manualshive.com logo in svg

Tandy 1000SX, Technical Service Data

Share
Download
Tandy 1000SX Technical Service Data Download Page 1

Summary of Contents for 1000SX

Page 1: ...NY COMPUTERFACTS Technical Service Data TANDY MODEL 1000SX COMPUTER FEATURES COMPLETE SCHEMATICS PRELIMINARY SERVICE CHECKS TROUBLESHOOTING TIPS EASY READ WAVEFORMS REPLACEMENT PARTS LISTS SEMICONDUCT...

Page 2: ......

Page 3: ...OLS Head Cleaning Equipment Contact and Switch Cleaner non spray type Phillips Screwdriver Flat Blade Screwdriver 1 4 Socket IC Insertion and Removal Tools 20 24 and 40 pin 14 16 28 Low Wattage Solder...

Page 4: ...J13 J12 J11 J9 S OV 1 t 8B 4 77MHz N0RMAL 7 16MHz TURB0 J6 12 U51 B31 A31 B31 A31 B31 A31 B31 A31 831 A31 SEE SWITCHES S2 AND JUMPERS U41 ROM 1D VIDEO SYSTEM 4C RAM 128K v U3B CPU U35 3EU E4F lE3 U24...

Page 5: ...PRELIMINARY SERVICE CHECKS Continued LOW NORMAL HIGH TURBO J4 R26A J1 RAM RAM BANK1 BANKO VI III...

Page 6: ...s and 1 IC s U1 thru U16 KEYBOARD A Keyboard dead Check Connector J4 on the System Board for good connec tions B Check the Keyboard cable and check Connector CN on the Keyboard for good connections C...

Page 7: ...OWER SUPPLY REMOVAL Unplug Power Supply Connectors from System Board and Disk Drives Remove rear panel Remove four screws from rear holding Power Supply to chassis and lift Power Supply out of chassis...

Page 8: ...PRELIMINARY SERVICE CHECKS Continued LOW NORMAL HIGH TURBO J4 R26A J1 RAM RAM BANK1 BANKO VI III...

Page 9: ...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 10: ...the top of the screen The manufacturer also supplies Disk Basic on diskette To load Disk Basic first boot up DOS Insert a diskette with Disk Basic pro gram on it Type BASIC and press the RETURN key o...

Page 11: ...PRELIMINARY SERVICE CHECKS Continued CHASSIS BOTTOM VIEW HEADS SPINDLE mk CHASSIS TOP VIEW IX...

Page 12: ...ting 15 thru 20 o CO o C CO o S 1 o o W X PJPw Howard W Sams 4 Co 4300 West 62nd Street P O Box 7092 Indianapolis Indiana 46206 U S A The listing of any available replacement part herein does not cons...

Page 13: ...E J4 CI 111 33pF C1131 33pF Y 2 B J4 7 J R 8 D J4 C1151 33pFl ciibI 33pF CIhI 33pFl S FBI 3 J4 001 T _L J J4 9 S OV 00 NC part of le RP3 10K 10K f 10K 10K 10K S T4 10K IQtf CU2i 33pF A PHOTOFACT STAND...

Page 14: ...100 c A PHOTOFACT STANDARD NOTATION SCHEMATIC with HEH3HH31 Howard W Sams Co 1987 46...

Page 15: ...V 7 8 NC AOO AOI 1000 1001 1002 1003 I0D4 10D5 1006 1007 NC NC 38 P 16 PPINT FDCDACK PRINTCS SYSRST I OR IOW FDCTC DMATC TC 27 H 1 H 23 H 31 H 28 H 23 P 30 L 22 P 24 L 25 20 if 40 1 5V 10fis OV 807506...

Page 16: ...3 A C074HCT02E PART 0FUS3 RHOTO CIRCUITRACE SCHEMATIC CIRCUITRACE CABLING TUBE LINES REDUCE USE OF MULTIPLE LINES A PHOTOFACT STANDARD NOTATION SCHEMATIC w th HEHSEHH Howard W Sams Co 1987 44...

Page 17: ...S I AOO A3T AOT a30 A02 A29 A03 a28 A04 a27 AOS A26 A06 A25 A07 A24 A08 A23 A09 A22 ATO A21 AIT JA20 9 AT a AT 7 ATS JT T5 AT 4 13 T2 fA9 CAB A7 f A6 I A4 A3 U 07 JA2 I DACK3 CBT5 __ B2s BT7 bis I I B...

