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Commodore MPS-803, Service Manual

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Summary of Contents for MPS-803

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Page 3: ...ERATION 2 1 I Precautions 2 2 II Parts identification 2 3 III Operating functions 2 4 IV Setting u p 2 6 CHAPTER 3 OPERATING PRINCIPLE 3 1 I Operating principle 3 2 II Operating of the electronic p ar...

Page 4: ...1 1 CHAPTER 1 SPECIFICATIONS...

Page 5: ...model MPS 803 II General feature This is a bi directional printer of dot impact system using 8 vertical dots capable of printing 60 cps III Structure PRINTER CONTROL SECTION OPERATION PANEL SECTION T...

Page 6: ...s 2 0mm 0 3mm wire diameter Horizontal pitch 1 60 inch Vertical pitch 1 72 inch 60 cps Bi directional shortest distance printing Uni directional shortest distance printing rightwards 80 columns 10 cpi...

Page 7: ...he MANUAL LF function when data is not input b Has the PE CANCEL function c Has the TEST PRINT START function V General specifications 1 Power 1 1 Input AC 100V 117V 10 50Hz 60Hz 2 AC 220V 240V 10 50H...

Page 8: ...ting repetition possible by instruction d Print start position can be designated by character or dot POSITIONING e Standard characters double width characters and marks can be mix printed in one line...

Page 9: ...K PRINT remains designated for the following line if NL or CR is valid If 8th bit of the MARK data is 1 or 0 the data works as function code d SO X OE Designation command for DOUBLE WIDTH CHR PRINT mo...

Page 10: ...nd automatic line feed is performed Characters exceed including the END point are printed at the head of the following line If this designation is continued only the last value is valid g ESC X IB ESC...

Page 11: ...this command is smaller than 128 the whole designation is ignored When data of this command exceeds the printing range printing proceeds and starts from the head of the following line including line f...

Page 12: ...ong OPEN nl n2 and n3 Sent to the printer right after the listener address Secondary address is often omitted a Secondary address 0 GRAPHIC mode b 7 BUSINESS mode c when omitted GRAPHIC mode d when ot...

Page 13: ...tatus turns on at the start of mechanical operation At this time PE detection works and the POWER LAMP flickers at data input CLOCK DATA FLICKER ON LINE Detection occurs at data input POWER LAMP flick...

Page 14: ...ion Paper feed is not done c This switch is invalid during ON LINE Still it has the function to cancel PE until the first print command and buffer full Invalid after this until UNL d Turn the power on...

Page 15: ...quirements Other requirements refer to the circuit diagram LOW level 0 4 V or lower Other requirements refer to the circuit diagram 3 INTERFACE CIRCUIT DIAGRAM ATN DATA OV GND CLOCK RES F B FERRITE BE...

Page 16: ...l the BUSY status inside this device goes off e If this device turns into the ERROR status due to a disorder within this device Response to the bus is not executed at all 4 1 CBM serial interface a Da...

Page 17: ...1 14 5 Program general flow This flowchart is not precise Shows the conception of data flow INITIALIZE ROUTINE DATA RECEPTION MAIN ROUTINE DATA RECEPTION ROUTINE...

Page 18: ...1 15 LF SW INTERRUPT DATA PROCESSING ROUTINE TO THE PRINT ROUTINE...

Page 19: ...T ROUTINE 1 16 cPRINT INTERRUPT YES MOTOR ERROR 4LF___1 LINE FLAG CLEAR PRINT DATA READ IN MSB CLEAR HEAD DATA OUTPUT HEADiON PULSE WIDTH TIMER SETTING HEAD OFF HEAD DATA CLEAR RETURN TO THE MAIN ROUT...

Page 20: ...0 1 2 j 4 5 6 7 8 9 A B C D E F 1 17 5INESS MODE...

Page 21: ...o 1 2 3 4 5 6 7 8 9 A B C 1 18...

Page 22: ...272 S...

Page 23: ...2 1 CHAPTER 2 OPERATION...

Page 24: ...ibbon because the print head might be damaged 8 Turn off the power quickly and remove a foreign object if you drop it into the printer 9 Do not subject the Printer to temperatures below 5 C or above 4...

Page 25: ...2 3 II Parts identification Shown below are the names of parts of the printer Platen Knob Power Cord Back View...

Page 26: ...er is turned on These jacks are used to connect your Printer to the computer Use the Serial Interface cable supplied with Printer Refer to Section 10 for complete connection instructions a 1 The Conne...

