Akai AX80 Service Manual Download

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Summary of Contents for AX80

Page 1: ...PROGRAMMABLE POLYPHONIC SYNTHESIZER MODEL AX80 0u9 SECTION 1 SERVICE MANUAL SECTION 2 PARTS LIST SECTION 3 SCHEMATIC DIAGRAM SECTION 4 SERVICE BULLETIN ...

Page 2: ... V V_7d lllclLWl MAX AA A Yi m1 1 m iviAVyvini mil MFMO MFNOrv MIDI N Iiicipul Inctnimpnt T jicnt al Tntprfupp IVl UMLal illoll UlllClll l l lld lllldldCC MIN A Ttsli m1 1 m IVl 1 1 N 1 1 1 1 11 1 1 1 MOD MODuuation MP Memory Protection M WHEEL Modulation WHEEL OSC OSCillator PARA PAR Amptpr l rVl V 11 1C IC1 PRGM PROGram PWM Puke Width Modulation 1 U13V H 1U111 IVIV V iLllclLiv ll RL R ptnrm T in...

Page 3: ...s 3 High voltage leads 4 Use specified insulating materials for hazardous live parts Note especially 1 Insulation Tape 2 PVC tubing 3 Spacers Insulating Barriers 4 Insulation sheets for transistors 5 Plastic screws for fixing microswitch especially in turntable 5 When replacing AC primary side components transformers power cords noise blocking capacitors etc wrap ends of wires securely about the t...

Page 4: ...OCEDURE FOR AX80 VOICE PCB 1 1 1 PREPARATIONFORTHE ADJUSTMENT 11 2 OFFSET ADJUSTMENT ADJUSTMENT OF SAWTOOTH WAVE LEVEL ON OCO 2 1 1 3 ADJUSTMENT OF SAWTOOTH WAVE LEVEL 13 4 RESONANCE FREQUENCY ADJUSTMENT 14 5 LOADING A B BANK DATA AND CONFIRMATION 14 0u92 This Manual is FOR INTERNAL USE ONLY and must not be made available to unauthorized personal No part of this manual may be re produced in any fo...

Page 5: ...0 to 5 sec 23 36 40 WAVE XL A A 24 LFO select OSC 1 OSC 2 VCF 25 41 Attack OSC 2 VCF LFO EG 26 42 Decay 27 43 Sustain 28 44 Release 29 45 Key follow 30 EG select VCA VCA VCF VCF Two independent EG systems enable the following range of set tings to be achieved VCA 25 29 VCA VCF 25 29 VCF 41 45 31 Key velocity 32 Level Tune 50 cents Wheel Modulation OSC VCF Pitch bend 1200 cents in 100 cent steps MI...

Page 6: ...2 2 How to dismantle the Keyboard Block and bend Panel Block Refer to Fig 2 3 KEYBOARD BLOCK SCREW X 5 BEND PANEL BLOCK SCREW X 4 Fig 2 3 1 Remove the screws in group A 5 screws for the Key board Block and the screws in group B 4 screws for the Bend Panel Block Refer to Fig 2 3 2 Then disconnect the connectors P3 on CPU PCB for the Keyboard Block and PI P2 for the Bend Panel Block Refer to Fig 2 2...

Page 7: ...III CONTROLS AND UNIT CONNECTIONS SERVICE MANUAL AX80 6 ...

Page 8: ...en the use of a memo rized chord is required To cancel f HOLD button and indicator Press this button to extend h note of the key depressed c WRITE button and indicator Use this button to memorize the voice data created during EDIT mode onto memory banks A or B Press the EDIT button to cancel this function during TAPE button and indicator This button is used to save record the voice data memorized ...

Page 9: ...I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I II fig II III If III 11 iff II iff II ill ti I II III ll I I III II III II III II Ml II III II III r o o tio o o r n o o nc5J o o not oo no o o no o o noj oo no V V V WW V W V 5 Piano keyboard AX 80 keyboard coverage X Key board Coverage by Frequency Range Setting El or E7 16 Ci Ce 8 C2 C7 4 C3 C8 2 C4 C9 Piano A0 Ae Fig 4 1 SERVICE...

