove · Printer cover · Rear cover · Platen knob [2] · ROM cover [3] · Five tapping screws [4] Move the carriage unit [5] over the right so that it aligns with the cut-out of the upper case unit [6]. Remove · Upper case unit [6] Push the hook [7] of the lower case to separate the upper case unit [6] and lower case, next lean the upper case unit [6] forward for removal. · Cables [8] of control panel board
(3) (4)
2.
(1)
Control Panel Board
Remove · Upper case unit according to the procedure described in item 1. · Three tapping screws [1] · Control panel board [2]
47
PARTS REPLACEMENT 3.
(1)
Printer Mechanism
Remove · Upper case unit according to the procedure described in item 1. · Five tapping screws [1] · Screw [2] · Cable holder [3] Lift up the tab of the cable holder, and slide it to the left for removal. · Printer head cable [4] · Four connectors [5] · Printer mechanism [6]
4.
(1)
Main Logic Board
Remove · Printer mechanism according to the procedure described in item 3. · I/F cartridge unit [1] · Connector [2] · Four screws [3] · Screw [4] · Main logic board [5] Lift the hooks [6] on the right side fasting the main logic board, move the board right, lift the hooks [7] on the left side and remove the board.
48
PARTS REPLACEMENT 5.
(1)
Power Supply Unit
Remove · Upper case unit according to the procedure described in item 1. · Connector [1] · Four tapping screws [2] · Screw [3] · Screw [4] · Screw [5] · Power switch [6] · Power supply unit [7]
6.
(1)
Fuses
Remove · Upper case unit according to the procedure described in item 1. Inspect · Fuse F1 [1] Defective Replace fuse as follows: AC voltage 120V 220V to 240V F1 5TT3A 215 - 1.6A-250V
(2)
New fuse blown Inspect circuit
49
PARTS REPLACEMENT 7.
(1)
Print Head
Remove · Printer cover · Ink ribbon cartridge · Two tapping screws [1] · Print head [2] · Head cable [3] WARNING: The print head become hot after printing so wait for it to cool before removing it. Adjust · Gap between print head and platen. Refer to item 1 of Chapter 3.
(2)
8.
(1)
Paper Feed Motor Unit
Remove · Printer mechanism according to the procedure described in item 3. · Cord fastener binding the lead wires. · Connector [1] · Two screws [2] · Paper feed motor unit [3]
50
PARTS REPLACEMENT 9.
(1)
Carriage Motor Unit
Remove · Printer mechanism according to the procedure described in item 3. · Cord fastener binding the lead wires. · Connector [1] · Two screws [2] · Carriage motor unit [3] Adjust · Timing belt tension Refer to item 2 of Chapter 3.
(2)
10. Bail Roller Shaft Unit
(1) Remove · Upper case unit according to the procedure described in item 1. · Stop ring SE3 [1] · Spring [2] · Bail Lever L [3] · Bail roller shaft unit [4] Note : · Align the v mark on the bail lever L [3] with the q mark on the gear [5] to install the bail lever L 3.
51
PARTS REPLACEMENT 11. Platen Unit
Remove · Upper case unit according to the procedure described in item 1. (2) Move the bail lever [1] forward. (3) Remove · Two nuts [2] · Tractor stay [3] · Ground contact spring [4] · Platen holder R [5] · Platen holder L [6] Lift the tabs [7] of platen holders R and L to allow removal of platen holders R and L from the frame. · Platen unit [8] Caution in assembly: When assembling the platen gear assembly [9] on the idler gear, align the teeth of gear A and gear B (be sure to align the holes [10] in the two gears.) (4) Adjust · Gap between print head and platen. Refer to item 1 of chapter 3. (1)
12. Tractor Unit
(1) Remove · Platen unit according to the procedure described in item 11. · Stop ring [1] · Release lever [2] · Two nuts [3] · Two tractor bushings [4] Lift the tab [5] of the tractor bush to allow removal of the tractor bush from the frame. · Tractor unit [6] Caution in assembly: Aligen the mark () on the release lever [2], with the mark () on the release gear [7] to install the release lever [2].
52
CHAPTER 5 MAINTENANCE AND LUBRICATION
1.
Maintenance ........................................................................................................55
1-1. 1-2. Cleaning ................................................................................................................. 55 Checks ................................................................................................................... 55
2.
Lubrication ........................................................................................................... 56
2-1. 2-2. 2-3. Lubricant ................................................................................................................ 56 Lubricating Method ............................................................................................... 56 Lubricated Areas ................................................................................................... 56
5
54
MAINTENANCE AND LUBRICATION 1. Maintenance
In order to maintain the optimum performance of this printer and to prevent trouble, maintenance must be carried out according to the following items.
1-1. Cleaning
(1) Removal of dirt Wipe off dirt with a soft cloth soaked in alcohol or benzine. *Note: Do not use thinner, trichlene or ketone solvents because they may damage plastic parts. Also during cleaning, be careful not to moisten or damage electronic parts, wiring, or mechanical parts. Removal of dust, pile, etc. Vacuum cleaning (with an electric cleaner) is preferred. Remove all dust, etc., inside the printer. *Note: After cleaning, check the oil level. If it is not adequate due to cleaning, replenish it.
