Commodore MPS-802 Manual de Serviço

SERVICE MANUAL 1526 • MPS 802 • 4023 PRINTERS APRIL 1985 PN-314003-03 (::: C;C .n1n10dore COMPUTERS

The Power Supply CIRCUIT THEORY CR26 _::-::-::-:4 A:-'I/SO V or 1.S AlSO V on h.~t sink ~-r:----r-:U)"""'::::: +5 V N I'

CIRCUIT THEORY UIC U20 UIC 6 UIC RESET 1 _2 3 ~4 5 _ .~ Jl""o--;:4~_---:..;R:.:E.:.S-t-+-iI-+-i 74LS14 +24 V ~ o ">::a£ N "&ap

1526 AND 4023 CIRCUIT THEORY R56 1.15 2.2 "H V1 .. MHz l..r----?": --0-1--'~: -~ - , . L ____ " R55 C34 .04~ " ., "I&a

26 V +26V U5D 6532 PAO 81PF Holdl PA4 61PMOI PAS 7 (PM1) 11 U6D 6522 81PM21 3 PA6 PA7 IllPM31 9 1526 AND 4023 CIRCUIT THEORY Pl Jl 1. 14 STEPPING ORDE

CIRCUIT THEORY U5D 6532 +26 V , Pl Jl R3 ~~k ~ J. 9 (CA Hold! ~ 3.9 k? R5 P A 11--------,-13"..., ?C:>:1:-::"2"""'1&

CIRCUIT THEORY Fl Jl 5OO..s Puis ... ~;"':;";;"""'---3>~TP1_>-----, L 10 10 U5D 6532 11 11 t------~ 680nx8 C

• CIRCUIT THEORY U6D 6522 +5V PBo~1~0--~-----+-~2 V~ r Triger Rewt >--+_"""14 rewt r--_-+-----.,;6:..j TH OUT 1-"3_..JV'&

CIRCUIT THEORY +5 V P1 PJ R12 NO-PAPER SENSOR SWITCH 15 K PA2~1_0--------------~----~1818~----o U5D (6532) 1616~----------~ +5 V R54 P3 J3 PF KEY 47

+5V CIRCUIT THEORY U5D 6532 U6D 6522 PA6 14 iii c: '" u; 8 ...: iii CAt 40 -c: s-I/) a: CA2 1=-39~-J TIMING CHART *TIMING SIGNAL U1C-9 PIN

SERVICE MANUAL 1526 • MPS 802 • 4023 PRINTERS APRIL 1985 PN-314003-03 Commodore Business Machines, Inc. 1200 Wilson Drive, West Chester, Pennsylvan

• 1526 AND MPS 802 CIRCUIT THEORY +SV 1 kn x 4 P5/P6 Serial Interface Connector u; a:: SQR U2C ATTN 3 2 r--t-------...,---=18 PAO U2C Clock 4 5 6 PSI

4023 CIRCUIT THEORY P2 i.1 PATTE~N JUHf>£1? I SHORT ALL The 4023 IEEE Interface Circuit Theory All the signals on the interface are controlled by t

TROUBLESHOOTING GUIDE SYMPTOM 1: Printer does not initialize when powered up. POSSIBLE CAUSE SOLUTIONS 1 . Power cord is damaged. Check that the

TROUBLESHOOTING GUIDE (Continued) SYMPTOM 3: Part of a printed character is missing. POSSIBLE CAUSE SOLUTIONS 1 . Ribbon is worn out. Replace the r

TROUBLESHOOTING GUIDE (Continued) SYMPTOM 5: Improper Ribbon Feed POSSIBLE CAUSE SOLUTIONS 1. Obstruction of ribbon path. Check FPC cables for pro

PCB PARTS LIST • 1526 • MPS 802 • 4023 • C - Indicates Commodore Stocked Part Numbers Differences noted in PARENTHESIS! PCB Assy 1526 PCB Assy MPS 80

PCB PARTS LIST • 1526 • MPS 802 • 4023 • (Continued) C - Indicates Commodore Stocked Part Numbers CAPACITORS (Continued) MISCELLANEOUS (Continued) C

1526 • MPS 802 ROM UPGRADES The PCB for these printers was designed to accommodate a 24 pin ROM or 28 pin EPROM at location USD. A jumper change at J

DEVICE NUMBER CHANGE The 1526, MPS 802, and 4023 are shipped from the factory set for device #4. The channel can be hardware altered to #5,6,7,8,9,

ADJUSTMENTS Head Shift Lever The head shift lever controls the position of the print head in relation to the platen. With the lever in its lowest po

CONTENTS Title Page SPECIFICATIONS SET UP AND TESTING RIBBON CARTRIDGE ...

