Sharp MZ-80A, Service Manual

Page 1: ...elf a simplified unit including CPU board CRT display casse tte tape recorder and keyboard all together The keyboard touch will satisfy professional operators and numerical input keys are provided Speaker 3 octaves and clock function are built in A video RAM of 2K bytes is provided to facilitate edition aided by CAT display Memory extensions is allowed up to 4BK bytes in the board Four types of I ...

Page 2: ...ply section 19 Circuit diagram and printed wiring board 21 Disassembled view 35 Packing method 39 Replacement parts list 40 Caution in Service it Maintain the safety and protecting ability of the apparatus after serVice it High voltage shall not be rised to excess voltage so as to prevent this apparatus from the extra X ray radiation ...

Page 3: ...on Approx 36W Data transfer speed 1200 bits sec Temperature Operating temp O C to 35 C Data transfer system SHARP PWM Storage temp _15 C to 60 C Sound output 400mW max Humidity Lower than 80 during operation Keys layout Number 73 keys Weight Approx 10kg ASCII standard Width 440mm alphabet capital letter figures Dimensions Depth 480mm Small letter Graphic 10 Numerical Height 260mm CPU Board Section...

Page 4: ...Horizontal Control knob Volume lock in range 300 Hz 100Hz limit Brightness Vertical lock in raniJe 12 Hz 6 Hz limit Working Audio 440 Hz OdB 10 C to SOOC friquency lOdB 4dB at 100 Hz temperature characteristic 12dB 4dB at 10kHz Sound maxi 400mW at 440 Hz mum output Cassette tape recorder Section System PWM recording Biasing DC system Power source SV 0 25V rated Erasing DC system Rated amperage Wai...

Page 5: ...ow to find which section of the machine is subjected to the trouble and next to do the checkings according to more detailed instructions given in the succeeding pages Start Switch on Yes Yes Is the cassette ecorder normal Yes Yes Yes End No No No No No 3 Check for the power supply circuit Check for the CRT display Check for the cassette recorder Check for the keyboard Check for the CPU board ...

Page 6: ...eyboard block Audio block Clock block No Gets in trouble instantly with power on No Yes Yes Yes Yes Yes Yes Checking methods of each circuit Check for video RAM circuit Check for IC50 8255 and its peripheral parts Check for IC50 8255 and its peripheral parts Check for IC47 8253 and its peripheral parts Check for IC47 8253 and its peripheral parts Memory circuit Reset circuit and its peripheral par...

Page 7: ...deo RAM L 1 1 Display Oscillator V controller circuit Address selector C D T Block Diagram of Parts around Video RAM Vertical sync signal Check for pin of IC20 Horizontal sync signal Check for pin00f IC20 Is V GATE signal for pin of IC2 high level Yes IC2 No IC50 Is V BLANK signal present at pin of IC20 Yes IC20 No IC2 Is H BLANK signal present at pin CD of IC20 Yes IC20 IC31 No IC2 Does pin of IC...

Page 8: ... I Keyboard H I i A _______ J Block diagram of Parts around Cassette recorder Keyboard 1 LOAD operation is impossible 2 SAVE operation is impossible 3 Motor doesn t rotate 4 Motor doesn t stop 5 Key input is ineffective Is output signal present at pin Q of IC10 Yes IC50 No IC10 Is output signal present at pin of IC50 Yes ICl 0 No IC50 Is voltage at pin of IC39 at Iow level Yes IC4 01 No IC39 IC5 I...

Page 9: ... Oscillator circuit for Tempo L _ _ _ _ _ 4 DO Block Diagram of Parts around Audio Clock Block 1 Abnormal sound output 2 Clock function is abn ormal r __________ ___ Is output signal present at pin of IC47 Yes IC45 IC48 No 1C47 IC51 Is 31 5KHz signal input to pin of IC47 Yes 1C47 8253 and surrounding are faulty No IC20 Check if 8MHz signal is supplied to pin of IC20 7 ...

Page 10: ... Circuit 1 Reproduced picture shows panic 2 Error display or misoperation is caused as a result of program execution 3 Returns to MONITOR SA 1510 4 Error is caused after a long operation Check for the following ROM IC46 CG IC13 CPU and surrounding circuit Address bus line Data bus line Control line RAM by using RAM checker RAM check RAM check RAM check 8 ...

Page 11: ...35B 00 01 An error is caused in the addresses 2000s namely although data 00 has been written in the address 235B its read out data is 01 2 RAM TEST 2 Write read test is carried out with the following data a Write in data 00 from the address 1000 to the maximum address b Write in data F F from the address 1000 to the maximum address c Write in data 00 from the maximum address to the address 1000 d ...

