Commodore 1526 User Manual Download

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Summary of Contents for 1526

Page 1: ...mation con tained herein The listing of any available replace ment part herein does not constitute in any case a recommendation warranty or guaranty as to quality or suitability of such replacement pa...

Page 2: ...OTOR 12 PRINT WIRE DRIVE 13 PRINT WIRE COIL PROTECTION 14 PAPER CONTROL LOGIC 15 CARRIAGE POSITION AND HOME SENSOR 16 1526 MPS 802 INTERFACE LOGIC 17 4023 INTERFACE LOGIC 18 TROUBLESHOOTING GUIDES 19...

Page 3: ...MUM COLUMNS 80 Columns LINE FEED SPACING 6 Lines inch in character mode 9 Lines inch in graphics mode LINE FEED SPEED 5 Lines sec in character mode 75 Lines sec in graphics mode PAPER FEED Pin feed PA...

Page 4: ...rtridge turn the printer off By carefully pushing the carriage position the print head in the center of the unit Turn the dial knob on the cartridge in the direction of the arrow until the ribbon is t...

Page 5: ...ers The left tractor assembly must be firmly pressed against the left stopper The right tractor assembly slides to allow adjustment for paper width Once the paper is aligned in the tractor turn the ma...

Page 6: ...41J S II H r 1tI e1234567e9 ABCOEFGHtJKLMNOPQRSThVL4 YZ t I iJ 5 I H rr 1I I I O123456789 ABCOEFGHIJKLMNOPORSThVWXYZt t4jJ S ftaH rr1I I r f 123456789 ABCDEFGHIJKLMNOPQRSTUVLj YZt Ia J 5 I H_rHl I F...

Page 7: ...any accumulated dust or particles from the unit Lubrication Oil the carriage pillars as indicated every 500 000 lines or once a year Use dry guaze to clean the pillars before oiling Oil sparingly and...

Page 8: ...ve data can be printable characters or control codes Printable characters are stored in RAM 256 bytes of RAM are available for character storage 128 bytes of RAM are in U4D and 128 bytes in U5D This R...

Page 9: ...AM Si S2 SELECT I O 1 I o MICRO PROCESSOR SELECT I O 2 SELECT I O 3 S3 ROM SELECT ROM INVERTERS PAPER FEED SWITCH AO A6 PAPER OU1 RS HOME POSITION DET HEAD POSITION DET DATA BUS DEVICE ADDRESS SELECTI...

Page 10: ...ll wave bridge rectifier which converts the AC voltage generated from the top secondary winding of the power transformer to DC voltage 26VDC Supply A shunt type regulator circuit generates the constan...

Page 11: ...r is turned on the 5VDC supply rises to its normal operating level This forward biases Q21 allowing C3 to charge When the voltage across C3 reaches 2 volts the output of the inverter U1C pin 6 goes lo...

Page 12: ...400 74177 n ___d A 4 1 MEG HZ 11 81 LJ10C 7400 0 01 F 10 _________ 7400 7400 47 0 Clock Circuit Crystal Yl generates the fundamental 4 MHz clock The circuit illustrated below the crystal stabilizes an...

Page 13: ...32 I O devices contain 128 bytes of RAM 256 bytes of storage is used as a line buffer and for processor scratch pad and stack operations U6D is a 6522 VIA This device controls the motors Port A signal...

Page 14: ...C C C cc C 1 Q Q i3 01 w 0 Il 01 A 0101 01 F3W CA o v v v 00 0 m m m m 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 J 0 0 1 0...

Page 15: ...I CIRCUITS L___J MICROPROCESSOR LOGIC I J CLOCK I CIRCUIT 1 I RESET I CIRCUIT J PULSE WIDTH CONTROL CIRCUIT RESET 0 H 7 10...

Page 16: ...r is a four phase stepper motor Sequentially exciting two phases at a time causes the motor to turn in step clockwise or counter clockwise See timing chart above Four outputs from U6D PA4 PA7 activate...

Page 17: ...ases are controlled the same way The output PAl CA Hold goes low and Qi 8 turns off when holding current is needed to hold the paper in position Two opposing phases are energized creating opposing tor...

Page 18: ...R12 suppress CEMF developed by the coils The inverters U5B and U6B are 7406 open collector Hex Inverters A one shot circuit generates VCC for U6B and U5B for 500 microseconds when a print wire is fire...

Page 19: ...goes high for 500 microseconds This turns on Q20 Q21 and Q22 The potential developed at the collector of Q20 is used as VCC for the open collector Hex Inverters U58 and U6B R39 should be adjusted to o...

Page 20: ...push button on the front of the printer causes a form feed to occur Form feed length is software controlled A low potential is applied to U5D pin 1 1 PA3 when the push button is depressed An LED insi...

Page 21: ...stepper motor turns a photo coupler device generates low pulses which are input to U1C pin 9 U1C is an inverter U1C generates high active pulses which are input at U5D pin 14 PA6 and U6D pin 40 CAl A...

Page 22: ...n 3 of P5 and P6 goes low U2C pins 2 and 3 go high U2C pin 4 goes low U2D pin 12 goes high and U2D pin 10 goes low This is the DATA output which acts as an acknowledgment to the ATTN input When the pr...

Page 23: ...ed pin 8 of P2 is an output that is low when data is being accepted because U4D pin 10 PA2 is high RFD Ready for Data pin 7 of P2 goes low indicating the printer is ready to receive data when data is...

Page 24: ...Red 5 Defective logic board Check for shorts on PCB See circuit theory on page 7 for proper operation of power supply circuit SYMPTOM 2 Printer initializes but will not print POSSIBLE CAUSE SOLUTIONS...