(2)
1-2. Checks
Checks must be carried out at two levels: "a daily check" which the operator can easily carry out during operation, and "periodic check" which an expert should carry out. (1) Daily check When the printer is used on a daily basis, check that the printer is used properly. Make sure that the printer is operating under the best conditions. · Is any paper stuck in the paper box or printer case? · Is the cartridge ribbon set at the right position? · Is there any foreign matter inside the printer? (Remove if any.) · Is the print head getting excessively dirty? (2) Periodic check After 6 months or printing 1 million lines, the periodic check and lubrication must be carried out. · Check for deformation of springs. · Check the gap between the platen and the print head. · Remove dust, dirt, etc., around the detectors.
55
MAINTENANCE AND LUBRICATION 2. Lubrication
Lubrication is very important to maintain optimum performance and to prevent trouble.
2-1. Lubricant
The type of lubricant greatly affects the performance and durability of the printer, especially in a low temperature environment. We recommend use of the grease and lubrication oils listed below for this printer. Product name FLOIL GB-TS-0 KF96-1000CS MOLYKOTE (R) EM-50L Mobil 1 Maker Kanto Chemicals Co., Ltd. Shinetsu Chemical Industry Dow Corning Corporation Mobil oil
2-2. Lubricating Method
When lubrication is carried out in assembly and disassembly, wash parts well to remove dust and dirt before lubrication. Lubrication must be carried out regularly once every 6 months or after 1 million lines have been printed. Lubrication is necessary irrespective of the regular lubrication whenever lubricant becomes deficient after cleaning or whenever parts have been disassembled or replaced.
2-3. Lubricated Areas
NO. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] Lubricating Point Rubbing surfaces of idler gear 16 × 60 × 0.5 and idler gear shaft A Rubbing surfaces of gear 40 × 0.5 and gear shaft Rubbing surfaces of tractor shaft and tractor bushing Rubbing surfaces of tractor shaft and release lever Rubbing surfaces of carriage stay and bushing 14 × 16 × 10 Rubbing surfaces of clutch shaft and gear 22 × 1.0 Rubbing surfaces of release shaft and roller holder Rubbing surfaces of roller holder and lower case Rubbing surfaces of ribbon cassette gear and carriage Rubbing surfaces of PF idler gear and shaft Rubbing surfaces of PF idler gear and shaft B 16 × 1 - 40 × 0.3 and carriage Rubbing surfaces of gear 48 × 0.3 and shaft Rubbing surfaces of idler gear 17 × 41 × 0.3 and gear shaft C Rubbing surfaces of pulley cap and pulley shaft Rubbing surfaces of timing pulley and stop ring Rubbing surfaces of tractor holder and tractor cover Rubbing surfaces of adjusting lever and frame Rubbing surfaces of idler gear 24 × 40 × 0.5 and gear shaft Rubbing surfaces of rear roller and shaft Rubbing surfaces of clutch shaft and bushing Rubbing surfaces of index lever and release lever Rubbing surfaces of release shaft and frame 56 Grease/Oil GB-TS-0 GB-TS-0 GB-TS-0 GB-TS-0 Mobil 1 KF96-1000CS GB-TS-0 GB-TS-0 GB-TS-0 GB-TS-0 GB-TS-0 GB-TS-0 GB-TS-0 GB-TS-0 GB-TS-0 KF96-1000CS EM-50L GB-TS-0 GB-TS-0 GB-TS-0 GB-TS-0 GB-TS-0
MAINTENANCE AND LUBRICATION
Fig. 5-1 Lubricated Areas 1
57
MAINTENANCE AND LUBRICATION
Fig. 5-2 Lubricated Areas 2 58
CHAPTER 6 TROUBLESHOOTING
TROUBLESHOOTING
1. 2. 3. 4.
Troubleshooting Procedures ............................................................................. 61 Unit Replacement Flow Chart ............................................................................ 62 Repair by Unit Replacement .............................................................................. 63 Repair by Parts Replacement ............................................................................ 69
4-1. 4-2. 4-3. 4-4. 4-5. Does not Operate at All with Power on .............................................................. 69 Power Supply Circuit Abnormal ......................................................................... 70 Defective Motor Operation ................................................................................... 71 Defective Print Head Operation .......................................................................... 72 Defective Parallel Interface Operation................................................................ 73
6
59
TROUBLESHOOTING
60
TROUBLESHOOTING 1. Troubleshooting Procedures
Troubleshooting is never easy because various problems arise depending upon the particular location of the breakdown, but the following procedures should be adhered to in making repairs. (1) At the first stage, conduct repairs through unit replacements. The two display codes appearing in the flow chart are defined as follows: 1) indicates main logic board replacement; and 2) indicates printer mechanism replacement, to be carried out if the problem has not been corrected. 1) 2) Main Logic Board Replacement Printer Mechanism Replacement
Check again at this time whether the replaced unit is malfunctioning. (This is done to rule out trouble caused by improper contact of connectors.) Replaceable units consist of the following: · Power supply unit · Main logic board · Printer mechanism · Control panel board In replacing these units, always refer to the unit replacement flow chart. (2) At the second stage, use the flow chart for repair by parts replacement to replace defective elements inside a particular unit. (Note 1) Before starting to repair, be sure to check visually the contact of the connector and the mounting of the IC in the IC socket. (Note 2) Always turn off power source