Page 10: ... optimum results 3 Three combinations ROM IC4 PD2764 D Voice IC 106 806 in VOICE in CPU PCB PCB ECM3372 Program Versions Types Lot Numbers I B 8425 I B 8427 K C N A 4 How to distinguish the differences y r 842 EM 337 2 8425 3I60B OI I CEM 3372 I CEI 8427 3I60B 0I 306 _ INDICATING TYPES 3372 3060C 0I S I AX 80 I IaX 80k INDICATING PROGRAM VERSIONS Fig 6 1 r SERVICE MANUAL AX80 9 ...

Page 11: ...5 Location of the ICs Refer to Figs 6 2 7 1 Fig 6 2 10 SERVICE MANUAL AX80 ...

Page 12: ...ance frequency for each voice Make sure to load A B bank data from the cassette tape after repair or and adjustment was completed 7 2 OFFSET ADJUSTMENT ADJUSTMENT OF SAWTOOTH WAVE LEVEL ON DCO 2 1 Turn on the unit then the unit will be initialized in the PI Preset l mode 2 Set the unit to Edit mode and set the parameters as follows Parameter Button Function Display Data 6 OSC 1 LEVEL 0 7 FREQ RANG...

Page 13: ...y numbers are indicated as the FREQ RANGE at 16 setting See Fig 4 1 PICAU Fig 7 3 Output waveform when C6 is depressed 12 Determine the average peak to peak voltage i e lOVp p from above readings 13 Connect the oscilloscope probe to IC101 Pin 1 14 Press the lowest C key CI and read peak to peak voltage then change the connection to IC201 pin 1 press the next higher key Dl and read Peak to Peak vol...

Page 14: ...C 1 LEVEL 99 13 OSC 2 LEVEL 0 24 LFO SELECT 1 20 LFO 0 4 Connect the oscilloscope probe to the Test Point C38 TP and TP IO GND 5 Press the key from C 1 to C2 one by one and adjust by turning VR102 to VR802 for required Voice No refer to the table below so that the duty cycle of the square waveform is 50 VOICE No VR No Key No 1 102 CI Lowest 2 202 Dl 3 302 El 4 402 Fl 5 502 Gl 6 602 Al 7 702 Bl 8 8...

Page 15: ...33Hz 4 G2 501 A3 or 233Hz 5 A2 601 A3 or 233Hz 6 B2 701 A3 or 233Hz 7 C3 801 A3 or 233Hz 8 Key number are indicated as the FREQ RANGE 8 setting See Fig 4 1 6 Go back to the 1st Vioce Press the lowest Key C2 to check drift of the frequency and readjust if nessessory then check next VOICE No up to the Voice No 8 as the same manner as the item 5 7 5 LOADING A B BANK DATA AND CONFIRMATION 1 Turn off t...

Page 16: ... 5 a a 5 S 3 s a g a a a 2 s s a a a a g 3 2 s g 3 a 2 3 3 f s J 3 2 a R 0 CD a a si a 3 3 f s 3 3 g a 5 s a a g a s 5 a 8 8 a a a n a 6 a g a 3 a 2 5 s a 9 s s a S a 2 a 5 a 0 3 3 3 a m 2 2 a 3 r 2 s a a g c 2 8 5 2 3 a a 2 a a a 2 a a a 3 a a 3 s 3 a g a g s 3 s s CO 5 s a a a 5 3 3 a a 3 E a a s a a CD a 8 S s s R s a 3 g s S g S S 3 3 g a a a g a a CO S a s 3 3 3 a a a 2 a a a 3 S a 3 3 a 3 a ...

Page 17: ...S 5 s g s S s 5 o 8 g g a g 5 fi o o o o c o o o o c o 0 g 8 S o 0 g s 5 o O 3 3 X 3 g 3 3 g s s 8 s g a g g a a a a a g 0 g s o S o s g a 3 5 3 g s g a Si 8 S 8 s s g 3 g 8 g 3 g g s 2 8 g n 5 s s g o o S s s g s g g s a s g a g g s 5 S s S 5 8 3 8 a 8 g E g 8 8 5 g s K S s g 8 s g 8 8 8 a 8 s s s g g g 8 S 8 a 8 a a s 8 S E a s s S s 8 S 3 5 g s g g g 8 8 i S t t 8 K s g g g 3 g s g g S g s g g ...

Page 18: ......

