Maxim M190G, Technical Manual

Page 1: ...English technical manual impact dot matrix printer Model M190G ...

Page 2: ...90G if made in the future will bepublished which can be used in conjunction with this Manual The details in the contents of this Manual are subject to change without priornotice We shall not be responsible for any troubles that might occur from the application of this Manual by customer either to a machine other than this printer or to a drive circuit or other device that is the industrial propert...

Page 3: ... components such as the motor and magnets must be observed If the maximum time power can be applied or the maximum voltage that can be applied is exceed ed the components mentioned above could overheat and start a fire or begin to smoke 1 Motor The motor is DC brush motors which can be short circuited and must there fore be protected using a fuse that is properly matched to the power supply 2 Prin...

Page 4: ...2 2 Inspection 2 8 2 3 REPAIR 2 9 2 3 1 Repair Levels 2 9 2 3 2 Repairing Procedure 2 9 2 3 3 Repairing Guide 2 10 2 4 OILING 2 15 2 4 1 Oil Types 2 15 2 4 2 Oiling Standard 2 15 2 4 3 Oiling Points Refer to Fig 3 2 Overall oiling diagram 2 16 2 5 TOOLS AND OIL 2 18 2 5 1 Tool List 2 18 2 5 2 Oiling List 2 18 Chapter3 Disassembly and Reassembly 3 1 Disassembly 3 1 3 2 Assembly 3 1 Subassembly 1 3 ...

Page 5: ...ications including use with data collectors hand held type personalcomputersand calculators They have the following characteristics A simple and highly reliable print mechanism design A thin compact and light weight design Use of a compact light weight and highly reliable dot head which produces clear printing even for graphics Pressure sensitive copying capability one sheet original one copy One ...

Page 6: ...er 10 Type Normal paper Size 57 5 0 5 mm paper width 83 mm or less outside diameter 10 mm or more inside diameter Thickness 0 06 to 0 085 mm Weight 52 3 to 64 g m2 13 9 to 17 0 lbs 45 to 55 Kg 20 41 to 24 94 lbs 1000 sheets 1091 788mm 42 95 31 02 2 ply pressure sensitive paper Type No carbon paper Mitsubishi Seishi N40 Upper sheet Hi Lower sheet Blue color printing Size 1 Form for cut sheet type 5...

Page 7: ...ing detector Can be used with the same printer driver power supply MCBF 1 500 000 lines Reliability 12 Printer life 2 250 000 lines Environmentalconditionsfor 13 operating Operating ambient temperature a When using the ERC 22 10 to 50 14 to 122 F The assured temperature for printing is 0 to 50 C 32 to 122 F b When using the ERC 09 0 to 50 C 32 to 122 F Operating ambient humidity 10 to 90 RH non co...

Page 8: ... 5 0 VDC 25 C 77 F continuous printing Table 1 1 General Specifications Item No Model M190G 1 1 3 Overview of the Mechanism Section Model M190G is configured of the block mechanisms 1 the transmission mechanism 2 detector mechanism 3 print mechanism 4 paper feed mechanism and 5 ribbon feed mechanism Fig 1 1 illustrates the appearance of the Micro Dot Printer Model M190G The manual knob is equipped...

Page 9: ...ernal gear of the cam subunit Model M190G Technical Manual 1 2 OPERATION PRINCIPLE 1 2 1 Transmission Mechanism The transmission mechanism is structured of the reduction gear assembly paper feeding gear assembly and the ribbon feeding reduction gear assembly The individual gear assemblies are shown in Figs 1 2 to 1 4 Reduction gear assembly The reduction gear assembly consists of the Gear motor in...

Page 10: ...rrow a the bevel gear of the Ribbon feeding gear which engages with the ribbon driving gear rotates in the direction of arrow b As the small gear mounted on the Ribbon feeding gear engages with the spool gear assembly the ribbon feeding gear rotates causing the spool gear assembly to rotate in the direction of arrow c Figure 1 4 Ribbon Feeding Reduction Gear Assembly 1 2 2 Detector Mechanism The d...

Page 11: ... Timing signal T in dot line 1 is confirmed Resetting of the counting of Timing signal T is not performed until one character line or each printing cycle of a bit image is completed Figure 1 6 R detector Mechanism Motor assembly Detector plate Photo micro sensor Circuit board Circuit board assembly Photo interruptor Holder trigger yoke Cam trigger assembly Model M190G Technical Manual T detector m...