Page 18: ...SA1441 7 Q412V RE6 r MAKEN FOM COMMON TIE POINT PHOTO CI RCU TRACE SCHEMATIC CI ROM TRACE Oj COMPUTER o c o CO o m i 5 o o CO X TO COMPUTER POWER SUPPLY 42 A PHOTOFACT STANDARD NOTATION SCHEMATIC Howa...

Page 19: ...M74LS04P PART 0FH2 m s ovan HI 5 ovan KEYBOARD 8 A PHOTOFACT STANDARD NOTATION SCHEMATIC WITH HESffiEEBl Howard W Sams Co 1987 T C M P u T E R PHOTO CIRCUITRACE SCHEMATIC CIRCUITRACE QT...

Page 20: ...I YO X2 Y1 X3 Y2 A Y3 B V GND Z U25 INTERFACE TOP VIEW SELECT ENABLE A V VCC b Y0 B 1 C Y1 62A Y2 S2B Y3 81 Y4 Y7 YS 6N0 Y6 V U19 DECODER TOP VIEW U21 U54 USB US7 BUFFER TOP VIEW DB048C TO VCC XTAL 1...

Page 21: ...i ii W iii afer li s R S ii IN ft I I mm mm s 3 j ci i A 4 5 6 7 J 8 J 9 10 t 11 12 J 13 14 15 J 16 17 18 J 19 MM S fci sis U 1 t j t C i ft 4 i iillll 20 I 21 22 23 A Howard W Sams EMESSB Photo o o...

Page 22: ...1 P 11 R2 P 11 R3 P 11 R4 Q 2 R6 0 2 R7 0 3 R8 0 5 R9 0 5 R10 R 7 R11 R 7 R12 0 8 R13 0 2 R14 0 2 R15 0 3 R16 0 4 R17 0 4 R18 Q 4 R19 0 4 R20 0 4 R21 0 5 R22 0 6 R23 R 8 R24 R 8 R25 R 9 R26 R 9 R26A R...

Page 23: ...11 U53 U51 U56 12 0V A 12 0V 5 0V A SOURCE SOURCE SOURCE NOTE ARROWS ON IC S INDICATE PIN 1 UNLESS NOTED 2 3 B C E V R2 mm VR1 Q3 5 0V SOURCE o o SYSTEM BOARD 12 A Howard W Sams MI MIIH MJS Photo SYST...

Page 24: ...ey or type BASICA and press the RETURN key to load Disk Basic To return to DOS from Basic type SYSTEM and press the ENTER key To view a list and the names of programs on a diskette in the current Driv...

Page 25: ...screws from rear holding Power Supply to chassis and lift Power Supply out of chassis SAFETY PRECAUTIONS 1 Use an isolation transformer for servicing 2 Maintain AC line voltage at rated input 3 Remov...

Page 26: ...ircuit WARNING Defeating shutdown may allow high voltages and currents to occur that may do further damage to Power Supply Use a current limiting voltage stepdown AC Power Supply to supply AC power to...

Page 27: ...nd 27 thru 34 of Keyboard Con trol I er IC Ml on the Keyboard If the wave form Is missing at pin 22 check the 6 0MHz Crystal XL and IC Ml If any of the other waveforms are missing check IC Ml If the w...

Page 28: ...check IC U53 If pulses are present check for the waveform shown In Figure D at pin 4 of j IC U17 If waveform is not correct check f Transistors 01 and 02 Zener Diode CR1 CapacI Ji tor C1 18 and Resis...

Page 29: ...20 SCREEN 0 1 WIDTH 80 30 KEY 0FF CLS 40 FOR Y 1 TO 3 50 READ C OOL0R 0 C 60 FOR X 1 TO 160 70 PRINT 80 NEXT X NEXT Y 90 GOTO 90 The program puts blue green and red horizon tal bars on the Monitor scr...

Page 30: ...serted If pulses are missing refer to the Index Sen sor section of this Troubleshooting guide While the above program is running check for pulses at pins 4 19 25 30 31 and 32 of Floppy Disk Controller...

Page 31: ...unning check for a logic Low at pins 30 and 34 of Interface IC CU22 and pins 2 and 6 of IC U49 If readings are not correct at pins 30 or 34 check IC U22 If readings are correct at pins 30 and 34 and n...