Page 19: ...S 5 a s 8 8 s a 2 a 8 5 8 S R S lis o 5 r s r 1 n o s s s S a o R z o a r a Li s r 2 5 g s 8 g 5 5 8 s s S S 2 L 2 8 s a S S r S 8 g s g s s s S K s s 2 o o o H s s 1 s I S s S s g s g g a 8 g a g s 2 2 2 2 E z I 1 Z Z Z z z g 5 2 S 5 E S s s 2 2 ...

Page 20: ... OPERATION 3 PC BOARD 23 9 JACK PC BOARD 23 10 POWER SUPPLY PC BOARD 24 11 FILTER PC BOARD 24 12 MUTING PC BOARD 24 13 PANEL BEND BLOCK 25 14 ASSEMBLY BLOCK 27 15 FINAL ASSEMBLY BLOCK 27 INDEX 28 This Manual is FOR INTERNAL USE ONLY and must not be made available to unauthorized personal No part of this manual may be re produced in any form without permission from AKAI ELECTRIC CO LTD Tokyo Japan ...

Page 21: ...MT ZS 536488 BID20x08STL CMT ZG 402895 CS ANGLE ADJUST SPRING SP Service Parts Classification A small x indicates the inability to show that particular part in the Photo or Illustration This number corresponds with the in dividual parts index number in that figure This number corresponds with the Figure Number PART NO BA T2034A070A EI 324536 EI 336801 EI 331661 EI 336725 ET 200985 ET 554657 ED 318...

Page 22: ...SN74LS293N 44 N EI 354153 IC SN74LS373N 45 N EI 355771 IC SN74LS38N 46 N EI 353315 IC SN74LS42N 47 EI 304657 IC TC4011BP 48 EI 306727 IC TC4013BP MC140I3B 49 EI 330391 IC TC4050BP 50 EI 302233 IC TC4051BP 51 EI 324255 IC TL082CP 52 N EI 354099 IC PA80C 53 N EI 354197 IC jiPC311C REF NO 56 N 57 N 58 N 59 N 60 N 61 N 62 N 63 N 64 N 65 N 66 N 67 N 75 N 76 N 77 78 N 79 N 80 81 82 83 84 85 86 N 87 N 88...

Page 23: ...GR 7 TR701 707 177770 TR 7SA60P K NP F F Ci 7 TR703 704 Z 1 IX UJ U4 FT 4910S1 TR FFT 7SK30A OR 7 trroi so Z 1 I OU I OUi FT 37777P C 1 DLL TR 7SA60RK NP F F G 2 TR803 804 FT 491051 TR FET 2SK30A GR 2 D1 Fr 37Q058 LU Ji7UJO D 7FNFR H H75 Tl L I I IX I 1 I 1 J V 1 n i n l tr in7 ED 30191 n sn irr N h ns44R 2 D108 109 ED 344280 D SILICON H GMA 01 FY2 F05 2 D201 to 207 ED 3019 1 D SILICON H DS448 2 D...

Page 24: ...L R325 3 CPU PC BOARD 6 D4 to 14 ED 3541I4 D LED BR 5507S RED 6 SW1 to 14 ES 354115 SW TACT SKHCAC02 1 A REF NO PART NO DESCRIPTION CPU PC BOARD 7 OPERATION PC BOARD 3 IC1 2 EI 357060 IC iPD7811G 144 REF 3 IC3 EI 354153 IC SN74LS373N PART NO DESCRIPTION 3 IC5 6 EI 354147 IC iPD446C l NO 3 IC7 EI 355578 ICMM74HC139N 3 IC8 EI 354152 IC SN74LS138N 7 SW1 to 19 ES 354115 SW TACT SKHCAC02 1 A 3 IC9 10 E...

Page 25: ...00 1 0A 10 D6 ED 357038 A D SILICON DBB10B 100 1 OA 10 R1 Er 338000 A R FUSE ERD2FC S10 1 4W 2200G 10 R3 ER 302241 R CB H S10 FS RDS I 4W 4R7J 10 C4 1 1 EC 323847 C EC V CUT SM 102M 35 0DC 10 C18 EC 347967 C EC V S10 KM 682M 16DC 10 1 EZ 200473 SILICON RUBBER SHEET TC 30 10 2 ZW 632226 INSULATOR WASHER BUSH M 11 FILTER PC BOARD DESCRIPTION REF NO 11 FL1 11 C1 PART NO EO 354224 EC 338411 COILLF PLA...

