SHARP SERVICE MANUAL - The Sharp MZ
Contents
1. SERVICE MANUAL CODE OOZMZ1UO6 E Expansion Box MODEL MZ 1U06 FOR MODEL MZ 700 INDEX opecification Block diagram Connector pin configuration oystem schematics Power supply Troubleshooting Circuit diagram and parts layout Actual wiring diagram Parts guide amp list 1 MZ 1UO6 specifications 1 1 General specification Connector signal see the wiring diagram for detail of the bus line con configuration nection cable and the interfaing connector signal line connections Signal level TTL compatible I O specification The specification of IC used shall be the input and out put electrical characteristics The following ICs are used SN74LS00 SN74LS04 SN74LS10 SN74LS14 SN74LS22 51174830 SN74LS42 SN74LS244 SN74LS245 Automatic reset A reset pulse of more than 3 ms is issued at power on circuit Operating O to 450 C temperature Storage 15 to 70 C temperature Supply voltage 230 VAC gt V 50 60 Hz Physical di 224 4 mm W x 264 mm D x 68 mm H dimensions 1 2 Mother board specification Data bus SN74LS245 x 1 Buffer circuit lt Address bus SN74LS244 x 2 Control bus SN74LS244 1 3 Power supply specification Input voltage 230 VAC ES V 50 60 Hz Output voltage 5 VDC 2 0 A E E 2 Block diagram ADRESS AO BUFFER A15 POWER SUPPLY PORT ADDRESS SET DAISY CHAIN EXRESET ab IEI IEO IEI IEO DIR GATE DO DATA BUS D7 CONTROL2. oo gt gt gt gt ix ix gt gt gt jejejeje ele eo lelelr eleiiltititlesiriririritiritititritit eleleimielsiejej je e CON MN IO N lu Nj mel et J NON Oy oO Oy Ir y u O HI IO IO III DED DD DI 6 6 6 6 6 6 77 6 eloininininininininininlolslololololslslololols en er CN Las tu lu lu er 00 e100 ol lim iaa ln in ers OUI olen un njoj e ex n e BERES Uod Land x m IR j EN ER EE SR S a jn S DS SS ied O NIVA ice O 0 ho NO 2 2 2 2171717 1 12 ww uw lolo l
3. S D QI GI 21 V V V O o 2 OOO 9 Oja xixixixi O lt PARTS CODE Electronics parts 15 DESCRIPTION m a a a Sls 2 Slo gt _ o amp REE _ o S 5 8 2 2 S eo Oj ja lolo gt gt a IO h I I O n un c e o S S SHEE n bd bd od 2 z 2 2 S 615 i 6 9 1 6 D Pi 9 G e 2 3 Z 510 Oo Tija gt me zz aa o bx bx so olololo ololalo olololololololololololo aw Oa uw ul Oz o m omo Ojollo x o OF elolo lt gt amp amp EZ gt gt gt N Il DESCRIPTION Cabinet Top Chassis PWB Guide angle Connector for 1 F slot Guide rail for PWB Connector for flexible cable O Cable Tie wrap PARTS CODE PARTS CODE 2 Mechanical parts to rm m NININININI NIN N oNlsl sNielolsls q XL L Ll A gt gt gt gt gt LIL ia gt gt gt iz i lt imiolaiojojxiolojojoj lt i lt jo OCA eje lefejojo le lilii WTI WLN CO PIS IR MI MIN o I lcu colol IriIr lcolunicnlolo
4. CONTROL SINGNAL SIGNAL CONNECTOR cni cal co co mika je o o S BUD 5 gt O lt o DISCS Oj lt olor lu Es os ode ojo e i es eel ele Rs C5 col co A colcalen ical cal en co a po 20 ro p oN ld xo ojo m Oiz lo gal al aj gt e gt gt a gt a ala alao CN4 AND 5 td ez elas T z z z z zu ERNE z ZE Y o lulio x x9 CO d al 21 mu O D Ql NY lt A lt POO cu am Ol Gy O SITO LST IE e 2 E ao al aam lt lt lt lt gt gt do gt gt lt lt 3 Connector pin configuration CN1 0 e lt O m tn m 4 System boloc diagram SND YNI A1ddNs ow g3MOd GN9 SLs JY x AS 00 sng L on dan Y ENE I QC dl J 13S 38 Lio dd X e I IC e a Ta a 0 0 CDi awaits a c cA u M 4 5 Power supply circuit 5 1 Power supply