Page 25: ...1 Physical interference with Check for obstruction of the paper feed path proper paper feed paper guide platen tractors Check that the left tractor is positioned to the ex treme left and the right tra...

Page 26: ...riage does not move correctly POSSIBLE CAUSE SOLUTIONS 1 Physical obstruction in the Check that dirt or foreign objects have not path of the head carriage accumulated within the mechanism 2 Carriage m...

Page 27: ...08 C 325360 03 901 522 04 901522 03 TRANSISTORS Ri R2 R3 R4 R5 6 R7 R8 R9 R10 1 1 R12 R13 Ri 4 19 R20 R2 1 R22 R23 R24 25 R26 R27 35 R36 R37 R38 R39 R48 R54 R55 56 R57 R61 64 3 9K 10K 3 9K 10K 470 5W...

Page 28: ...34 Ceramic 047jF 50V P2 IEEE 48 Rt Angle Connector C35 Ceramic 01F 50V C 903206 01 C36 37 Ceramic 470pF 50V 4023 P3 3 Pin Keyed Header MISCELLANEOUS P4 4 Pin Connector P6 P7 6 Pin DIN Connector C 9033...

Page 29: ...24 pin ROM or 28 pin EPROM at location U8D A jumper change at J1 J4 will configure the board for either l C When changing chips at this location match the jumpers to the type of l C CLOSED Ji J2 CLOSE...

Page 30: ...Q A2 c8 Sf 2V w t it2 I o A 4 t1 I A4 lf A A A i A4 43 ____EE _ CR C6 V ZKE o 8OrTFi Top 1iEbE P80 RFS j 2I u4 5 t32 Al 4 CI 0 tIW a Pt Pt P02 P04 4 A2 _ 4 jk I I CR2 APo2 r2v C27 Q 9 Q 98 2Jt 1 4 qit...

Page 31: ...R e 22 Q22 rL______ 4t A _4 _f I Al 7 A5 F A 2fJ Jt 8t 4 2 2 W2 I I i I I I I I I I Iw _ F Io8 AY ii4C A P 4 22A _I_ O4 7LSO Ck2 CA27 Q9 Q j 501 1 MN cj 02 _ w I 4 zIZ PATTER I JUP vR 2L 3HORT ALL f...

Page 32: ...ion towards the back of the printer the print head is positioned as close as possible to the platen Print Head Set the head shift lever in its lowest position on the right side frame Position the prin...

Page 33: ...32 1 mm away from the inside left frame when printing standard characters Tighten mounting screw SIDE FRAME Using the self test check for the position of the leftmost dot If alternating lines are not...

Page 34: ...NNECTOR P1 ON MAIN LOGIC BOARD POSITION SENSOR 5 8LUE 7 6 RED 4 2 8 15 19 7 12 B 28 a 24 27 W 23 26 R 22 R 25 G 21 16 18 G 13 G 4 PAPER FEED MOTOR CARRIAGE MOTOR HOME SENSOR YELLOW 5 7 6 4 2 8 A PAPER...

Page 35: ...anism 2 1 Remove the manual paper feed knob by firmly pulling it from the shaft 2 2 Stand the unit up as shown and remove the 4 case screws at the cor ners If the 2 center shipping bolts are still in...

Page 36: ...ition on the side frame 3 2 Remove the 2 head screws 3 3 By gently pulling detach the FPC cable from its connector 3 4 Lift the print head from the carriage 3 5 Remove the ribbon guide screw 3 6 Lift...

Page 37: ...m the right side frame assembly 6 2 De solder the wire connections from the wiring harness PCB See wiring diagram on page 28 7 To remove the carriage position sensor and carriage motor 7 1 Remove the...

Page 38: ...o release the belt gear assembly on the right 8 3 The drive belt will be released from the gear assembly on the left and can be removed 9 To remove the sprocket frames and tractor assembly 9 1 The lef...

Page 39: ...e platen V cN d 1 11 2 11 To remove the platen and reduction gears 11 1 11 1 Remove the E clip and pull the reduction gear off of the frame gear by tapping it with a punch 11 2 Remove the spring pin f...

Page 40: ...guide pillar is removed by loosening the hex nuts at each end Next slide the pillar from its slots in the right and left frame plates 14 To remove the head shaft lever and right side frame plate 1 4...

Page 41: ...the E clip from the pillar 16 2 Gently pry the plastic sup porter from the shaft 16 3 Slide the pillar to the right to release it from the frame 16 1 A 16 2 17 To remove the paper roller assembly 171...

Page 42: ...ining left frame screw and slide the frame to release it from the base ASSEMBLY NOTES To reassemble the printer mechanism reverse the oraer of disassembly and follow these precautions The print head m...

Page 43: ...23 PLATE ASSY 1 Plate w Paper Advance Switch 2 Lamp PCB and Harness C 31458301 1 4 C 31458302 1526 BOTTOM CASE W PWR SUP ASSY 1 Plastic Case Ground Plate and Cover ASSY 2 Power Supply Assy MPS 802 BOT...

Page 44: ...1 1526 802 4023 GROUND PLATE ASSEMBLY 1 Bottom Ground Plate 2 Side Ground Plates 2 3 Sprocket Frame Left 4 PCB w Harness and Flexible Cable 2 6 C 31459101 1526 802 4023 GEAR REPLACEMENT KIT 1 All Plas...

Page 45: ...SECTION 2 MECHANICAL ASSEMBLIES 38...

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