Tandy 26-2814 Technical Service Data Download | Manualshive

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Summary of Contents for 26-2814

Page 1: ...COMPUTERFACTS Technical Service Data TANDY MODEL DMP132 26 2814 PRINTER FEATURES COMPLETE SCHEMATICS PRELIMINARY SERVICE CHECKS TROUBLESHOOTING TIPS EASY READ WAVEFORMS REPLACEMENT PARTS LISTS SEMICON...

Page 2: ...ools 28 pin Low Wattage Soldering Iron Desolderlng Equipment SAMStm 4300 West 62nd Street P O Box 7092 Indianapolis Indiana 46206 U S A The listing of any available replacement part herein does not co...

Page 3: ...ON y POINT J22 3 D202i B 1C Q102 POWER SUPPLY ON OFF POWER SWITCH o TO CN9 CN9 5 B LINEFEED GEAR ASSEMBLY CN9 CN9 4 UNEFEED MOTOR TO CN8 TO CN3 AND CN4 TO CN6 PAPER EMPTY SWITCH TO CN7 1 V PAPER SET S...

Page 4: ...PRELIMINARY SERVICE CHECKS Continued tltitiiiiifiiiiiii MAIN LOGIC BOARD 0 0 MAIN LOGIC BOARD X MAIN LOGIC BOARD III...

Page 5: ...ting To select the character pitch using the front panel set the printer In On Line Mode Press and hold the pitch ON OFF Line switch until the 0 Llns Indicator blinks Press the LINE FEED or FORM FEED...

Page 6: ...r feed turn the printers power switch OFF remove the paper rack and open the printer coyer Place the front pins Into the holes then push down on the rear of the tractor unit until the tractor Is secur...

Page 7: ...pulley plate block In place Check the widths of printed characters at the first and second columns If the widths of characters are improper it Is required to readjust the tension of the timing belt TO...

Page 8: ...de B Check carriage motor connector CN8 for good connection C Check the carriage motor windings resistances Check for 50 ohms for each winding D Check the carriage motor by substi tution E Check the M...

Page 9: ...PRELIMINARY SERVICE CHECKS Continued v FRONT CONTROL PANEL...

Page 10: ...PRELIMINARY SERVICE CHECKS Continued s i O Q g H 3 2 z 3 0 I ill Wmmm mm mm Mi 1 CHASSIS OVERALL VIEW K...

Page 11: ...PRELIMINARY SERVICE CHECKS Continued Pa w r twavNsw V V IMllfMa m j v iS so v g f i V If ft tj l s slP jsll C f 2M 3EI f 41 MAIN LOGIC BOARD liS...

Page 12: ...ON y POINT J22 3 D202i B 1C Q102 POWER SUPPLY ON OFF POWER SWITCH o TO CN9 CN9 5 B LINEFEED GEAR ASSEMBLY CN9 CN9 4 UNEFEED MOTOR TO CN8 TO CN3 AND CN4 TO CN6 PAPER EMPTY SWITCH TO CN7 1 V PAPER SET S...

Page 13: ...onnectors and contacts DISK DRIVES Clean the read write heads of the Disk Drives about once a month or after 100 hours usage Use only an approved head cleaning kit Handle carefully to preserve proper...

Page 14: ...Notes 26 Switches and Jumpers 8 9 Test Equipment 10 Troubleshooting 11 SAMS Howard W Sams Co im 4300 West 62nd Street P O Box 7092 Indianapolis Indiana 46206 U S A The listing of any available replac...

Page 15: ...PHOTO CIRCUITRACE SCHEMATIC CIRCUITRACE pTT A PHOTOFACT STANDARD NOTATION SCHEAAATIC WITH NINIIIlMJJ Howard W Sams Co Inc 1989 TANDY MODEL DMP1 32 26 281 4...

Page 16: ...j 7 M3 PRINT HEAD cl PIN1 33 P1N2 33 4 f PIN3 33 PIN4 33 P1N5 33 t _ P1N6 33 P1N7 33 i _ INB CN11 8 33 Q P N9 k 33 J m 24 0V CABLING HEAVY LINES REDUCE USE OF MULTIPLE LINES PHOTO C1RCUITRACE SCHEMATI...

Page 17: ...sufficient to damage semiconductor devices 9 This Printer is equipped with a grounded three pronged AC plug This plug must fit into a grounded AC power outlet Do not defeat the AC plug safety feature...

Page 18: ...o o o o Sec Sec Sac oa z r TO CNtn rvitn ojtn tfl o S 03 E RR 7 0 o a m p 2 2 z 3 w to ro 00 A PHOTOFACT STANDARD NOTATION SCHEMATIC with HEHEZE1 Howard W Sams 8 Co Inc 1989 I P H POWER SUPPLY...

Page 19: ...4 C 23 R5 E 25 R6 D 25 R7 C 26 R8 D 24 F 24 D 19 M 22 B 12 H 2 G 3 1 1 1 E 1 1 R10 R11 R12 R13 R14 R15 R16 R17 R18 B 22 B 25 A 26 A 23 B 25 B 20 B 23 1 20 M 17 J 21 R19 R20 R21 R22 R23 R24 R25 R26 R27...

Page 20: ...I iitiiiliiiittii NOTE ARROWS ON IC S INDICATE PIN 1 UNLESS NOTED o O Q I g 3 i S 0 24 0 MAIN LOGIC BOARD 22 A Howard W Sam HmSD l c MAIN LOGIC BOARD...

Page 21: ...To select the character pitch using the front panel set the printer in On Line Mode Press and hold the pitch ON OFF Line switch until the On Line Indicator blinks Press the LINE FEED or FORM FEED swi...