Page 12: ...m groove engraved on the outer circumference of the Cam trigger assembly When the Cam trigger set rotates in the direction of the arrow the head oscillating pin moves along the cam groove causing the head unit to move in parallel with the paper feeding platen unit Print operation of the head Movement of the print lever when printing 1 dot The print head is structured of a Coil head Iron core head ...

Page 13: ...he Push bar head is pulled toward the Iron core head in the direction of arrow a to press against the back of the Lever printing head 2 A s the base of the Lever printing head is supported by the printing lever shaft when the back of the Lever printing head is pressed the top end of the print lever is pushed out toward the paper feeding platen unit in the direction of arrow b centering on the prin...

Page 14: ...g Lever fast feeding Paper feeding lever Trigger lever Paper feeding platen unit Lever release etc This mechanism features normal paper feeding and fast feed functions It also features a paper free function Tn Pn 3 Pn Pn 3 Pn Pn 1 Pn 2 Pn 4 Pn 5 Pn 5 Pn 1 Pn 2 Pn 4 Pn 3 Pn Pn 4 Pn 1 Tn 5 Tn 4 Tn 3 Tn 2 Tn 1 Timing signal T Print solenoid A drive pulse Print solenoid B drive pulse Print solenoid C ...

Page 15: ...he cam paper feeding is caused to rotate in the direction of arrow a by the rotating of the Shaft can the inner cam mounted at the center of the Cam paper feeding the shaded section in the Fig below makes contact with the Lever fast feeding and the Cam paper feeding rotates Paper Paper feeding direction Trigger lever Cam paper feeding Paper feeding lever Lever release Gear paper feeding Gear paper...

Page 16: ...e trigger plate and the trigger lever is rotated in the direction of arrow e in Fig 1 13 Following this the trigger lever is released by the fast feeding lever and the fast feeding lever rotates in the direction of arrow f as shown in Figs 1 13 and 1 14 The top end of the fast feeding lever then disengages from the cam track the shaded section at the center of the paper feeding cam In this state t...

Page 17: ...eeding condition Refer to Fig 1 15 When the paper feeding lever is pulled in the direction of arrow a by the groove cam section of the Cam paper feeding the Gear paper feeding drive rotates in the direction of arrow e to mesh with the Gear paper feeding This causes the Gear paper feeding to rotate intermittently one or two teeth in the direction of arrow f and the Roller paper feeding mounted on t...

Page 18: ...rotates in reverse returning it to the home position Figure 1 16 Operation of Gear paper feeding drive and Gear paper feeding while Paper Feeding and Returning Paper free The Lever release is rotated in the direction of arrow a in the Fig 1 17 by cam A of the Cam paper feeding This causes the Gear paper feeding drive to slide in the direction of arrow b and disengage the Gear paper feeding drive f...

Page 19: ...arrow a in the figure below the ribbon feeding gear which matches up with the bevel gear and small gear rotates in the direction of arrow b in the Fig below Also the spool gear which engages with the ribbon a b c Cam A Cam Release lever shaft Gear paper feeding drive Gear paper feeding Lever release Model M190G Technical Manual This unit stops in the paper free state during the normal operation un...

Page 20: ... spool gear causes the ribbon feeding roller inside the ribbon cassette to engage with the spool gear shaft which rotates in the same direction as the spool gear to feed the ribbon Figure 1 18 Ribbon Feeding Mechanism a b c P U S H E J E C T Ribbon cassette Ink ribbon Ribbon drive gear Ribbon feeding gear Spool gear shaft Spool gear ...

Page 21: ...nter 2 Grasp the frame of the printer and the center of the printer cover then lift it 3 If the printer is transported by grasping he platen and the circuit board pay attention to the following matters Because the printer uses the electronic devices for reset and timing detection static electricity may cause the damage to the printer To protect against static electricity use one of the following m...

Page 22: ...eeding gear when you move the printer Figure 2 3 Portion not to be held 6 Do not subject the printer to strong impact shock or excessive external stress Precaution when the printer is temporarily set down When the printer is temporarily placed on a surface such as a desk do not let the printer terminals or either side of the printer contact anything P U S H E J E C T Ribbon drive gear P U S H E J ...