Page 27: ...er Cord Use the power cord supplied with your Printer 9 Name Plate This plate describes Model Name required power source voltage and acquired standards 10 Connecting the Printer to Your Computer To co...

Page 28: ...o the direction of arrow to stretch the ribbon Ribbon Claw Ribbon Guide Ribbon Advance Knob b Remove the top cover Lift both side ends and pull into the direction of arrow c Slip the ribbon in between...

Page 29: ...right the ribbon guide slowly and horizontally and fix it to the printer body Ribbon Guide e Turn the knob into the direction of arrow to stretch the ribbon Note Make sure the top end of the ribbon is...

Page 30: ...t loading a Push the paper release lever to OPEN b Insert the paper into the direction of arrow c Pull the paper release lever into the direction of arrow d Turn the platen knob as shown until the pap...

Page 31: ...sh the paper release lever to OPEN Hold the paper and make the edges parallel Then set paper release lever to the closed position f Turn backward the platen knob and set the paper to the print start p...

Page 32: ...ps by pulling them frontward b Insert the front hooks of the tractor unit into the holes located at the upper end of the top cover and securely fix the unit onto the platen shaft Engage the rear hooks...

Page 33: ...er holder to fit Put down the paper holder cover and push the paper release lever to OPEN e Turn the platen knob and set the paper to the print start position Note 1 After the paper setting press the...

Page 34: ...the home position at the far left If this does not happen and that highly unlikely turn off both machines check all connections and try again If you still get no response contact your Commodore dealer...

Page 35: ...3 1 CHAPTER 3 OPERATING PRINCIPLE...

Page 36: ...the character generator sends the print command pulses to the driver to operate the solenoids which push the print wire through the armature onto the ink ribbon finally onto the printing paper Print...

Page 37: ...hich is fixed to the carriage with a holding plate As the CR motor runs forward and reverse the C drive pulley turns to move the T belt and carriage right and left along the guide bar and frame plate...

Page 38: ...PF roller assy is built right under the platen Three roller retaining springs are used to hold three roller assys on the platen Paper is caught between the platen and the roller and fed as the platen...

Page 39: ...n feed mechanism Revolution of the CR motor is transmitted to the carriage idle pulley through the motor gear C drive pulley and T belt MM310 3 2 And then to the ribbon drive gear through the idle pul...

Page 40: ...3 6 H Operation of the electrnonic parts 1 Structure P3 J8 etc are the connector Nos on the logic card...

Page 41: ...Modeo 1 XI X2 Crystal ANT 0 Analog Input KI5 Road Strobe WR Write Strobe ALE Address Latch Enable RESET Reset VAREF Reference Voltage The control program and the CG ROM are masked in the 4K byte ROM...

Page 42: ...ton terminal is connected to the F G Frame Ground and shields the interface cable Interface timing conforms to the CBM Serial Interface Data reception timing is described in the following ATN f CLOCK...

Page 43: ...witch LFSW signal is set to LOW which executes one line feed When LOW status is maintained for about 0 5 second the CONTINUOUS LINE FEED mode turns on This is maintained until LFSW signal changes to H...

Page 44: ...done the carriage is moved to the center If LEFT END detection still continues MOTOR ERROR occurs Actual PE processing is executed at 3 lines after the PESW signal has turned to HIGH status PE detect...

Page 45: ...he following paragraphs explain the installation of external ROM CPU When the internal ROM is used Mode 0 terminal is set to and MODE 1 to HIGH If the external ROM is to be used 1 terminal shall be se...

Page 46: ...ith the operating speed at 200 pps 36 steps is necessary for l 6 feed Paper feed is executed by the excitation sequence shown on the left For driver IC M54567 second source TD 62308AP is sometimes use...

Page 47: ...excitation l 60 per 1 step with the operating speed at 360pps The carriage reverses when the excitation sequence for the LF motor mentioned before is applied Basically performs 8 pulse SLEW UP DOWN Wh...

Page 48: ...led Therefore the head solenoid transistors on the power source side and the ground side are always controlled together at the same time Transistor Q10 on the power source side is provided with a ther...

Page 49: ...ilize print quality ANO signal is used for this purpose and is the voltage obtained by dividing 24V by resistance u E f i S o a 0 c O H C O C O 4 4 s 24V Power Source Voltage Adequate Pulse Width for...

Page 50: ...nting is 24 V approximately 5V power source is stabilized by the 3 terminal regulator 7805 Its output is 5 5 V at normal condition 9V power is taken at the regulator input It has 10 V at rated input T...

Page 51: ...4 1 CHAPTER 4 MAINTENANCE...