Page 26: ...PANEL BEND BLOCK PARTS LIST AX80 25 ...

Page 27: ...ASSEMBLY BLOCK ...

Page 28: ...ES 354236 A SW SEESAW SDDJA 1 1 53 A 01 1 J U E B S ES 355573 A SW SEESAW SDDAB1097A T 8 5 C A ES 349070 A SW SELECTOR YKS 1 1 0002 02 4 U E B S REF NO 14 SW903 14 F1A I4 F1B 14 F1C F2 14 F3A 14 F3B 14 F3C 14 F4A 14 F4B I4 F4C 14 F5A 14 F5B 14 F5C 14 F6A 14 F6B 14 F6C RTS NO DESCRIPTION ES 357045 SW SLIDE SSSB02685A 2 02 02N EF 326639 A FUSE TSC A 250V 3 1 5A J EF 306956 A FUSE TSC 1 25V 2 50A C A...

Page 29: ...304 EI 354283 2 IC28 EC 357035 2 C205 ED 344280 2 D208 EI 304657 2 IC504 EI 355560 3 IC30 EC 357035 2 C805 ED 344280 2 D209 EI 304657 2 IC303 EI 355575 3 IC16 EC 358450 14 C3 ED 344280 2 D608 EI 304657 2 IC104 EI 355578 3 IC7 EC 358450 14 C2 ED 344280 2 D809 EI 304657 2 IC503 EI 355665 10 IC1 ED 301911 2 D301 ED 344280 2 D808 EI 306727 2 IC305 EI 355666 10 IC3 ED 301911 2 D605 ED 344280 2 D508 EI ...

Page 30: ...2778 2 TR501 ET 332778 2 TR102 ET 332778 2 TR602 ET 332778 2 TR1 fc 1 332778 2 1 R401 ET 332778 2 TR201 ET 332778 2 TR701 ET 332778 2 TR801 ET 332778 2 TR402 ET 332778 2 TR101 ET 332778 2 TR301 ET 332778 2 TR202 ET 332778 2 TR802 ET 332778 2 TR302 b 1 551 1 la 2 TR502 ET 332778 6 TR7 ET 332778 6 TR4 ET 332778 6 TR5 ET 332778 6 TR6 ET 332778 6 TR3 ET 332778 6 TR1 ET 332778 6 TR2 ET 347026 10 TR1 ET...

Page 31: ...MEMO SERVICE MANUAL AX80 30 ...

Page 32: ...MEMO SERVICE MANUAL AX80 31 ...

Page 33: ...MEMO 32 SERVICE MANUAL AX80 ...

Page 34: ... 2 SCHEMATIC DIAGRAM 8 8 FLD 1 2 PC BOARD 9 9 OPERATION 1 SCHEMATIC DIAGRAM 10 10 OPERATION 1 PC BOARD 11 11 CPU SCHEMATIC DIAGRAM 12 12 CPU PC BOARD 13 13 VOICE SCHEMATIC DIAGRAM 14 14 VOICE PC BOARD 15 0u92 This Manual is FOR INTERNAL USE ONLY and must not be made available to unauthorized personal No part of this manual may be re produced in any form without permission from AKAI ELECTRIC CO LTD...

Page 35: ...B G H K MEMORY PROTECT SW OFF ON VOICE PCB PI SAMPLE HOLD 6 JACK PCB P2 ADDRESS CONTROL LINE AX80 CPU BLOCK DIAGRAM No 2 1 85032IA O 6 8 8 J c EL B D H K 2 ...

Page 36: ... GAIN ADJ IC9 to 12 S H TP WAVE FORMING ICI05 I 2 TC40I3BP SUB OSC f5 6 1 s CTL SUB 777 PIN I or 7 T5 P N 3 or 5 IC8 to 26 TL082CP ICI7 1 2 ICI8 2 2 I IC 3 I IC 2 I INDIVIDUAL FOR EACH VOICE ANALOG SWITCHES IC2to6 TC405IBP RESONANCE OSC ADJ I5V WM 15V ICI06 CEM3372 VCF OTHER SEVEN VOICES VCA ICI07 NJM4558D l4te 2 BUFFERllJ IC27 TL082CP IC28 BA6II0 TRI ICI8 1 2 HPF ICI7 2 2 IIC8 l 2 7 IC23 to 26 l ...