Page 32: ...LU LU LU LU LU UJ o no ON CD O UJ KN ON CN O o LU o C o CO 2 o 2 i z o o CO o CO UJ h in in in LU LU LU I I I z z z 00 ON ON in in in in LU LU LU t l h z z z NO vO ON LU HI c CN UJ o X o oo co _i o oo...

Page 33: ...Xi CC a ON On ON ON tn m o o in in CM CM ro t i in m m in oo co O O CD CD CD CD 88 CD CD o o oooo OO UJ UJ LU UJ UJ UJ UJ UJ UJ UJ d ujZ 1 t Z CC ON ON ON ON mtn o o in m CM CM i n in tn tn tn CO CO...

Page 34: ...t ft ft ON Ov 01 OOCDOOC5 oooooo LU LU LU LU LU LU to to to CM CM CM CO CO CO cd a co OOO LU LU LU o C o CO o m z o o CO X ff ft ft ff ft ft CM CM CM CO CO CO _I _J J ft ft ff LULU LU CD co 03 CMJiOvS...

Page 35: ...l _l _l v si 3 t r r r i r r r r ao o CC CO C OO CD a ooo LU LU LU OOO LU UJ LU ooo LU LU LU in in in 1 r i t i r r o CM CM CM kn f 1 1 1 H Z OC to to to to to to o o 0 I I I _l J _ w t st 1 1 r f i i...

Page 36: ...COCO I I I r r p CD O CD OOO UJ UJ UJ 3 CM CM CM co co co J _l _1 r r r OOO OOO UJ UJ UJ r 1 r 1 1 r o o o 000 000 UJ UJ UJ UJUJ UJ 1 1 I in in in r CM CM CM co co co 1 I I sf S r r r UJ UJ UJ H t t z...

Page 37: ...RS Power and Special ITEM No RU1 RATING KEYBOARD Resistor Network POWER SUPPLY BOARD R1 NTC 8 Cold SYSTEM BOARD R13 82 5K 1 4W Metal Film RP1 Resistor Network RP2 Resistor Network RP3 Resistor Network...

Page 38: ...250V Fast Acting MT4 3A 250V P 5 722113 SPEAKER ITEM No TYPE REPLACEMENT DATA l NOTES MFGR PART No QUAM PART No SP1 3 SO PM 8 Ohms 849001 30A05Z8 MISCELLANEOUS ITEM No PART NAME MFGR PART No NOTES KEY...

Page 39: ...LO 3 5f c CO HI CM dr i M tn zt oo CM QQ C3 Immmil ImLmI C3 POWER SUPPLY 28 A Howard W Sams E3EB3Sffli photo...

Page 40: ...6 R17 R18 R19 R20 R21 R22 R23 R24 R25 C 1 E 1 G 2 F 3 G 3 E 3 A 9 F 4 B 11 E 5 B 4 B 6 C 6 F 5 A 13 D 10 C 10 C 1 E 1 1 E 1 E 1 2 E 1 F 12 F 13 C 1 2 F 1 A 4 E 5 B 4 B 6 F 5 F 5 C 9 E 9 G 11 A 13 F 6...

Page 41: ...P P P P H L 14 P P P P P P P P P H H P 15 P P P P P P P P L H H 16 L L L L L L L L P H P 17 P H 18 P P 19 P H 20 H H PIN IC PIN IC PIN IC PIN IC PIN IC IC IC NO U22 NO U22 NO U23 NO U23 NO U24 U25 U2...

Page 42: ...57 P 17 H 37 P 57 P 18 L 38 P 58 P 18 H 38 P 58 P 19 P 39 P 59 P 19 P 39 P 59 P 20 L 40 P 60 P 20 P 40 P 60 P S O 2 i o PIN IC PIN IC PIN IC IC PIN IC PIN IC IC IC PIN IC NO U30 NO U30 NO U31 U33 NO...

Page 43: ...12 P P P 32 12 P P 13 P P 33 L 4 13 P P P 33 13 P P 14 P P 34 L 14 P P L 34 14 P P 15 P P 35 H 15 P P P 35 15 P P 16 H P 36 K 1 16 P P P 36 16 P P 17 P 37 L 1 17 P P P 37 17 P P 18 P 38 L 6 18 P P P 3...