Page 12: ...3 I 5 I 14 I 6 I 15 I 7 I 16 I 8 I I I I I I I I I _ _ 05 04 0 0 0 0 03 02 01 0 0 0 0 0 0 RAM I 1000 4FFF RAM Il 5000 8FFF RAM Ill 9000 CFFF 00 IT Error to occur Wave form of Each Pin of CPU Board At pin 11 of le 20 31 5 KHz At Pin 4 of le 3 At Pin 8 of le 11 Horizontal Blanking Signal At Pin 10 of le 50 Vertical Blanking Signal 1 At Pin 10 of le 20 Vertical Sync Signal 10 At Pin 4 of le 3 ...

Page 13: ...I I I I I I I I 05 o o 04 o o 03 02 01 o o RAM l o o o o 1000 4FFF RAM Il 5000 8FFF RAM Ill 9000 CFFF DO Error to occur Wave form of Each Pin of CPU Board At pin 11 of IC 21 31 5 KH At Pin 4 of IC 3 T At Pin 8 of IC 11 Horizontal Blanking Signal AtPin 10 oflC20 Vertical Sync Signal l I At Pin 10 of IC 50 Vertical Blanking Signal At Pin 4 of le 3 _________ 1 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ...

Page 14: ...rt circuit To audio circuit Horiz sync signal To horizontal circuit To FBT circuit To CRT heater Vert osc amp output amp IC2001 tttV HOLD V LlN V SIZE AFC H Horiz 02003 osc 02004 02004 H HOLO Volume Horiz drive 02005 Audio signal amp IC2002 Video signal Horiz output 02006 Block Diagram of Display Section I IIO Speaker Cl0M36P31 or E2728B31 9 HV H Middle voltage FOCUS F B T c J C en I o z ...

Page 15: ...nor separation 02001 vertical sync and 020031 operation is llsthere r ineffective sync Check integrating signal Only vertical Circuit R2030 to R2023 Yes sync operation and C2011 to C2013 is ineffective Only horizontal Check AFT circuit 10 sync operation Check point j output of is ineffective FBT R2030 C2021 R2033 R2055 and C2055 Problem 3 Raster is too narrow N Chcek V HOLD VR I Check C2010 and R2...

Page 16: ... fr 1 r 12r 1V 20l s 20l s 2ms Vertical oscillator Circuit Vertical output waveform Vertical drive collector waveform 1 l u Tn l T O LJ IV if t ov 5ms 1 SV 5ms Voltage at pin of RH IXOO15 Vertical deflection coil voltage waveform Vertical linearity circuit waveform l ID ltJl f 1 1 5Vpp 1 5Vpp 8Vpp L I t lJ J 5ms 5ms Sms Horizontal sync SIgnal waveform AFC waveform FBT waveform 1 1 ffl n 1 l T 4V 7...

Page 17: ...l oscillator emitter waveform Horizontal oscillator output waveform tT 20 j 5V OV 20 s 2O s Horizontal output base waveform Horizontal output pulse 5V lM 20 20 s Middle voltage FBT pulse Video power supply pulse J 2O s Audio output waveform 14 ov 2O s The figures encircled by 0 in the above refer to those of Wiring Diagram Check Points of Waveforms ...

Page 18: ...I Erase head c I Record playback head Differentia tion circuit R3005 C3002 R3005 Amplifier circuit I 03001 03002 5 v Amp circuit 03003 Amp circuit Limiter circuit IC3001 1 2 Block Diagram of Cassette Tape Recorder TAPE en en m t t m tJ m D m o o D c m D f m o 6 z g t C r 0 ill ...

Page 19: ...se of 03001 Is there any signal present at the Yes record playback head Problem 3 Playback LOAD of program is impossible or error is caused Ye Make su e of the tape I 1start POSition r r Does normal waveform arise at pin No Check for power supply 5V of CPU board And check for plug and cable 6 pins HCheck for power l No supply 5V I No Check for IC3001 r each resistor and SW3001 The waveform is not ...

Page 20: ...m J Te e r 1 SVpp 1 L Head input waveform T i 6Vpp I1 VV Operational amp input waveform Operational amp input waveform L 6mv pp 1 SV T OV Operational amp output waveform Output waveform T T 4Vpp 5Vpp I L Record amp waveform Record amp waveform l r e e r T e 4 SVpp PP 1 The figures encircled bvOcorrespond to those of Wiring Diagram Check Points of Waveforms 17 ...