5. Check if NO and RD to low at lt bus lt and WRB go low a Replace 6 the same time e cable the same time See fig 3 YES YES NO Enter the search program 4 See Fig 2 YES if IQRSB NO Check if and RDB to low at gt eplace IC6 KOB A7B and D0B b75 NO 000 0 the same time 6 uM 163 of 008 8 Check the data bus 1 0 select circuit YES Enter the search program 2 Execute RUN command m Search program 1 0000 3E 0001 00 0002 03 0003 00 C004 C3 0005 02 0006 00 TORQ IORQB WR ne WRB Fig 1 Fig 2 Search program 2 COO0 3E 0001 FF 0002 03 0003 31 CO04 C3 CO05 02 CO06 CO Search program 3 COOO 3E cool FF 0002 D3 C003 FE C004 C3 CO05 02 0006 CO Search program 4 CO00 3E CO01 00 0002 DB 0003 00 CO04 0005 0006 6 2 IC circuit check method 1 Press the IC insulator with your fingertip and check the following see if too hot IC gate defect or short in the circuit see if any condition changes improper soldering or printed wire 2 Check the following defects using the oscilloscope TTL IC logic does not match IC gate failure see if the TTL IC voltage is within the TTL level NOTE TTL high level 2 5V or more TTL low level O 5V or less ug 7 Circuit diagram ans parts layout TK 580919 gt 0 9 N lt v FUSE T 0 HAY 12430 94 vc Dl H
6. block diagram AC FILTER RECTIFIER RECTIFIER FILTER CIRCUIT CIRCUIT CIRCUIT CIRCUIT CIRCUIT CONTROL CIRCUIT 5 2 Power supply section wireing AC TRANS SUPPLY 5 3 Troubleshooting the power supply unit AC PLUG BUS BOARD o oo 5 3 1 Possible phenomena In order to know the exact point of the trouble put power on and check the output voltage that 1 it is at the given rating of SV 2 no voltage at all OV 3 it is about 1 to 4V only 4 it rises to 15V or 5 irregular increase in output ripple See the description below for each of phenomena above 5 3 2 Tracking the trouble location 1 When it is at the given rating of 5V If a voltage drop occurs with the Bus Board in connection though the normal condition is seen when a 2 5A load 2 ohms 20W ceramic resistor or electronic load device is connected to the power supply it is be cause that the circuit load is higher than 3A and more In this case check the Bus Board and the circuits connected to it 5 2 When no output voltage is seen OV 1 Open fuse Fl 2 Defective Q1 No failure Open 3 Defective 6 Replace 1 4 Defective IC 24 N 5 Defective thermal fuse T1 G NG Replace R12 C16 and C17 NG Replace REC Replace Q1 Replace R16 Replace IC 24 Replace the above components in reference with the figure to check the defective componen