Page 44: ...2 P 12 P P L 32 P 12 P P 13 P 33 P 13 P H P H 33 P 13 P P 14 P 34 H 14 P H P H 34 P 14 P P 15 H 35 H 15 P P L 35 P 15 P P 16 P 36 H 16 P P H 36 P 16 P L 17 P 37 H 17 P L H 37 P 17 P P 18 P 38 P 18 P P...

Page 45: ...ishes Memory or I O MEMIOS Memory Input Output Select MEMR Memory Read MEMW Memory Write MOTOR ON Disk Drive Motor On MTREN Motor Enable Floppy Disk MTREN Motor Enable Floppy Disk MTRON Motor On Disk...

Page 46: ...o m fe z A Howard W Sam HIMUHJ HmI Photo POWER SUPPLY 35...

Page 47: ...o LU h O z 00 CO at z 3 a LU i o 00 o z o CO o QC c ui r o z KEYBOARD 36 A Howard W Sam wM HftjVH p h...

Page 48: ...11 U53 U51 U56 12 0V A 12 0V 5 0V A SOURCE SOURCE SOURCE NOTE ARROWS ON IC S INDICATE PIN 1 UNLESS NOTED 2 3 B C E V R2 mm VR1 Q3 5 0V SOURCE o o SYSTEM BOARD 12 A Howard W Sams MI MIIH MJS Photo SYST...

Page 49: ...on DIP Switch S2 set On Voltages measured with digital meter Waveforms and voltages taken from ground unless noted otherwise Supply voltage maintained as shown at Input Controls adjusted for normal o...

Page 50: ...i ii W iii afer li s R S ii IN ft I I mm mm s 3 j ci i A 4 5 6 7 J 8 J 9 10 t 11 12 J 13 14 15 J 16 17 18 J 19 MM S fci sis U 1 t j t C i ft 4 i iillll 20 I 21 22 23 A Howard W Sams EMESSB Photo o o...

Page 51: ...23 TIMER TOP VIEW HC14529B STRBX VCC XO STRBY XI YO X2 Y1 X3 Y2 A Y3 B II GNn Z U25 INTERFACE TOP VIEW A VCC fl I C 5 Y1 62A Y2 62B Y3 81 Y4 Y7 Y5 GND Y6 Y U19 DECODER TOP VIEW SN74LS244N V U21 U54 US...

Page 52: ...2 O P o o w S 1 S U1 1 BLOCK DIAGRAM 41...

Page 53: ...Ofw3 12 0V 2SA1441 rn Q412V RE6 A7AKEN FOM COMMON TIE POINT PHOTO CI RCU TRACE SCHEMATIC C1RCU1 TRACE TT TO COMPUTER POWER SUPPLY 42 A PHOTOFACT STANDARD NOTATION SCHEMATIC with raronnrcra Howard W S...

Page 54: ...CS C47 THRU C57 220pFT CI 49 CI SO C110 01 C4Q C131 C132 C136 47 S5 0VMS I SOURCE C12S1C242 THRU M44T CI 37 THRU C142T C249 C251T 1 C2B5 C9B FBI C157A C158 001 C26S CSS 0022 ci66 ciia CI 51 CI S7 22 i...

Page 55: ...3 A C074HCT02E PART 0FUS3 RHOTO CIRCUITRACE SCHEMATIC CIRCUITRACE CABLING TUBE LINES REDUCE USE OF MULTIPLE LINES A PHOTOFACT STANDARD NOTATION SCHEMATIC w th HEHSEHH Howard W Sams Co 1987 44...

Page 56: ...V 7 8 NC AOO AOI 1000 1001 1002 1003 I0D4 10D5 1006 1007 NC NC 38 P 16 PPINT FDCDACK PRINTCS SYSRST I OR IOW FDCTC DMATC TC 27 H 1 H 23 H 31 H 28 H 23 P 30 L 22 P 24 L 25 20 if 40 1 5V 10fis OV 807506...

Page 57: ...100 c A PHOTOFACT STANDARD NOTATION SCHEMATIC with HEH3HH31 Howard W Sams Co 1987 46...

Page 58: ...MOD Si X w Q o CO O CO o A PHOTOFACT STANDARD NOTATION SCHEMATIC WITH Howard W Sams Co 1987 TANDY MODEL 1000SX 47 4U m...

Page 59: ...of any available replacement part herein does not constitute in any case a recommendation warranty or guaranty by Howard W Sams Co as to the quality and suitability of such replacement part The numbe...