Page 52: ...ng the power supply parts remove the power cable from the outlet and surely turn off the power 5 Do not lose screws and washers removed for parts replacement 6 When using the tools which generate heat...

Page 53: ...t of parts 1 Detachment attachment of the cover and ribbon cassette i _ Detachment3 1 Lift up part a 2 positions right left of the TOP COVER and disengage the lock Detach it by pulling it forward 2 Re...

Page 54: ...ette Ribbon Advance Knob I R ib b o n G u id e R ib b o n C a s s e t t e A s s y 5 H o ld th e c a s s e t t e a t th e c e n t e r a n d l i f t i t up t o d e t a c h fro m th e b o d y R ib b o n...

Page 55: ...SWITCH CARD HARNESS CONNECTOR and remove the lead wire from the WIRE HOOK B on the BASE COVER Then the BODY COVER can be detached from the printer body Note Hold the connector when pulling it off Do n...

Page 56: ...For attaching the ribbon cassette refer to Section 4 of CHAPTER 2 2 Detachment attachment of the head Detachment 1 Detach the top cover 2 Move the head to the right end as shown below 3 Pull out the...

Page 57: ...4 5 Slide the HOLDING PLATE fixed on the carriage to the right and pull it upward 6 Push the HEAD HOLDING SPRING onto the PLATEN and pull upward the PRINT HEAD strongly to remove the HEAD...

Page 58: ...it to the left 4 Push down the HEAD strongly to fix it into place 5 Bend the TAB and insert it to the connector 6 Make sure the cable is installed in the FRAME GUIDE 7 Check if the carriage moves smo...

Page 59: ...such troubles as uneven darkness of print characters and ribbon blotting may occur To avoid this adjust the clearance properly 1 Use the CLEARANCE ADJUSTING LEVERS provided to the FRAME on both sides...

Page 60: ...ff the PE EP HARNESS ASSY and connectors of the CR motor and LF motor Then the FRAME UNIT can be separated from the BOTTOM COVER Note Pull off the connectors by holding the connector body Do not hold...

Page 61: ...h a new T belt Attachment 1 Perform attachment following the reverse of the detachment procedures T belt adjustment If tension of the T belt is not proper the belt may skip on the gears or the load in...

Page 62: ...CR MOTOR UNIT 4 Remove FLAT WASHER SMALL 4 C CARRIAGE I PULLEY FLANGE D and C DRIVE PULLEY E from the shaft 5 Attach the parts removed in 4 above to a new CR motor and secure them with RETAINING RING...

Page 63: ...UNIT following the reverse of the detachment procedures for the cover and head described before 2 Detach the PLATEN ASSY PLATEN SHAFT BRACKET and RELEASE LEVER upward Pull outward and disengage the l...

Page 64: ...with the frame 1 Adjustment of LF motor mounting position 1 Loosen the LF Motor tightening screw and adjust so that the backlash between LF motor gear and LF idle gear is maintained within 0 05 to 0 2...

Page 65: ...chment of the logic card Detachment 1 Detach the logic card following the detachment procedures of the cover and frame unit as described before 2 Pull out the CONNECTOR A of the TRANSFORMER ASSY Note...

Page 66: ...the noise filter 11 Detachment attachment of the noise filter Detachment 1 Detach the noise filter by following the detachment procedures of the cover and frame unit 2 Disconnect the Faston terminals...

Page 67: ...the cord following the reverse of the detachment procedure HE Lubrication Supply oil to the parts mentioned below at replacement 1 GUIDE BAR all around 2 Sliding part between FRAME PLATE and CARRIAGE...

Page 68: ...5 1 CHAPTER 5 CIRCUIT DIAGRAMS...

Page 69: ...r 2 9 1 g 1 K W i n R3i _ fsi f i ts ltsM J fr 0 I I G I pggjc bl C T r Ir R5I C 28 CAUTION MOS 1 C MADE IN JAPAN 5 2...

Page 70: ...ORV 6 6 HORV 7 7 PiN 8 8 8 PiN 1 9 9 PiN 6 10 10 PiN 4 11 11 N 2 P4 LF A 6 6 LFB 5 5 LF A 4 4 LFB 3 3 LFO RV 2 2 LF DRV 1 1 P7 OV 3 3 PESW 2 2 HPSW 1 1 J1 J2 RES 6 6 OATA S S CLOCK 4 4 ATN 3 3 OV 2 2...

Page 71: ...5 4 RESET CD7...

Page 72: ...6 1 CHAPTER 6 PACKAGE DRAWINGS...