7. A 3 20 2 3 3 6 8 yoo ZHOS AOCE IV 0 dr C Lo oT ic 5 1C 4 oT iC2 1C3 IC 1 IC 7 ic 6 seo v IC 16 15 c13 At CN 2 IC 22 CAI 0 CN3 A B CN 1 no 22 22 wu Ja s To oom J 0057 oesi st w zasa 2 azsa 09L MZu Lap uw KE j sis oe ow 9 0 e 850 8t 0 10 89 0 8v 9 620 806 116 Y sel e ON m r 6 6 6 29 SA BASIS 49001 9 Parts guide amp list HUE 2 2 2 2 A EE ie e OIN O 00 eo o u O 6 aja NIN 5 e Q e e A oc is O OOO OOOO E Ez 5 Xr c Land e Q 9 DESCRIPTION a o ame o a o an o me o Y O O o a 06 72 C3 C8 61316211 45 IC1 IC2 IC7 D2 Fuse for 220V FURS a lt ojojojoJojololojojolojojolololojojo m a ojojojojojojojojojo ojojojo Q ac OZ Z O lt Oo ojo o gx m gt gt lt lt N N S ISIS a a oa gt R NINININI ANNNNNINNNNN e tf mt me z ZA NINNININININININTNTIN gt gt gt ene NNN lt i i 2
8. mix NINO eo io oe oejojejololewe iolijelmemi i oiei 1 eioeieloeliei i ojolo ojojojmijojmjojojojojmiolojojojojojojola 2 1 9 90 ojojo IM RIE RD RD d d RD RR VV VO dIe c a aa e alunlun A EEE b b EE EL LE RO gt j BESE w o lite lit 4 nu un nioininioiainininiaoinininiainlniniioininlmininininininimiain x 6 9 de da u fla ft u fa jus ul L jus ft ft ft fu lu ja lu lO lo luc ioo IO T IT u ula e ta fu lu O010 010101010101010101010101010101010 m0 m m0121212210l0lm OOO ceeojjojojjojoejojojojioiloloijeioejioiolioliolixiolixixlioixixixixioiob o ojolo 16
9. olo lulu I Isli WL 6 6 1616 1616 16186 O O O O IO O O u fur pur fue QO fee ju ju fie ju ju ju u Po oo oo fe ee ae fu fu fu t les fu tu lue u lu lue O O O Rn LO ajajajaja ue OIOIOIO0ITI01010101001010 01010 lt 1TITITITITITITITITIOIONIOIOlOoIOolIolIololololo 6 6 2 1212 DDD DD gt gt lt lt gt gt lt lt 2 6 ISIS KS OS ODO gt gt gt gt gt gt r m m N e mig el co O x buj w o olo ze QO I 0 O T 9 9 9 99 8 R17 Resistor R20 R21 R23 Resistor Resistor VRIJ Transistor Diode Diode Diode Capacitor Capacitor Ci Capacitor C1 Capacitor C19 Polyester capacitor C21 Capacitor Capacitor C2 C C C 5 S o M E PIE c ola 0 8 ge 2 o 8 wm wi w t x ee TI 6 oje A PPS lt 8 5 3 nl wv Aa
10. t Check thermal fuse 1 3 When the output is 1 to 4 5V Replace component in reference with the figure to check the defective item Replace VRI R17 and R18 NG Replace IV 24 Replace IC 4 It rises to 15V Replace Q1 with the new one when this conditions is encountered because Ql is shorted in this case If it remains the same after the replacement remove the cause that makes Q1 destructed and replace the following component in the given order to check the item causing the trouble R11 and R12 if still stays the same D3 C17 and R13 if still stays the same then IC 24 9 Irregular increase seen in the output ripple Replace C17 as it might have been fatigued o 4 Tools required for the tests 1 Oscilloscope 2 Voltmeter or multimeter digital multimeter is preferable 3 A 5V 2 5A load like the electronic load device or 2 ohms resistor of more than 20W 6 6 Trouble shooting Mother Board section 6 1 Troubleshooting procedure Check if RSTB high at power on NO Check reset Check if NO Replace are high IC3 of 008 8 YES T ves Load S BASIC Enter the search program 3 Enter the search Execute RUN 02990 command Execute RUN command NO Replace IC14 of A5B A7B Check if 0 7 and 00 07 are low YES heck if TORS Execute RUN and WR ot low at Replace the command the same time NO bus line cable See Fig 1 YES
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