Page 60: ...NC NC NC 25J iL 22J J2 4 F6 2 TL J2 3 A PHOTOFACT STANDARD NOTATION SCHEMATIC with BBgni Howard W Sams Co 1987 TANDY MODEL 1000SX...

Page 61: ...rogram Is running check for a logic High on the Write gate pin 24 of Connector J1 on the Disk Drive Board to verify the Disk Drive is In read mode If reading Is not correct check the Disk Drive Interf...

Page 62: ...number 16 on the Monitor screen to indicate the head is on Track 00 If the head Is manually pushed off Track 00 the number should change to the number 0 DRIVE A 40 FOR T 1 TO 500 NEXT T 50 OUT 1014 1...

Page 63: ...pulses at pins 4 thru 7 of Motor 100 GOTO 10 Driver I C U7 If pulses are missing check Drive Controller IC U3 If pulses are pres DRIVE B ent check for pulses at pins 10 thru 13 of IC U7 If pulses are...

Page 64: ...F 1 J6 C 10 J7 A 2 J9 G 1 L3 C 5 L4 B 3 L5 A 4 Q3 F 9 R1 E 3 R5 K 5 R6 K 7 R9 G 4 R11 F 4 R13 E 3 R14 D 2 R15 D 3 R16 C 3 R20 D 10 R21 D 11 R22 A 4 R23 B 8 RA1 L 9 RA3 J 5 RA4 1 5 RA5 K 9 RA6 1 10 RA7...

Page 65: ...A 3 0 A 0 XI c a E o a JS Q o a a 0 to o d a CD 7Z o I o I LU 0 w LU o z 1 t n 6 fc a d C3 Z a CN o CN CD O LU d Z DC a NTE2072 MFGR PART No TYPE No M2167 1 SS233F DTA144EF LH5060B NB2803P BA6581K M54...

Page 66: ...PART No CONTROLS All wattages 1 2 watt or less unless listed ITEM NO FUNCTION RESISTANCE MFGR PART NO NOTES R1 DISK DRIVE Balance 20K RESISTORS Power and Special ITEM No RATING REPLACEMENT DATA MFGR...

Page 67: ...ss noted 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Probe indicates P when head is moving Probe Indicates L when head is selected H when head 1 is selected Probe Indicates H when head is selected L when head 1...

Page 68: ...Drive motor on the bottom of the Disk Drive see Figure 1 Insert a diskette Into the Drive and close the door Type In and run the program 1 1 sled under Continuous Operation of Disk Drive to keep the...

Page 69: ...e Disk Drive and adjust the Board for 200ust200us see Disk Drive Mechanical Top View Photo If side checks good select side 1 and repeat the above procedure to check Head 1 Figure 3 Connect the channel...

Page 70: ...c U5 U3 U7 03 U4 12 0V 5 0V C NOTE ARROWS ON IC S INDICATE PIN 1 UNLESS NOTED A Howard W Sams MhMHH W Photo 12...

Page 71: ...LE061 5 0V C o m z LOCATED ON OTHER SIDE OF THE BOARD A Howord W Scms MTWUirEreS Photo 13...

Page 72: ...TRACK 00 SCfiEW 12 PQ51 I IMI mm INDEX SENSOR SCREWS m It 11 iH MNINi B CHASSIS TOP IEW 14...

Page 73: ...L 8 31 H 11 P 31 H 2 12 HC1 32 L 12 P 32 H 13 H 33 L 13 H 5 33 P 14 H 34 L 14 L 4 15 L 10 35 H 15 L 16 L 36 P 16 H 17 H 7 37 P 18 H 1 38 H 19 P 39 P 20 L 40 HC11 TERMINAL GUIDES 2 h2h hsn2g 5 2 P lom...

Page 74: ...f RADIAL ALIGNMENT SCREWS v jmmmmm 7 TP8 ii TP7 f i i jj JS TP3 1 PHASE Ai I ADJUST I 1 R1 TP1 mm 1 1 ft CHASSIS BOTTOM VIEW 16...

Page 75: ......

Page 76: ...as on a CJj 1 J5 Ml c n q E o on 3 O 3 u ss w ii s 3 5 c e c 0 s c 3 C _ os i en U e j X ri 3 c a E J c o nS z 3 D _ UJ H c 3 M C o M5 a v J c e 5b u i5 c u c 53 3 j BJ E o 4S u r C o o 3 S3 u E 3 r5...

Reviews:

No comments

Brands by name

Popular brands

Load more brands