Yamaha TX-7 Service Manual Download Page 1 | Manualshive

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Summary of Contents for TX-7

Page 1: ...ATOR TX7 SERVICE MANUAL CONTENTS SPECIFICATIONS I HOW TO USE THE TX 7 Ml Ol DATA FORMAT 9 CONSTRUCTION OF THE TX7 32 TEST PROGRAM 2 DISASSEMBLY INSTRUCTIONS block diagram CIRCUIT BOARDS 31 PARTS LIST 34 SI CE YAMAHA ...

Page 2: ...uring disassembly and parts replacement Recheck ail work before you apply power to the unit HOW TO USE THE TX7 1 What is the TX7 The TX7 is a tone generator module that can be controlled by MIDI signals from the DX series QX1 CX5 etc It is the equivalent of the DX7 tone generating section When connected to a DX7 or DX9 it can act as a function memory for the DX7 or DX9 and thus allow you to create...

Page 3: ...gram change data will be sent from MIDI OUT The TX7 will send the DX function data for that pro gram number out of its MIDI OUT as one performance bulk data 2 However the TX7 voice and function will not change ie 0 will not occur In the setup shown in diagram 3 when you change the TX7 voice number the TX7 will load the selected voice and function data into its buffers 0 However DX function data wi...

Page 4: ...OTECT will be displayed and you will not be able to load 6 Store mode In this mode you may store data from the edit buffers into memory 1 Store TX performance Store voice and TX function data in the buffers into the voice memory and TX func tion memory you select Press TX PERF Selecting the memory number to store into STR TX PERF Memory number Select the memory number using the TX PERF switch Set ...

Page 5: ...e bulk When transmitting to the DX7 set the DX7 memory protect OFF and set system information AVAIL 8 Function mode In this mode you may edit the data in the function edit buffer Choose the parameter using the FUNCTION switch and set the valve using the 1 1 switches The FUNCTION switch will step through the functions in the order shown in table 2 and in shift mode will step in the reverse order Ex...

Page 6: ...eceived when DATA ENTRY RECEIVE SWITCH ON C 6 Data entry C 96 Increment C 97 Decrement This data will change the voice or function parameter which has been selected by a system exclusive mes sage c Data received when DATA ENTRY VOLUME ON C 6 Data entry The data entry data will be received as volume data 2 2 4 Program change Status 1 lOOnnnn Program no Oppppppp It will disregard the 2 most signific...

Page 7: ...0 0 1 1 Substatus ch 0 0 1 0 n n n n Format no Of f f f f f f f 0 1 2 9 125 When this has been received the appropriate bulk data will be dumped from MIDI OUT 3 Transmission data Normally there will be no data transmission Data will be transmitted when there is a dump request signal from outside or through operation of the panel switches The transmitted data is voice and function system exclusive ...

Page 8: ...D 0 99 10 138 LFO DELAY 0 99 11 139 LFO PITCH MODULATION DEPTH 0 99 12 140 LFO AMPLITUDE MODULATION DEPTH 0 99 13 141 LFO KEY SYNC 0 1 14 142 LFO WAVE 0 5 6 15 143 LFO PITCH MODULATION SENSITIVITY 0 7 16 144 TRANSPOSE 0 48 Concert 17 145 VOICE NAME 1 C j ASCII pitch at 24 26 154 I VOICE NAME 10 ASCII r 1 I 27 ft 55 28 156 I OPERATOR ON OFF OPERATOR SELECT xeeeeee 0 5 7 8 M BREAKPOINT BREAK POINT 0...

Page 9: ...RANGE 0 12 66 PITCH BEND STEP 0 12 67 PORTAMENTO MODE 0 1 68 PORTAMENTO GLISSANDO 0 1 69 PORTAMENTO TIME 0 99 70 MODULATION WHEEL SENSITIVITY 0 99 1 71 MODULATON WHEEL ASSIGN 0 7 72 FOOT CONTROLLER SENSITIVITY 0 99 1 73 FOOT CONTROLLER ASSIGN 0 7 74 BREATH CONTROLLER SENSITIVITY 0 99 1 75 BREATH CONTROLLER ASSIGN 0 7 76 AFTER TOUCH SENSITIVITY 0 99 1 77 AFTER TOUCH ASSIGN 0 7 1 EFFECT SENSITIVITY ...