Page 37: ...TE VOICE 8 DCO 1 VOICE 8 GATE 12 VOICE 8 DCO 2 HARD ON OFF SOFT ON OFF DCO IN ON OFF DCO 1U ON OFF DCO 2N ON OFF DCO 2IU ON OFF SUB OSC ON OFF PHONES PEDAL TAPE MEMORY TAPE MEMO IN TAPE MEMO OUT JACK PCB L1003A512C I 33 MUTING PCB LI003D5I50 7 3 3 I Y_ y 0 0 2 aw WI7 jj p LT 1 1 Ks H S l 0 C c 0 OPERATION 2 PCB L1003A512B OPERATION 3 PCB L1003A513C NOTE UNLESS OTHERWISE SPECIFIED ALL RESISTORS IN ...

Page 38: ...NUED SAFETY REPLACE SAFETY CRITICAL COMPONENTS ONLY WITH MANUFACTURER S RECOMMENDED PARTS AVERTISSEMENT AIL INDIQUE LES COMPOSANTS CRITIQUES DE SECURITE POUR MAINTENIR LE DEGRE DE SECURITE DE L APPAREIL NE REMPLACER QUE DES PIECES RECOMMANDEES PAR LE FABRICANT SW5 _ 3 SW 3 K 0 g 4_ OPERATION 3 PCB LI003A5I3C JACK PCB LI003A5I2C 5 ...

Page 39: ...E LES COMPOSANTS CRITIQUES DE SECURITE POUR MAINTENIR LE DEGRE DE SECURITE DE L APPAREIL NE REMPLACER QUE DES PIECES RECOMMANDEES PAR LE FABRICANT POWER SUPPLY PCB LI003C5090 VOLTAGE MEASURMENT CONDITION WAS IN THE PI PROGRAM WITH NO KEY FUNCTIONS 15V 5V 2 6N0 3 5V 4 15V 5 15V 1 6ND 2 I5V 3 5V 1 GND 2 TO VOICE PCB P4 TO MUTEING PCB TO CPU PCB PI5 TO OPERATION I PCB PI TO CPU PCB PI6 AX80 POWER SUP...

Page 40: ...INUED SAFETY REPLACE SAFETY CRITICAL COMPONENTS ONLY WITH MANUFACTURER S D RECOMMENDED PARTS J AVERTISSEMENT AlL INDIQUE LES COMPOSANTS CRITIQUES DE SECURITE P PNP TRANSISTER POUR MAINTENIR LE DEGRE DE SECURITE DE L APPAREIL NE REMPLACER QUE DES PIECES RECOMMANDEES PAR LE FABRICANT 7 ...

Page 41: ...function No function change after the power SW was ON with voltage indications were for DC voltages with pulses voltages may vary by the wave forms Voltage indications related with parameter displays No 26 28 and 32 of the FLD IN 2 in FLD 2 PCB may vary with a K version ROM 38 4V G 7 G6 G 5 G 4 G 3 G 2 6 8 kJU IC I HD74LSI54 Rl 10k Wv s r 8H kl i ng k s rOH KS k z M 5 m k wDj 1 dh ksf DM r r i KiH...

Page 42: ...H074LS154 Q 12 i 10 9 8 7 6 5 4 3 2 1 s c o o T O m 73 z_ 00 o FLD 2 PCB LI003A5I3A 1 I i _ si 8 1 j o IC6 yPASOC TO CPU PCB P9 30 0 3 27 6 5 24 3 22 19 7 4 2 o O 9 9 6 O O C g O O O 20 23 29 7 ES 25 24 3 22 19 17 14 i2 I I SO 9 6 6 5 3 O O j ii 2 3456 7 3 St 5 jjj pPASOC 16 15 14 13 12 SI 0 o TO CPU PCB P8 l B 2 3S 5 6 7 8 9 10 l 12 13 j I 2 3 4 6 7 I J 1C3 JJ o I c 1 1 1 iC2 uPASOC I fj 15 14 13...