Page 22: ...all the tractor feed turn the printers power switch OFF remove the paper rack and open the printer cover Place the front pins Into the holes then push down on the rear of the tractor unit until the tr...

Page 23: ...to remove it Dis connect the line feed connector CN9 from the logic board Remove the line feed motor from the printer POWER SUPPLY BOARD REMOVAL PRINT HEAD REMOVAL Remove the Top Cabinet Remove two sc...

Page 24: ...OTOR Check the platen for smooth operation without binding Turn on Printer and set the Printer Off line Then press Form Feed Check waveforms at pins 6 8 10 and 16 of Motor Drive IC TAD Check the resis...

Page 25: ...O O UJ UJ UJ UJ 0 C 7 0 in in in in UJ UJ ui UJ i I l l z z z z KN I I rn cm o tn m o o Tt or 3 VO O p I r I cm I O 0 o o o CM O CM O O O CO if CO CO 00 Q CO o 8 o CO o I o CD X O O Q O O O lu a uj qj...

Page 26: ...JUJUIUJ o o c W Z o o o a to to to 1 t I 1 1 o o o o o o E z cc CT OS CTi m in in en cti cti mmincTiCTicTicMCM a r r r CM CM CM 00 00 00 CM CM CM COCOOOCMCMCMtOm a UJ UJ UJ UJ UJ UJ LU UJ Ul UJ UJ Ul...

Page 27: ...CD CD OO O O LU LU LU LU CD CD O O LU LU CM CM CM IO IO IO IO IO IO in in m CD CD CD O O o UJ LU LU ON ON ON r r r tO IO IO CD CD CD OOO LU UJ LU CM CM ON ON in m tn in in in LU LU LU LU LU LU vi f S...

Page 28: ...n in in in a S J 00 o o o o LU UJ Ixl UJ _____ o w z h P r S 1 I Z DC CM CM 00 00 1 O O O O m in m in 1 UJ UJ LU UJ a i_ i h z z z o d oc z z tec a s f t S 2 i CM A t QQCM N lIlLl CM 0 O U O K O Q O o...

Page 29: ...lable at local distributors RESISTORS Power and Special ITEM No RATING REPLACEMENT DATA MFGR PART No NTE PART No MAIN BOARD Resistor Array 4700 5 x 8 4700 10 x 8 Resistor Array 2200 5 x 8 Resistor Arr...

Page 30: ...ystal MFGR PART No 84684 5192 8409 18230 8409 18244 8409 07502 8409 07503 8409 14207 8409 14208 84684 50149 84687 50149 84630 1014 84684 1015 84684 1200U 84686 1 200U 8409 29001 84300 1 1 1 84300 1113...

Page 31: ...nt of the printer while holding the guide pillar Tighten the screw Run the self test and check the print quality The adjustment Is complete when the print quality Is satisfactory TIMING BELT TENSION A...

Page 32: ...he computer that the data from previous STROBE pulse has been read In or the pri nter Is ready to receive the next STROBE pulse The BUSY line will be at a logic low if the printer Is OFF line or if It...

Page 33: ...BLOCK DIAGRAM 85 20...

Page 34: ...57 P 58 H 59 H 60 IC P7 IC P8 PIN NO IC P9 P 1 P 8 L P 2 P 7 P H 3 3 H L L 3 4 H H H 5 H 3 L 6 H 3 L 7 P H H 8 H 9 H L 9 P 10 H L 3 10 P 11 H H 3 11 P 12 H P 12 P 13 H P 13 P i 14 H H 14 P 15 15 P 16...

Page 35: ...Iftlllltlllllftll 12 0V NOTE ARROWS ON IC S INDICATE Pill 1 UNLESS NOTED r g H IO I bo v Dv MAIN LOGIC BOARD 22 A Howard W Soms SSI Phrt OGIC BOARD...

Page 36: ...R4 C 23 R5 E 25 R6 D 25 R7 C 26 P 8 U 24 R9 F 24 RIO D 19 R11 M 22 R12 B 12 R13 H 2 R14 G 3 R15 1 1 R16 1 1 R17 E 1 1 R18 E 22 R19 B 25 R20 A 26 R21 A 23 222 B 25 R23 B 20 R24 B 23 R25 1 20 R26 M 17 R...

Page 37: ...1 150 149 3 48 3 47 MS 145 144 143 3 42 141 140 139 138 137 3 3S 135 134 133 P2 P9 TOP VIEW c yc EC EC 7C S EC IOC nc 12C 13C 4c 326 327 326 32S 324 323 322 321 320 319 3 8 317 31 315 HA IN BOARD I DE...

Page 38: ...201 D 1 R110 D 8 CI 04 G 2 CN1 H 12 PC101 C 10 R201 K 12 C105 1 4 D101 F 6 0101 K 5 R202 J 10 CI 06 J 4 D102 1 5 0102 E 8 R203 D 11 CI 07 D 8 D103 E 7 R101 G 4 R204 D 12 CI 08 F 7 D104 E 7 R102 J 3 R2...

Page 39: ...forms Switch to AC input to view waveforms after DC reference is measured when necessary Each waveform Is 10cm width with Measurements with switching as showra s unless DC reference voltage given at t...

Page 40: ...FRONT CONTROL PANEL 27...

Page 41: ...ill CHASSIS OVERALL VIEW 28...

Page 42: ...rt H f S a ft i 5 to POWER SUPPLY BOARD 29...

Page 43: ...UJ E z D102 D103 D201 1 501 thru D503 5 U 3 u s I s 6 a H eg llI Sso 1 5 5 S 0 o H 05 yj CL rt I O oo o g o ex in 2 V o a u 5 I OS to 5 Q C 3 5X 53 O 5 O b U C 5 5B a m a a o S o s a C C3 35 an 8 b fi...

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