Page 21: ... often to remove dust and tape residue Foreign material on them impairs the sound quality of both recording and playback Open the cassette holder remove the tape push the play button and clean them with a soft cloth moistened in alcohol Erase protection To protect a cassette tape from being accidentally erased it was designed with two removable tabs lWhen the tabs are removed it is impossible to p...

Page 22: ...cuit Block Diagram of Power Supply Section Waveforms of Each Parts Waveform of pin Waveform of pin jJ of IC401 0401 collector waveform of IC301 and IC401 vf 11 Jl1v illIL f 451l5 45115 Waveform of pin lj of IC301 0301 collector waveform I IlJlf f lJL q p 45115 45J L5 19 12V G 5V G 5V G ...

Page 23: ... Problem 4 5V is not developed Check for T1 01 Is the waveform at col lector of 0401 normal No Check for IC201 R201 C203 and C204 Check for L201 and Yes F202 Check for IC401 and its peripheral parts Check for 0401 and 0402 Leave R403 be open does there appear 0 3VI3 P pulse at pin QJl of 1C401 Check for L401 C405 and C409 Check for IC301 and its peripheral parts Is there AC 13V present across C301...

Page 24: ..._ J _ J _ J N N N 0 e N 0 g U 0 I u _N I li I I I I i I I li I 0 l L I N n to uV _ J I I I I I I to N I I I I I I I li I li f li J J 0 I f d uV uV _ J _ J t f l 0 3 o 1 o I NO I I I g 1 I lE JJJ 0 f 0 0 I Q uV uV _ J 0 u 0 u 0 g uO 1 t 1 1 1 I o 3 J JrJ I I I I at JJJJ f_U N 0 N r 0 uo u uV _ _ J J 1 1 11 1 1 1 1 f 0 r NN I i I li I 2 2 21 8 1 tt 0 oS I I I I j I I J 1 JJ 1 01 1 1 I 1 I Is t o co ...

Page 25: ...line through 3 3K ohm I c 121 O It I Mlvl Z l41C C20 B14298 r r H I e to svIlllCNI IIO Ir c o l fm _1 _vI to Y iiitiii lt 1_ IY lOO I v r MiUii l I C QM I D I IN I I 1 n 71 A I D lII D A R1t 11 CLOQ iiiiIt I Q D n try cl r Bd A I I fi I Z A 1C21 fi 10 LS283 A 11 1 Z 50 1C22 LS273 10 1 C4 10 les ii LS283 ril r r MZ 80A 2 5 n c 2 a n 0 2 Q N CD n c m T1 C t l lI rI f f t I l tt t i ...

Page 26: ... I ja e 0 0 o c f f f I f f f f f f f f f I Ic o f f f f f f r f or f f o f r o 0 o 0 I o 0 I I I I I I I I f I f I f I I I I I a f a f I f f f f f f f I l f f I l f f f l f f f f f f I f f f f f I f l f f f l f 0 I 0 g I 0 0 I 0 o f I f f f I f l f I I I f f I f f f f f f r f f f I f l f l f f I f I f f 23 o 0 o 0 I I f f f I f f f f a f a r f l f l f r f r f r f r I I f r I I 0 o I f I f I f I t...

Page 27: ...1 I 7 IHI l I g sy I lell C fOC olO k I L J 0 o I LIDO p I IC3 SlNII MOTOR IV LS74 L CK I HAIOST l fO I 100 IC It ItV C Cl RA2 OKI I I rll I I I I I I 1 r D C IC52 I 7414S I A I o I I HI Pulled up to 5V line through 3 3K ohm n Il 1 J IC47 c 1 42 8 8253C LSOO 1 MSIC I oun 17 a n 10 1 n 00 IHIIII I D GATU n D c jj n IUK D IO ATll co UT CL U IIOOP In Afj iiIi IiiII CHHRI iiW A r It Act VCCC VONO 12 L...

Page 28: ... lC 3 L I I ...

Page 29: ... o 1 26 Perspective View Parts Fitted face I J Opposite side ...