Page 43: ...ges with C type IC s will be almost the same Voltages at the ROM IC4 in the cpu pcb were with an I version voltages with a K varsion ROM will be almost the same The unit was in the PI program mode with no key function No function change after the power SW was ON D with voltage indications were for DC voltages with pulses voltage may vary by the wave forms Voltage indication related with FLD D3 may...

Page 44: ...I 2SC536NP E C 8 2SC536NP THIS UNIT EMPLOYS A LITHIOM BATTEM FIL MEMORY BACK UP DO NOT OVER HEAT IT WITH A SOLDERING IROS TO AVOID EMPLOSION _VR90I j _VR903 j _V_R906 Jl_VR907j _VR905j j VR904_ _ _ J TUNE ICONTROLl 1 MODULATION lPITCH_BANPl ...

Page 45: ...2SA608K 2SK30A AX 80 VOICE SCHEMATIC DIAGRAM no 6 6 8503 14A ...

Page 46: ...OPERATION I PCB LI003A5I3B PNP TRANSISTER TRI to 7 2SA608K NP E C B 2SA608K ND ...

Page 47: ......

Page 48: ... f Iff g w R321 R33 R33S f R336 Rue V L R i32 V 1 R 33 3 R 36 R7 n V R6 VV R8 C6I6 R6J8 W JS RSi7 too csu wis C5 6 R538 WV R537 a C4U C3i8 Hh R3t C4 6 Ri33 V i Ri 37 R3 7 R3 I VR70 R328 C707 o R6 C62 ef 39 H hf tJSI A h C6 LZ__T y _5j Q o V A R623 ICS07 T T 749 D709 R 28 0609 00 c 22 C622 3 S I h R24i P6 R338 5 R337 V CT1 R247 R5i3 C520 w vo RS H 5 l Ct 20 W H h P 243 H h C220 A j WL r S vV r v A ...

Page 49: ... FEET ON 32 FEET ON 4 FEET ON 8 FEET ON 16 FEET ON 32 FEET ON MIDI OUTPUT MIDI INPUT TAPE INPUT DATA ACKNOWLEDGE NEXT INPUT SUSTAIN INPUT TAPE OUTPUT INTERRUPT INPUT FROM JJPD8279 POWER ON RESET DATA ADDRESS MEMORY ADDRESS GND ANALOG OSCILLATORf I2MHz L_ DIGITAL GND l PAo VCC 4 5V DIGITAL PAi V00 5V FOR RAM 3 PA2 P07 K2 w DO AO 0PA3 PD6 fej a DI AI 5 PA4 POg D2 A2 6 PA5 P04 K D3 A3 7 PAg PD3 D4 A4...

Page 50: ...ee also AX80 Service Manual for servicing and adjustment O Further technical information will be issued as any arises Keep such information carefully under the name of this file 0u92 This Manual is FOR INTERNAL USE ONLY and must not be made available to unauthorized personal No part of this manual may be re produced in any form without permission from AKAI ELECTRIC CO LTD Tokyo Japan ...

Page 51: ...MODEL AX80 INDEX Bulletin No Subject No Description AX80 1 001 Change of Voice Control IC 002 IC TC4013BP name change ...

Page 52: ...EI 354184 UPD2764D I EI 354145 New CEM3372C EI 359630 UPD2764D K EI 359631 When one of Voice Control IC is changed from Old type to New type and vise versa it is necessary to replace all Voice Control ICs and ROM IC at the same time Changed from January 1985 Interchangeability Not interchangeable The following shows how to identify old and new ICs 8 TYPE INOCATING LOT NUM8ERS INDICATING TYPES C TY...

Page 53: ...not affect the operation of AX80 even when a new TC4013BP is installed The new type IC can be identified by its Lot Number added to its Lot Number The letter B will be Old type TC4013BP New type TC4013BP 8501H 8522HB The chart below shows the difference of their function OLD TRUTH TABLE TC4013BP INPUTS OUTPUTS CL PR D CPA Qn 1 Qn 1 L H 3 m H L H L m L H H H it H L L L _r L H L L H _r H L L L i_ Qn...

Page 54: ... IC IC TC4013BP name change For easier Voice P c B adjustment Pitch bend modulation VR change For easier Cut off frequency adjustment Sub OSC oscillation countermeasure Osc X tal costdown IC change information Parameter change in Edit mode countermeasure Phone Amp Oscillation countermeasure Change of Voice Control IC and operation ROM IC o ...