Page 10: ...30 ASCII 4 7 64 PERFORMANCE BULK DATA f 2 Data are listed in order for the 64 performances in units of 64 bytes 64 performance The TX7 uses the first 32 performance groups Address 6 5 4 3 2 10 Parameter Data Parameter Data 1 0 p mI J VOICE A POLY MONO 0 1 1 0 12 1 PBS LO n PBR 1 VOICE A P BENO STEP 0 12 PITCH BEND RANGE 2 PTIM VOICE A PORTA TIME 0 99 PORTAMENTO GLISSANDO 3 1 M 1 GL VOICE A PORTA M...

Page 11: ...1 unit 15 CONDITION DATA 4 0 0 1 volts Bit format bit Parameter Data Notes bO PERFORMANCE ECHO BACK MODE 0 2 bl COMPUTER COMMUNICATION MOOE 1 3 b2 VOLUME CONTROL BY DATA ENTRY LEVER 0 4 b3 CONTROL CHANGE RECEIVE 1 5 b4 OMNI MODE 0 1 6 b5 MEMORY PROTECT 0 1 7 b6 DATA ENTRY RECEIVE 0 1 8 2 Data is 1 only when in COMBINED MODE and internal mode has been selected 3 Data is 1 only when in COMBINED MODE...

Page 12: ...es x 32 4 K bytes Format for each voice is the same as the voice edit buffer but 155 bytes of data is packed into 128 bytes of memory space Unused bits are moved over Function edit buffer data 17 bytes Format is the same as MIDI data format 4 2 DX perfor mance parameter change parameters 2 7 9 16 26 These 15 bytes plus the 2 bytes Key Limit Low and Key Limit High make up the total of 17 bytes 32 T...

Page 13: ...data from EGS DAt Digital audio parallel outputs DA l2 SF 0 Shift data outputs to restore expanded SF 3 output data ECi Parallel inputs for volume envelope data C l2 from the EGS KON Key ON data input for the selected channel D0 D 7 Inputs for mode algorithm number and feedback level from the MPU 0i 02 System clock inputs When 4800 H comes up IC28 data latch will latch the data on the data bus lin...

Page 14: ... 1 1 oAS lS Ci i to AS Aft fn 3 ft AS D CC1 5J to AS DO C 4 fCi tJ trAS tS rci 7 to AS 5 rci 4 1 In diagram 1 2 the base driving circuit is D2 Ci and R 2 This controls the base current of Tr through R 2 2 Tr 2 controls the base current of Tr 1 thus controlling the voltage that appears in the secondary i tu m wnmwnmmtto ttuetua tion of the 5V and feeds back the fluctuation to the control circuit th...

Page 15: ...u press the I 1 switch the upper dark section of the LCD will grow and the volume will go up Test result Whether or not th e test was OK you may proceed to TEST 2 by pressing f YES 1 I If there is an error The problem is probably in the FM tone generator DAC sample and hold VCA control or in the analog circuitry 3 TEST 2 LCD flash test All dots of the LCD will flash on and off Test result When it ...

Page 16: ...crews 4 3 Removing the LCD Ass y 1 Remove the Bottom case 2 Remove 2 screws 5 4 Removing the PN Board Ass y 1 Remove the Bottom case 2 Remove 4 screws f and 4 nylon washers 7 5 Removing the AS Board Ass y t Remove the Bottom case 2 Remove the DM Borad Ass y 3 Remove 2 screws d 6 Removing the AD Board Ass y 1 Remove the Bottom case 2 Remove screw and 2 screws 29 ...

Page 17: ...GJ 0 1 PERFORMANCE TX7 BLOCK DIAGRAM ...

Page 18: ...TX7 CIRCUIT BOARDS AD CIRCUIT BOARD L C92422 31 ...

Page 19: ... CN1 CN4 AS CIRCUIT BOARD 15 15G 5 JC 20 fa 220 mil LC924302 32 TX7 ...

Page 20: ...TX7 2 LC92380 Q ELNA F45 94V 0 LC92441 ...