Page 23: ...ing storage 1 Avoid installing the unit in dusty or humid places and do not expose the unit to direct sunlight 2 When the unit is stored for long periods of time place the unit in an anti static electricity bag and wrap it with anti rust paper VCI and store it in a dry place P U S H E J E C T Paper feeding gear Model M190G Technical Manual Precautions when installing the case 1 To prevent the cams...

Page 24: ...r inserted in the unit or without the ink ribbon installed 3 Do not re ink the ribbon 4 Be sure to use the paper specified by the manufacturer Refer to 1 1 2 5 Be sure to use the ribbon cassette specified by the manufacturer 6 Do not operate the manual knob during printing or do not do anything to hinder rotation of the manual knob 2 1 2 Loading Paper Inserting paper Keep the following in mind whe...

Page 25: ... the methods below 1 Electrical operation Turn the power ON and press the paper feed key to feed the paper out 2 Remove the paper using the manual knob 3 Pull the paper slowly out of the paper delivery slot or paper insertion slot using the paper free mechanism Do not remove the paper by other methods than the ones above If you remove the paper by any other method it could cause a paper feeding er...

Page 26: ... cassette will come loose Then pull it up in the direction of the black arrow to remove it Figure 2 9 Removing the Ribbon Cassette II Installing the ribbon cassette 1 Be sure to use the ribbon cassette specified in the specification Ribbon cassettes other than the specified type can cause such problems as malfunction of the printer lever and lowering of print quality 2 It is recommended to install...

Page 27: ...ot bent or loose 2 1 4 Cleaning paper jams If a paper jam is occurred proceed as follows 1 Cut the paper on the paper insertion side 2 Remove the ribbon cassette 3 Pull out the paper from the paper delivery side with a tool such as tweezers 4 If there still remain unremovable pieces of paper inside of the printer remove them as follows P U S H E J E C T Ink ribbon P U S H E J E C T Knob Section A ...

Page 28: ...s Dust cloth particles and foreign particles on the unit should be vacuum cleaned Be sure to vacuum even in the smaller sections Notes 1 Do not use such liquids as thinners and solvents for cleaning because they may damage the plastic or rubber parts of the unit 2 After cleaning check the amount of oil present and add more oil if necessary 2 2 2 Inspection Maintenance and inspection for this unit ...

Page 29: ...6 of specification The ribbon and ribbon cassette must be free of damage Model M190G Technical Manual Periodic check Every six months periodic maintenance and inspection of the points below should be conducted Table 2 1 Periodic Check 2 3 REPAIR Repairs are classified into two levels A and B in consideration of the degree of difficulty of repairs Thus the person in charge of repair must decide the...

Page 30: ... arrangement diagram and Figs 1 19 and 1 20 Detailed timing signal T allocation for each model for easier check for repair 2 3 3 Repairing Guide Table 2 2 Repairing guide Level Cause Condition Phenomenon Check point and method Repair method 1 The motor does not ro tate Even if a print command is in put the motor does not rotate 1 Poor contact of mo tor lead A Check the continuity between the motor...

Page 31: ...esistance does not match with the rating replace the print head unit 5 Malfunction of Coil head B Check that the clamp shaft and print lever for the pertinent head operte smoothly When they do not op erate smoothly re place the print head unit 5 Intermittent dot missing Intermittent dot missing for cer tain head 1 Poor contact of Ca ble head A Refer to Phenome non 4 and Cause 2 When no continuity ...

Page 32: ... B Check that the hold ing spring for the Roller paper hold roller is not de formed Replace the paper feeding platen unit 8 Paper feeding pitch is not even Uneven line spacing or print ed letter is blurred 1 Improper paper feeding A Refer to Phenome non 7 and Cause 1 Use the specified pa per 2 The cam in the Cam paper feeding is worn B Refer to Phenomenon 7 and Cause 3 3 The Paper feeding platen u...

Page 33: ...is worn Replace the paper feeding cam 10 The paper free function can not be set Prints normally but does not set for the paper free Lever release is worn or damaged B Check if the Lever release is worn or damaged Replace the Lever release 11 The inking mechanism does not func tion The print mecha nism functions normally but the inking mecha nism does not function at all 1 Bad ribbon cas sette A Ch...