Page 30: ...HO 7 RES T GHO JZV DC 9 iilD 10 a svoc 11 HO 12 W1I 15 IIli eVDC GNO 15 I IiIIR 17 GNO tl1m GND 20 IiliI 2 ffWAiT 22 lnIESET PARTS SIO IC22 RH iX0250PAZZ SN74LS273N so 80 70 50 CLOCK CLEAR ID 20 2Q 3D 30 40 40 GNO IC 51 RH iX0302PAZZ NE556 DISCHARGE 1 T I CONTROL VOLTAGE 3 M E R 27 00 O GHO O 04 Ao A AI AS A4 A Ar Aa Ao AI All AI AM F G MZ 80A 5 5 IC27 33 RH iX03OOPAZZ SN74LS283N T M E R PUT 2 H ...

Page 31: ...A673 C 47 R2013 or 2SA49 1 Y 12V 33 1I2W A20Io_ o ZK 11I2W 02013r IS1555 A2017 1 511 2W R20S1 12 21 I C2040 2W 47 l IlOV 02006 R ig039TA r l c R2042 K 2W R2043 331112W Parts marked with I are important for maintaining the safety of the set Be sure to replace these parts with specified ones for maintaining the safety and performance of the set t oiij 0 Q rl c to n o m n G x ...

Page 32: ...A B c D E F G H 1 Display PWB 1 2 3 4 5 6 7 I fI WII 8 n 9 10 11 29 ...

Page 33: ...A B Cassette Circuit AEC P8 Cassette PWB c o E F G H CASSETTE TAPE RECORDER SEC TION 30 ...

Page 34: ... __ C __ __ D __ __ E __ __ F____ __ G __L __ H __ 1 2 3 I I j I Key Board Circuit Matrix 2 11 12 13 14 j 15 r 0 5 16 17 18 Key Board PWB 10 keyboard strobe input terminals 3 4 5 6 7 31 8 9 10 Numeric Pad 12KC079A KCCBAa 3 ...

Page 35: ...CS01 0 11 2V 1 4 1K qiJ lI 14 RS06 410IC RSOII 4 11 11 6 c3081R308 10 018 12 11 ISOV 1L 11 1 5v 5V GHD C3011 O OI V 11 I lI 9 h FllI O 1 IC _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 11 I VR301 12V 11 11 11 r o OI 11 11 C402 C 403 11 lIlIOO lI5V 3300 1311V I1 1 L _____ J 16 o I T 1 4 1K 15 J4 fa 13 112 IC401 Tl 494CN 1 2 i 14 R4011 0 0181 T 11 10 19 R408 7L 6 2 1IC 0402 0403 ER881 004 2 C40Sl O...

Page 36: ...Fl04 T315mA L I Fl03 T315mA Parts marked with are important for maintaining the safety of the set Be sure to replace these parts with specified ones for maintaining the safety and performance of the set cao7T O I I Z I C407 O IJlIIZV RIO a lIK 2 I t l 18 18 R310 lI 8K 14 13 IZ 13 112 IC401 TL494CN R404 11 I 12 R406 5 4 7K t 1 70K C40 r R40t S lIK n VR401 IK R4011 O O 4 7K sov R410 IIIK 11 6 7 0401...

Page 37: ...er Supply PWB F0396PA 11 c o I I 1 2 T B30 m I 0 TII3O 10 0 0 0 0 T 0 0 0 S WIOI rH 1 r f I J I 7f so o uo _ D 0 0 _ _ 0 E s o o 0 0 0 0 S WIO F Primary for 220V D Primary for 240V Secondary for 220V 240V G H 34 ...

Page 38: ...I w 35 t _ __ o _ _ _ _ _ ...

Page 39: ......

Page 40: ...I w 3 I 4 5 A B c o E F G H J K 195 176 f ...

Page 41: ...9 11 10 I 12 I 13 14 15 16 ...

Page 42: ... TiNSE0038PAZZ English Sometimes not packed in same case Packing Add L SPAKA0070PAZZ Sack SPAKH0031PAZZ 39 OACCK0050AFZZ for SEEG OACCB0001PAZZ for UK SESA l Sleeve SPAKS0078PAZZ Label for UK SESA TLABH0002PAZZ Packing Add R SPAKA0069PAZZ Packing Case SPAKC0189PAZZ ...

Page 43: ...t replacement item D RAM 4116 SN74LS04N SN74LSOON SN74123N SN75451N SN74LS244N SN74LS165N SN74LS02N SN7486N SN74LS245N CPUZ80 CG ROM 2K P ROM 2716 TMM 2016P 12K S RAM SN7414N SN74121N MB 14298 SN74LS157N SN74LS273N SN74LS10N SN74LS283N SN74LS74AN MB14299 SN74LSl39N SN74LS32N SN74S157N N82S100 SN74LS42N SN74LS126AN BE AE AE AK AK AS AO AE AF AR BF BH BP AM AG BD AH AO AE AK AG BD AL AF AO BK AH AH ...