Page 21: ... iG 10 62 00 M5M51 ISP 151 iG 10 67 00 74LS138 iG 06 81 00 TC40H240 iG 05 10 00 TC40H004 iG 09 64 00 TC40H008 iG 05 1 1 00 TC40H074 iG 00 17 20 TC4069UBP iG 10 55 00 HD7405P iG 1 1 62 00 PST518 iG 13 49 00 IR931 1 iG i 10 70 00 NJM072 iR 00 14 00 TC74HC14BP iK 00 04 70 j Photo Conductor TLP552 7 M 7 1 7 LB 91 81 40 XH Connector 14P X H 3 R 9 LB 01 81 10 1 Card Fit Connector 1 IP t Y74 LB 01 81 30 ...

Page 22: ... 22 F Cl G WG 0 FZ 00 68 60 i AL Electronic CAP iooo f iov r 3 C15 16 0 FZ 00 74 401 1 OO F 25V C12 14 0 FZ 00 68 40 220 25V C 1 1 1 3 0 FZ 00 68 80 100 F 200V C5 J U C 0 FZ 00 68 90 47 F 400V C5 G WG HL 31 46 80 Metal Oxide Film Resistor 68Q 1W V ft tK R5 HL 32 52 20 220D 2W X R12 J U C HL 32 81 20 120kfl 2W X R3 HL 32 81 20 120kfl 2W X R4 6 G WG HL 32 76 80 68kfl 2W X R6 J U C HL 32 8120 120kD 2...

Page 23: ...TX7 DISASSEMBLY VIEW New Parts fr 88i 18 TX7 ...

Page 24: ... 53 52 54 j n FI FZ F3 F4 FS F6 FT FS F Fit Fll FU ICZ 1 FH YMZ12 SW ECl OPS Ec z 5200 Hgrs 1 E it i r l m 2_r 40 _L 47 _nj 4 Z _ 3 3 1 37 2 36 3 35 4 34 5 33 6 32 7 31 8 3 4 22_ 70 28 77 22 12 12 SH2 7Slf Regulator k p 1 j_TC3j 2 2 H hfe 7 C i p g ta to Analog 1 Nte Converter Buffer 560 1 4P r r Compander IC26 IHx a ij 2 IC24 I wc P4C VREF 75 10K 76_ i GrND VEE j 13 V Mft IYC7 3 Vss Vdd T N T 7 i...

Page 25: ...7 25 SSI q JJ t w vj s 3p s 4 3 S AS j A f m I I 3 rrr F VCA Control Volt MAX Volume 0V MIN Volume 3 7 3 1 JSill IV 74 u 15 _ arz tcPTn oftj Japanese IAS and Canadian Models Japanese and f V S models f BL KAC 1 T n D WH U S I AC BL V Japanese LI uuuJ TIT 4 ici 4 di h 1 3 0 0 f PQr 6X _cgR Cl 7 J OrNpi cBt C7 5 T 01 4 GNP j gt 7c 3 Y P4 Ks 2 4 IC2 M Canad an node I ISA 08 CC 1 5 1 I liAiSSL C 1 2 t...

Page 26: ...GH CS W1J PROGRAM CHANGE COMBINED INDIVIDUAL SAVE VERIFY LOAP PROT cswS a CASSETTE TX PERF TAOPE OX FUHC PUHP INIT Address M p 1 s o HOC 4 _ E S OPS KAM RAM RAM RAM 0 4 fi u c 1 2 3 4 3 I ROM Ly o U_ lu n_ Ql Uu 00 oo oo u U MSk in In CO VO c CJ u o t t x t ...

Page 27: ... Lithium Battery 3V Notes AS Circuit Board IC20 YM21290 OT212900 IC21 YM21280 iT212800 IC22 23 T6400 iG079500 IC24 BA9221 iG106000 IC25 HD7417P iG043800 IC26 TC4066BP GG001270 IC27 TC4016BP iG001690 IC28 TC40H174P GG064100 IC30 32 LF356N GG107100 IC31 35 36 4558DV iG001390 IC33 34 NJM072 iG107000 IC37 NJM386 iG056600 IC38 i PC1252H2 GG062500 Tr3 2SA1015 0 Y Tr4 2SC2120 0 Y D3 1SS133 RY1 sMZ 12 Fl ...

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