Commodore MPS-801 Service Manual Download | Manualshive

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Summary of Contents for MPS-801

Page 1: ......

Page 2: ...ormation con tained herein The listing of any available replace ment part herein does not constitute in any case a recommend ation warranty or guaranty as to quality or suitability of such replacement...

Page 3: ...TROUBLESHOOTING GUIDE 12 WIRING DIAGRAM 15 CONNECTOR NOTES 16 TRANSFORMER PCB ASSEMBLY PARTS 17 SCHEMATIC 18 MAIN LOGIC PCB ASSEMBLY PARTS 19 SCHEMATIC 21 MECHANICAL ADJUSTMENTS GUIDE PILLAR INSTALLAT...

Page 4: ...and symbols All PET graphic characters 7 vertical dots 480 columns maximum Dot addressable CBM ASCII code Height 7 dots 0 111 inch Width 6 dots 0 099 inch 50 CPS left to right uni directional 80 Colum...

Page 5: ...r I 5VDC I CONTROL CIRCUIT I I 20 VDC I I DRIVERS REGULATOR I L _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 1 DOT SENSOR POWER LAMP H SOLENOID 1 PLATEN r I I PAPER FEED I I I...

Page 6: ...FLOWCHARTS 1 Main flowchart Enters READY status to input NO 3...

Page 7: ...I a I aJ Q 0 C i S I 3 I c SEVENTH DOT PIN REG PIN DATA REG 11111 r1111110 D PIN CNT PIN REG DOT SNS PIN DATA REG FIRST DOT Counter for 1 column 7 dots of character pattern Register storing 1 column...

Page 8: ...epping motor LF STEP REG LF PW A register memorizing the number of steps per line feed Power for the LF stepping motor I I 1 ___ 1Oms I 1 144 inch is the smallest unit of movement and occurs when the...

Page 9: ...mer motion the left to right movement of the hammer and the revolution of the platen are precisely synchronized As the platen rotates for each ridge seven dot signals are sent to the CPU The CPU then...

Page 10: ...er GP DR 2 7 ON LOW When it is ON the H solenoid is activated which allows the recovery spring to return the print head to the home position The HOME signal TEST PIN which is shaped from the output of...

Page 11: ...shaped output signal from the dot sensor and as shown in the figure below it comes in groups of 34 sequential pulses When the HOME signal goes LOW the CPU starts to count the number of dot pulses unti...

Page 12: ...line feed the CPU waits until the HOME signal goes HIGH which means the print head has returned to the home position When the HOME signal becomes HIGH the CPU sets the HC signal HIGH about 160ms later...

Page 13: ...ed by lifting the connector housing inserting the cable and then pressing the housing down until it clicks into position make sure the connection is good by pulling up on the cable slightly 6 The smoo...

Page 14: ...cloth and dry rapidly Use good quality clean liquids Plastic parts of Wipe off dirt the enclosure Rubber parts Wipe off dirt Electrical parts Do not wash Wipe off dirt with a cloth dampened with benz...

Page 15: ...is broken Replace it 2 H solenoid is defective To check H solenoid remove cable at connector CN 4 Take an ohmmeter reading between pins 1 and 2 Approx imately 63 ohms resistance should be present 3 T...

Page 16: ...of PIN Repair it MN 1l 210 or 250us SYMPTOM 4 Some part of a printed character is missing POSSIBLE CAUSE SOLUTIONS 1 Part of the platen ridge is broken Replace the platen 2 Control PCB is defective R...

Page 17: ...esistance should be present at each pin 2 Control PCB is defective Check signals LF1 LF4 and repair SYMPTOM 7 Self test does not work POSSIBLE CAUSE SOLUTIONS 1 Dot sensor is bad Replace it or repair...

Page 18: ...CK HEAD PCB r HOME SENSOR VC RELAY PCB PRINT VC HEAD PCB 0 E 62384 94HB 0 BLUE ORANGE LF MOTOR YELLOW BROWN RED J BLACK CARRIAGE RED MOTOR WHITE J H SOLENOID CLUTCH WHITE CARRIAGE RETURN BLUE BLACK HO...

Page 19: ...erminal of the lamp PCB unit must be connected to pin 1 of CN7 connector 7 of the control PCB The wire of the lamp harness is marked with white to indicate pin 1 C Lamp harness t white mark No 1 termi...