ADJUSTMENTS (Continued) Home Sensor To adjust the print start position, loosen the mounting screw for the home sensor. Slide it to the left or right,

TO CONNECTOR PI ON MAIN LOGIC BOARD WIRING DIAGRAM FPC CABLE HOME ~ISENSOR -----'--;~~ I '---RED-- _J A '-'-BLACK--EK ... -YELLO

MECHANICAL DISASSEMBLY The phillips head screws used in the printer mechanism are metric size. Use caution when select-ing the proper size screwdriver

MECHANICAL DISASSEMBLY (Continued) 2.6 Detach the wiring harness connector from P1 on the PCB. 2.7 Loosen the 3 large phillips head screws at th

MECHANICAL DISASSEMBLY (Continued) 5. To remove the home position sensor: 5.1 5.2 5.3 Remove the sensor PCB screw. De-solder the wire connections from

MECHANICAL DISASSEMBLY (Continued) 8. To remove printer drive belt: 8.1 Position the carriage at the center of the unit to allow access through th

MECHANICAL DISASSEMBLY (Continued) 10. To remove the platen cover: 10.1 Remove the 2 cover screws, as indicated. Lift the cover off of the platen. 11

----------------------~--- -MECHANICAL DISASSEMBLY (Continued) 12. To remove the paper roller assembly: q tl G 12.1-(1 ~ 12.1 Remove the 2 paper h

MECHANICAL DISASSEMBLY (Continued) 15. To remove the FPC cable assembly: 15.1 Remove the cable assembly screws. 15.2 Lift the FPC cable bracket from

MECHANICAL DISASSEMBLY (Continued) 18. To remove the platen and paper guide: 18.1 Remove the "E" clip from the platen shaft. 18.2 Pull the

SPECIFICA TIONS • 1526 • MPS 802 • 4023 • PRINT METHOD • Bi-directional impact dot matrix CHARACTER MATRIX • 8 X 8 Dot Matrix CHARACTERS • Up

CASEWORK -MECHANICAL ASSEMBLIES Section 1. Casework/Power Supply REF. NO. 1-1 C 31458001 1526/802/4023 SOUNDPROOF COVER C 31458101 1526 TOP CASE 1-

SECTION 2. Mechanical Assemblies 2-1 REF. NO. C 31458601. 1526/802/4023 PRINT HEAD ASSY ~-' 1-Print Head 2-Flexible Cable 2-2 C 31458701 1526/8

(:: commodore COMPUTERS DOCUMENT REGISTRATION Date: M anual Name: Part Number: Issue Dat e: The return of this information is essential to the m ain

Service Documentation COMMODORE BUSINESS MACHINES C-2654 West Chester, PA 19380 PLACE STAMP HERE

FOLD FOLD 2 c~ commodore COMPUTERS DOCUMENT CHANGE RECOMMENDATION THIS FORM PROVIDES OUR CUSTOMERS WITH AN EASY METHOD OF SENDING IN DOCU-MENT CHA

- ---dlZ :3NOHd :31"<:/0 Service Documentation Fold and Tape lUI PIO~) 31"<:/1S COMMODORE BUSINESS MACHINES C-2654 West Chester, P

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SET UP AND TESTING VISUAL OBSERVATION is particularly important before attempting to repair a printer. Always check for physical damage to the mechan

SET UP AND TESTING (Continued) Paper Installation PAPER RELEASE LEV To install paper, turn the printer off, remove the paper rack and lift the soun

SET UP AND TESTING (Continued) Self Test This unit has a pre-programmed self-checking capability. The program may be used to test the print head oper

Cleaning ACCESSORIES PARTS LIST C 314597-01 C314598-01 C 314598-02 C 314598-03 C 314599-01 C 1 51 5001 -01 C 903508-04 1526/802/4023 1526 MPS802 4023

Functional Block Diagram Data Flow Theory The 1526, MPS 802 and 4023 printers are functionally the same, with the exception of the interface circuits.