Page 34: ...2 14 Handling Maintenance and Repair Board assembly terminal functions Figure 2 12 Board Assembly Terminal Functions ...

Page 35: ... by the company References The number of printers that can be oiled with the minimum supply unit 40gr G 36 Approx 100 printers O 3 Approx 100 printers 2 4 2 Oiling Standard Use G 18 G 2 and 0 3 oil for oiling this unit Before oiling during disassembly and reassembly clean the unit well Refer to Tables 2 4 3 Oil ing point list and Figs 3 2 and 3 4 Overall oiling diagram for oiling points the number...

Page 36: ...n printing head unit and shaft carriage shaft carriage guide six points Point oiling G 36 2 mm diameter grease Point oiling G 36 Contact point between ground plate head and shaft carriage guide A 11 One drip Table 2 4 Oiling Points Oiling point number Oil type Oiling point Method of oiling Quantity of oil Point oiling O 3 Supporting point of cam shaft holder B 1 One drip Point oiling O 3 Contact p...

Page 37: ...unit and frame assembly B 15 Quarter rotation with 1 mm diameter grease B 16 B 17 B 18 Point oiling G 36 Retaining ring Type E fixing lever release three points Oil the inner side of the ring Point oiling G 36 Retaining ring type E fixing spool gear assembly B 19 Oil the inner side of the ring Contact point between ribbon feeding gear and the frame assem B 20 bly Point oiling G 36 1 mm diameter gr...

Page 38: ...iver 0 4 Precision phillips screwdriver 1 5 Tweezers 6 Slanted blade cutter 7 Pliers 0 8 Electric solder iron 9 ET holder 1 5 10 ET holder 2 3 11 Thickness gauge 0 45mm 0 5mm 0 55mm 12 Commercially available 2 5 TOOLS AND OIL 2 5 1 Tool List The following tools are necessary for maintenance and repair of M190G Table 2 5 Tool List ...

Page 39: ...failures 3 2 Assembly The printer comprises one subassemblies and 10 main assembles Parentheses around a step number indicate that you must apply lubrication when carrying out that step of the assembly procedure Refer also to section 2 4 3 Oiling Points as well as Figure 3 2 Overall Oiling Diagram at the back of this manual for information about all lubrication that must be carried out during and ...

Page 40: ... 1 Cam trigger assembly x 1 2 Trigger coil x 1 3 Trigger plate 3 x 1 4 Trigger plate spring x 1 5 Trigger lever x1 6 Trigger lever spring x 1 7 Cam trigger unit holding tool x 1 Cam trigger assembly Trigger coil Trigger plate 3 Trigger plate spring Trigger lever Trigger lever spring Cam trigger holding tool ...

Page 41: ...ver Then set the spring hooks into the trigger lever latches A into A B into B Side A Side B Round side A A B B C Trigger lever spring Trigger lever Trigger lever Trigger lever spring B A Final Figure Model M190G Technical Manual Assembly Instructions When attaching trigger plate 3 Set so that side B see illustration is at the trigger coil side ...

Page 42: ...that it remains flush with trigger plate 3 and attach the cam trigger unit holding tool Be sure that positioning meets the following two conditions Be sure the holding tool is positioned correctly with respect to protruding area A of the cam trigger assembly as shown in the drawing Be sure that the holding tool is positioned correctly with respect to flat area of the cam trigger assembly when lowe...

Page 43: ...ding gear Adjustment washer B RE 2 3 Model M190G Technical Manual Main Assembly 1 Assembly Sequence Assemble the parts with the following order 1 Frame assembly x 1 2 Adjustment washer B 2 6 0 13 4 7 x 1 3 Ribbon feeding gear x1 4 Spool gear spring x1 5 Spool gear shaft x 1 6 Spool gear x 1 7 RE 2 3 x 1 ...

Page 44: ... the slit in the spool gear shaft Make sure that the spring is positioned correctly with respect to the shaft as shown in the drawing To attach the spool gear shaft Rotate either the spool gear or the shaft to make the attachment Be careful that the spring does not come off as you make the attachment A part of the spring ...