Page 20: ...02 5155 ALL PARTS SVT AWG18 84802 5351 U INCLUDED IN Fuse MT4 630 mA 250V 84802 5301 BOTTOM CASE Toroidal Coil SC 02 101 2A 8409 30200 ASSEMBLY 314555 01 Ceramic Cap 10000 pF 125V MURATA 8409 02043 Ce...

Page 21: ...V Il C3 T I I I I I e PRIMARY CIRCUIT TRANSFORMER 2 13 12 a t c 11 z 0 frl 10 rn 9 8 6 1 0 1 l1 0 1 2 AC23V 1 ____ 0 3 l 1 01 4 1 0 5 r Q 6 AC15V 9V J AWG18 Ul STYLE 1007 CSA TYPE TR 54 GREEN YElLOW S...

Page 22: ...74LS373 ROM CUSTOM PART TRANSISTORS 01 02 03 DIODES 01 02 03 04 05 06 07 Small Signal 2SC458C Hitachi 2501276 Voltage Reg p A 7805VC 152076 Hitachi 152076 Hitachi 152076 Hitachi 21 V Zener HZ22 1 Hit...

Page 23: ...C7 Ceramic 022jlF 25V 8409 01266 C8 Ceramic 022jlF 25V 8409 01266 C9 Ceramic 022jlF 25V 8409 01266 C10 Ceramic 022jlF 25V 8409 01266 C11 Ceramic 022jlF 25V 8409 01266 C12 Ceramic 022jlF 25V 8409 0126...

Page 24: ...NSER VALUES A IN JJfl UNLESS OTHEI1WISE SPECIFIED 1 2 WITU HEAT SINK e SlY I n6 I rrsTQ R71 4 5 2 L_ r r JoE l TP3 e CN3 OM s J 1 7 1 Co VI J 2 4 D IIC 8 I ml 0 _ _ _ _ J II VM eN u _ 14M W S2VB F l n...

Page 25: ...ide pillar B 2 Insert the head adjustment lever into the left end of guide pillar B and tighten the flange nut e so that the foot of the lever is set in click hole as shown in the figure below when pa...

Page 26: ...e foot of the head adjustment lever is at position I as shown on page 22 Guide Pillar Adj 4 Firmly tighten up the two screws and make sure that smudging does not appear when the foot of the lever is a...

Page 27: ...n of the dot sensor unit as follows a Normal a b The uppermost part is missing missing b e missing The hammer starts printing too early when a platen ridge has not yet reached the correct position To...

Page 28: ...rotation detector be careful that the two bosses are engaged with the gears of the head motor PLATEN GEAR o 00 o I I I I I o ROTATION DETECTOR I I Rotate the platen gear so that one of the holes of it...

Page 29: ...B 1 2 C 31455101 801 SOUNDPROOF COVER w PAPER SHELF 1 3 C 31455201 801 FRONT BEZEL UNIT 1 4 C 31455301 801 TOP CASE 1 5 C 31455401 801 DECORATIVE PLATE ASSY 1 Plate w Paper Advance Switch 2 Lamp PCB H...

Page 30: ...Ribbon Drive Pulley Spring Shaft 2 Carrier Guide Pillar w Head Adj Lever 2 2 NOTE 2A The carrier unit with print head can be manually moved when the head solenoid is pressed as indicated by the black...

Page 31: ...tor 3 1 C31455901 801 PLATEN ASSEMBLY 1 Platen w Upper Cover 2 Paper Guides 2 3 2 C 31456101 801 GROUND PLATE ASSEMBLY 1 Bottom Ground Plate 2 Side Ground Plates 2 3 1 3 2 REF NO 4 1 C 31456001 801 TR...

Page 32: ...r w PCB 2 Dot Sensor w PCB 3 Wiring Harness w PCB 4 Cable Connector w PCB 5 3 C 31456401 801 CARRIAGE DRIVE BELT 5 4 C 31456501 801 HEAD SOLENOID 1 Head Solenoid w Mounting Plate 5 3 LONGER SIDE NOTE...

Page 33: ...sors Motors Continued REF NO 5 5 C 31456701 801 LlNEFEED MOTOR 5 6 C 31456601 801 HEAD MOTOR NOTE 5C When inserting C into the platen shaft be sure to reach the utmost end by rotating C while insertin...

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