Page 55: ...U Changed from F btumly 1985 Service Ref No SX 5066 K 706 85 No AX80 3 DATE August 1985 MODEL AX80 010 Subject Trouble countermeasure Oscillation in Phone Amp in Jack P C Board Symptom oacitor has been added in Phone Amp Countermeasure A capacitor Description Ref No C CE 220J 50DC 9 C7Z 8Z Changed from June 1985 Service Ref No CNA0552 ...

Page 56: ...C UPD2764D in CPU P C Board has also been changed from K version to L version Ref No Part No Description PREV 2 IC106B 806B EI 359630 IC CEM3372C NEW 2 IC106Z 806Z EI 363530 IC JCEM3372D PREV 3 IC4B EI 359631 IC UPD2764D K TYPE NEW 3 IC4Z EI 363531 IC UPD2764D L TYPE NOTE IC CEM3372D has to be paired with IC UPD2764D L TYPE for prop operaion A B Bank Sound Data are interchangeable Changed from Jul...

Page 57: ...ontrol IC 002 IC TC4013BP name change 003 For easier Voice P C B adjustment 004 Pitch bend f modulation VR change 005 For easier Cut off frequency adjustment 006 Sub OSC oscillation countermeasure 007 Osc X tal costdown 008 IC change information 009 Parameter change in Edit mode countermeasure ...

Page 58: ...3372B EI 354184 UPD2764D I EI 354145 New CEM3372C EI 359630 UPD2764D K EI 359631 When one of Voice Control IC is changed from Old type to New type and vise versa it is necessary to replace all Voice Control ICs and ROM IC at the same time 4 Changed from January 1985 Interchangeability Not interchangeable The following shows how to identify old and new ICs S TYPE cm 3372 8425 31608 0 CEM 3372 8427 ...

Page 59: ...Number Old type TC4013BP New type TC4013BP 8501H 8522HB The chart below shows the difference of their function TRUTH TABLE TC4013BP NEW TRUTH TABLE TC4013BP INPUTS OUTPUTS CL PR D CPA Qn 1 Qn 1 L H I5 5 H L H L S L H H H ft hsr H L L L J L H L L H _r H L L L Qn Qn Don t Care A Level Change No Change INPUTS OUTPUTS CL PR D CPA Qn 1 Qn 1 L H 8 H L H L L H H H H L L L L H L H S H L L L r L Qn Qn Don ...

Page 60: ...005 Subject To improve performance No AX 80 2 DATE May 1985 For the ease of Cut off Frequency adjustment R139 839 on Voice P C Board have been changed from 750K to 680K Ref No 2 R139 839 Previous 75 OK New 680K Changed from Dec 1984 Service ref no BB 5945X MODEL AX 80 006 Subject Trouble countermeasure No AX 80 2 DATE May 1985 To prevent the oscillation of Sub OSC C110 810 on Voice P C Board have ...

Page 61: ...ormation No AX 80 2 DATE May 1985 IC NJM4558D used on Voice P C Board has been changed to IC TL4558P for the standardization of parts Ref No Part No Description 2 IC7 2 IC101 2 IC102 801 802 Prev EI 213390 IC NJM4558D 2 IC107 2 IC307 2 IC507 2 IC707 New EI 338502 IC TL4558P IC Socket for IC TL4558P has been added for IC 101 801 Ref No Part No Description 2 S13 20 EJ 359147 Socket IC DILB 8P 8J Cha...

Page 62: ... problem of changing parameter in Edit mode by itself especially on unit with IC UPD7811G 144 as IC2 on CPU P C Board R4 on CPU P C Board has been changed from 150 to 82 FS Ref No Prev New Description 3 R4 150 82 FS 1 4W ER 322421 Changed from Februaly 1985 Service Ref No SX 5066 K 706 85 ...

Page 63: ...AKAI ELECTRIC CO LTD 12 14 2 Chome Higashi Kojiya Ohta Ku Tokyo Japan TEL Tokyo 742 51 1 1 CABLE HIFIAKAI TOKYO TELEX J26261 Printed No 850422 G1 1000 Printed Date JUNE 18 1985 Printed in Japan ...

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