Page 45: ...r indicate that you must apply lubrication when carrying out that step of the assembly procedure 1 Motor assembly x 1 2 Cam trigger unit subassembly 1 x 1 3 Cam shaft holder x 1 4 Remove the Cam trigger unit holding tool 4 Protector_detection plate x 1 5 lead wire red x 1 6 Lead wire black x 1 7 Detection plate x 1 8 CF M2 4 x 1 Tighten to torque 19 6 24 5 N cm 2 0 to 2 5kg cm 9 Arrange the red an...

Page 46: ...ply the specified lubricant to the locations shown in the drawing below Refer to Table 2 3 Oiling Points and Figure 3 2 Overall Oiling Diagram for details When attaching the cam trigger unit Tilt the cam trigger unit and motor assembly as shown in the drawing Motor assembly Cam trigger unit ...

Page 47: ...and B on the frame assembly 3 Push the holder in the direction of the cam trigger assembly Rotate the hold tool in the direction shown by arrow 1 see drawing below so that the C area of the holder is put into the C area 4 Turn the holder in the direction of arrow 2 until it clicks into place Use the special holder mounting tool Final Figure A B B A C C 1 2 Cam shaft holder Frame assembly Model M19...

Page 48: ...he protector 1 Pass the red and black lead wires through hole A on the protector 2 Align protector areas B with areas B of the frame assembly 3 Turn the protector in the direction of the arrow until it clicks into place When connecting the lead wires Solder the wires in place as indicated in the drawing A A A B C B B Trigger lever Cam shaft holder Trigger lever spring A B B Protector detection pla...

Page 49: ...he drawing Two holes in the frame assembly Lead wire black Lead wire red Model M190G Technical Manual When attaching the detection plate Push the plate in all the way When attaching the CF M2 4 Make sure that the 2 dowels on the motor assembly align with the two holes in the frame assembly ...

Page 50: ...pply lubrication when carrying out that step of the assembly procedure 1 Lever_fast feeding x 1 2 Fast feeding lever shaft x 1 3 Fast feeding lever spring x 1 4 Cam_paper feeding x 1 5 Spring_paper feeding cam x 1 6 Ribbon drive gear x 1 Lever_fast feeding Fast feeding lever shaft Ribbon drive gear Spring_paper feeding cam Cam_paper feeding Fast feeding lever spring ...

Page 51: ...er to Table 2 3 Oiling Points and Figure 3 2 Overall Oiling Diagram for details Lever_fast feeding Projectiing area of the frame assembly Frame assembly Fast feeding lever shaft Groove on the shaft O fook C hook Fast feeding lever spring Model M190G Technical Manual Assembly Instructions To attach the fast feeding lever shaft Align the groove on the shaft with the projecting area of the frame asse...

Page 52: ...e cam_paper feeding taking note of the following Flat area of the cam must be facing the ribbon feeding gear The pin on the paper feeding lever must fit into the groove on the cam To attach the ribbon drive gear Push the gear in until it clicks into place Flat area of the cam trigger assembly Bottom of the frame assembly Pin on the paper feeding lever Flat area of the cam_paper feeding Ribbon feed...

Page 53: ... the followings 1 Be sure that the three latches are correctly positioned Circuit board assembly CP M2 2 3 2 1 Model M190G Technical Manual Main Assembly 4 Assembly Sequence Assemble the parts with the following order 1 Circuit board assembly x 1 2 CP M2 2 x 2 Tighten to torque 19 6 24 5 N cm 2 0 to 2 5kg cm ...

Page 54: ... 5 Assembly Sequence Assemble the parts with the following order 1 Print head unit x 1 2 Shaft_carriage x 1 3 Spring_carriage x 1 4 RE 1 5 x 1 To fasten the spring_carriage 5 Shaft_carriage guide x 1 6 RE 1 5 x 2 To fasten the shaft_carriage and shaft_carriage guide A B Spring carriage Print head unit Shaft_carrige Shaft_carriage guide RE 1 5 RE 1 5 ...

Page 55: ...own in the drawing Pin on the print head unit Groove on the cam trigger unit Shaft_carriage guide Spring_carriage RE 1 5 RE 1 5 Model M190G Technical Manual Assembly Instructions To attach the print head unit Insert the pin on the print head unit into the groove on the cam trigger unit ...

Page 56: ...3 18 Disassembly and Reassembly To attach the shaft_carriage Push the shaft in the direction shown by the arrow while attaching the RE s to the inside of the frame assembly Push RE 1 5 ...