Page 73: ...2 COVER LID 3 U23047001 1 BODY COVER 4 U23048001 1 FRONT COVER 5 U32143001 1 CIRCUIT BOARD 48W006 ASSY 6 571969000 1 CORD HOLDER 2 7 U23057001 2 PAN CUP B 3 0 x 20 8 U23056000 1 POWER SUPPLY HOLDER 9...

Page 74: ...6 3 2 Parts Code 1 U23036001 2 U23042001 NOTE Service order U23095001 RC Box A12 ASSY Q ty Name 1 RIBBON CASSETTE ASSY 1 RIBBON GUIDE U23097001 RC Box A300 A S S Y...

Page 75: ...77001 U23005001 U22078001 5335270 01 U23165001 1 1 1 3 2 3 2 1 FRAME P RELEASE GEAR P RELEASE SHAFT PF ROLLER ASSY ROLLER HOLDING SPRING PF ROLLER SHAFT PAN SEMS 3 x 8 DB ROLLER HOLDING SPRING A NOTE...

Page 76: ...N SEMS 2 6 x 8DB 3 U23028000 1 LF IDLE GEAR 216 4 U23032001 1 PLATEN KNOB 5 048060345 2 RETAINING RING E6 6 U23154000 2 PLATEN SHAFT BRACKET 7 U23030001 1 PLATEN 8 U23033001 2 PLATEN SHAFT 9 U23034001...

Page 77: ...6 5 Parts Code Q ty Name 1 U23007000 1 HOLDER PLATE 2 U23300001 1 HEAD ASSY P8 3 U23017001 1 T BELT MM310 3 2 4 U23006000 1 CARRIAGE 5 U23159000 1 HEAD CABLE SHEAT A 6 U23008000 1 HEAD HOLDING SPRING...

Page 78: ...019001 9 U23026000 10 U23024000 11 533527001 12 U23027001 2 1 1 1 2 1 1 1 1 1 1 1 PARALLELISM ADJUSTING CAM GUIDE BAR PAN SEMS 3 x 8DB FRAME PLATE E4 RETAINING RING CARRIAGE IDLE PULLEY CARRIAGE I PUL...

Page 79: ...15000 1 C DRIVING PULLEY 17 Z20251001 1 42CR MOTOR ASSY 18 533527001 2 PAN SEMS 3 x 8DB 19 U23025001 2 SPRING CLUTCH 5 20 510061001 2 WASHER 21 025050135 1 FLAT WASHER SMALL 5 NOTE 1 Parts code of ASS...

Page 80: ...001 1 U32052001 1 U32164001 1 U32231001 1 U32251001 1 TRANSFORMER 100 117 ASSY TRANSFORMER 220 240 ASSY COLLAR SCREW 3 5 x 6 NOISE FILTER MR2021 NOISE FILTER MR2021V PAN SEMS 3 x 7DA PROTECTOR SW0 5A...

Page 81: ...1 8 037281213 1 9 U23175000 1 10 U32161001 1 11 519475002 1 12 550719002 1 13 U32152001 1 PE HP HARNESS WHOLE ASSY PAN TAP 2 TYPES 26 x 12 ELECTROSTATIC WIRE FG WIRE ASSY COLLAR SCREW 3 5 x 6 RING 4...

Page 82: ...6 11 Parts Code Q ty Name 1 U32027001 1 CIRCUIT BOARD 8W005 ASSY 2 U23058000 1 INSULATOR 3 U32158001 1 INT FG WIRE ASSY 4 519475002 1 COLLAR SCREW 3 5 x 6 5 550719002 1 RING 4...

Page 83: ...1 PIN FEED COVER L 7 037260812 2 PAN TAPPING V SHOE 2 6 8 U23064001 1 W IDLE GEAR 9 U23063001 1 W IDLE GEAR SHAFT 10 U23062001 1 PIN FEED FRAME 11 U23080001 1 PIN FEED COVER R 12 U23070001 1 WHEEL FRA...

Page 84: ...7 1 CHAPTER 7 TROUBLESHOOTING...

Page 85: ...supplied Fuse or rectifier bridge on the logic card trouble Power transformer trouble 8 When not flickering ROM CHECK ERROR is suspected CPU trouble or RfiSET signal circuit trouble 3 Head does not mo...

Page 86: ...ot suspected the carriage driver IC on the logic card and CPU trouble Trouble around transistor 08 CR motor resistance approx 1060 RED COMMON 9 At POWER ON POWER LED does not come on though carriage c...

Page 87: ...This was brought to you from the archives of http retro commodore eu...

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