Page 44: ...PAZZ CN5 CN6 CN7 OPLGN0403CEZZ OPLGZ0042PAZZ OSOCZ0029PAZZ OSOCZ0022PAZZ OSOCZOOlOPAZZ OSOCZ0011 PAZZ OSOCZ0012PAZZ OTAN LOOO5PAZZ DESCRIPTION 0_1 MFO 25V Ceramic Crystal 8 064MHz 34 Pin Socket 6 Pin Terminal for Display 6 Pin Terminal for Cassette CODE AB AM AS AD AD 4 Pin Terminal for Power AB Supply 2 Pin Terminal for Reset SW AD 18 PinTerminal for KeyBoard AG 16 Pin IC Socket AE 24 Pin IC Sock...

Page 45: ... C2010 C2011 C2012 C2014 C2015 C2016 C2017 C2018 C2019 C2020 C2036 C2046 C2021 C2022 C2023 C2030 C2024 C2025 PART NO VCEAAU2EW106M VCEAAU1CW478M VCEAAU1CW108M VCOYKU1HM333K VCEAAU1EW475M VCEAAU1AW227M VCEAAU 1CW226Y VCSACUlVE105K VCOYKU1HM332K RC EZOO29TAZZ VCEABA 1CW226M VCEAAU1CW228M RC EZ0027TAZZ VCOYKU1HM153K VCEAAU 1CW227M VCOY KU 1HM683K VCOYKU1HM223K VCOYKU1HM103K VCEAAU1CW107M VCOYKUl HM47...

Page 46: ...RM Spring AB 3015 10K ohm 1 4W AA 130 94R03080ACTRM Supply Reel Ass y AG 1 22 131 94R03180ACTRM FF Idler Arm Ass y AG 13025 j 132 94R03280ACTRM Center Gear AC 13005 VRD ST2HF470J 47 ohm 1 2W AA 133 94R03380ACTRM Spring AA 1 06 VRD ST2EF822J 8 2K ohm 1 4W AA 134 94R03480ACT RM Main Plate Ass y AG 1 07 135 94R03580ACTRM Main Plate Spring AA 3011 VRD ST2EF473J 47K ohm 1 4W AA 139 94R03980ACTRM RF Clu...

Page 47: ...bJ Key Top 8 IZJ Key Top rn III Cl Key Top A Key Top 8 j CODE AD AF AG AA AB AG AL AD AF AD AC AB AA AA AB AA AA AA AA AA AT AE AC AA AE AC AD AK AE AE AE AE AE AE AE AE AE AE AE AE AE AE AE AE AE AE AE AE AE AE AE AE AE AE REF NO 9 10 11 12 PART NO J8TN 0064PA27 JBTN 64PA28 JBTN 0064PA29 JBTN 0064PA30 JBTN 0064PA31 JBTN 0064PA32 J8TN 0064PA33 JBTN 0064PA34 JBTN 0064PA35 JBTN 0064PA36 J8TN 0064PA3...

Page 48: ...A AA AA AA AA AA AC AB AH AC AB AC AB AB AH AA AE AB AB AB VCEAAU1VM338M 3 3OOMFD 35V Aluminum C405 VCEAAU1CM228M 2 2ooMFD 16V Aluminum COIL AND TRANSFORMER RTRNZ0007PAZZ Choke Coil RTR NPoa65PAZZ PoWer Supply TrnnSfortner 6 Tl0l C t for 220V c G _ RTRNP0067PAZZ Power SUPply Transfor er for 240V MISCE LLANEOUS OFS COOO6PAZZ 6 101 OFS COQ02PAZZ 6Fl02C 14 15 16 17 18 19 OSW Coo03PAZZ OSOCAoo04PAZZ O...

Page 49: ...Q 6 OACCBOOOl PAZZ AC Cord for UK SESA AQ 6 TLABHOO02PAZZ Label for AC Cord AC 58 for UK SESAI PARTS LIST PART NO MSPRBOO38PAFG LANG K0352PAZZ JBTN D058PASA JBTN D059PASA JBTN D060PASA JBTN D061 PASA JBTN D062PASA JBTN D063PASA LANGSOO13CEZZ OSOCN0160PAZZ OSW POO05VAZZ DSOCN0168PAZZ LANG K0341 PAZZ MSPRTOOll PAZZ DESCRIPTION CODE Spri ng for Cassette Button AB Display PWB Fixing Metal Cassette But...