Page 57: ...assembly work is completed Use the following procedure to attach the platen unit 1 Fit the pin on the paper feeding lever into oblong hole A on the platen unit Ground plate CP P1 M2 4 Paper feeding platen unit Model M190G Technical Manual Main Assembly 6 Assembly Sequence Assemble the parts with the following order 1 Paper feeding platen unit x 1 2 Ground plate x 1 3 CP P1 M2 4 x 1 Tightening torq...

Page 58: ...the platen unit fit into the cutouts on the frame assembly To attach the ground plate Fit the projection part of the ground plate into the slit in the platen unit Frame assembly Paper feeding platen unit Oblong hole A on the paper feeding platen unit Pin on the paper feeding lever Cutouts of the frame assembly ...

Page 59: ...Disassembly and Reassembly 3 21 Lever_release RE 2 3 Model M190G Technical Manual Main Assembly 7 Assembly Sequence Assemble the parts with the following order 1 Lever_release x 1 2 RE 2 3 x 1 ...

Page 60: ... 1 Solder the red and black lead wires 2 Solder the print head unit FPC 3 Solder the trigger coil terminals Assembly Instructions To solder the red and black lead wires Arrange the lead wires as shown above A area Trigger coil terminals Lead wire red Lead wire black Print head unit FPC Circuit board assembly A ...

Page 61: ...ook the cover s three latches to the frame assembly Then hook the remaining latches to the shaft_carriage guide Cover Three latches of the cover Model M190G Technical Manual Main Assembly 9 Assembly Sequence Assemble the parts with the following order 1 Cover x 1 ...

Page 62: ...bly Main Assembly 10 Assembly Sequence Assemble the parts with the following order 1 Manual knob x 1 2 Gear_knob x 1 Assembly Instructions To attach the manual knob Push the knob in until it clicks into place Gear_knob Manual knob ...

Page 63: ...the paper feeding platen unit in place 2 Using a gap gauge adjust so that the gap is 0 5 0 05mm at each of the three locations indicated in the drawing 3 Retighten the two screws to a torque of 19 6 24 5 N cm 2 0 to 2 5 kg cm 4 Check the gap again with the gauge If the gap is outside the range indicated above 0 5 0 05mm repeat the adjustment from step 1 ...

Page 64: ...E 2 3 1 121 Circuit board assembly 1 123 Cross recessed Pan head screw 3 2 2 F Zn 2 124 Print head unit 1 125 Shaft carriage 1 126 Shaft carriage guide 1 127 Spring carriage 1 128 Retaining ring Type E 1 5 3 129 Paper feeding platen unit 1 130 Cover 1 131 Spool gear 1 132 Shaft gear spool 1 133 Spool gear spring 1 134 Ribbon feeding gear 1 135 Adjustment washer B 2 6 0 13 4 7 1 136 Retaining ring ...

Page 65: ...3 27 P U S H E J E C T Figure3 1 Overall Disassembly Diagram Model M190G Technical Manual Overall Disassembly Diagram ...

Page 66: ... head and shaft carriage guide A 11 One drip Oiling point number Oil type Oiling point Method of oiling Quantity of oil Point oiling O 3 Supporting point of cam shaft holder B 1 One drip Point oiling O 3 Contact point between trigger lever and lever fast feeding B 2 One drip Point oiling O 3 Shaft of roller paper holder in the paper feeding platen unit B 3 One drip B 4 B 5 Groove on cam paper feed...

Page 67: ...am trigger unit and frame assembly B 15 Quarter rotation with 1 mm diameter grease B 16 B 17 B 18 Point oiling G 36 Retaining ring Type E fixing lever release three points Oil the inner side of the ring Point oiling G 36 Retaining ring type E fixing spool gear assembly B 19 Oil the inner side of the ring Contact point between ribbon feeding gear and the frame assem B 20 bly Point oiling G 36 1 mm ...

Page 68: ...A 6 A 9 A 10 A 7 A 8 B 22 B 23 B 8 B 9 B 1 A 2 B 14 B 13 B 15 A 1 B 2 B 4 B 7 B 6 A 3 B 5 A 4 B 19 B 18 B 16 B 21 B 17 B 12 B 10 B 11 B 3 B 20 Figure3 2 Overall Oilling Diagram Model M190G Technical Manual Overall Oilling Diagram ...

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