Yamaha Vintage DX7 Special Edition ROM Manual

THE VINTAGE DX7
SPECIAL EDITION
*ROM^
INSTRUCTION GUIDE
WARNING! Lethal voltage can be present and will be exposed when
the DX7 case .1* opened and the unit is plugged in. All
service operations* including the installation of LCD's
ROM's etc.# should be referred to qualified technicians.

TABLE OF CONTENTS
INTRODUCTION .*..„.r,PAGES 1-2
STANDARD ROM 1. SPECIAL EDITION ROM COMPARISON-PAGES 2-3
HON TO INSTALL THE SPECIAL EDITION RDM.PAGES 3-7
OPERATIONAL PROCEDURES ..... ..PABES 7-25
... BASIC OPERATION ....PAGES 7-B
MEMORY SWITCH 41 FUNCTION PARAMETER
MASTER TUNE. PAGE 9
MEMORY SWITCH 46 FUNCTION PARAMETER
MIDI CONTROL ... . .PAGE 9
FUNCTION #1, MIDI CHANNEL INFORMATION ON/OFF PAGES 10 -13
FUNCTION 42, MIDI SYSTEM INFORMATION ON/OFF. .... PAGES 13 -14
FUNCTION 43, FC VOLUME INFORMATION ON/OFF ..PAGES 14 -17
FUNCTION #4, AFTERTDUCH INFORMATION ON/OFF PAGES. 17 -19
MEflORY_GWJTCH 410 FUNCTION PARAMETER
FUNCTION #1, VOICE INITIALIZE........ ......PAGE 20
FUNCTION 42, SINGLE FUNCTION INITIALIZE.... PAGES 20 -22
FUNCTION 43,. ALL FUNCTION INITIALIZE. ........... PAGES 22 -23
MEMORY SWITCH 412 FUNCTION PARAMETER
MIDI RECEIVE FUNCTION.. PAGES 23 -24
MEMORY SWITCH 413 FUNCTION PARAMETER
MIDI.. TRANSMIT FUNCTION PAGES .24 -25
FINAL NOTES-....... PAGE 25
FUNCTION JOB TABLE PAGES 26 -2B
APPENDIX A2ROM MODIFICAT ION INFORMAT ION. ......... PAGES 29-31
APPENDIX BTROUBLESHOOTING SECTION..PAGES 32 -35
APPENDIX BTROUBLESHOOTING CHART PAGES 36-40
APPENDIX CINITIALIZED FUNCTION PARAMETER CHART. ...PAGE 4
1
VERSION 1,3 -FEBRUARY 14. 1969

DX7 SPECIAL EDITION -^P^5IEUCXLEM-mil!E
SPECIAL EDITION ...RDM .^_INTJOBUEUPM
Thank you for purchasing the SPECIAL EDITION SYSTEM ROM lor
the Vintage (original 1DX7 synthesiser. Thla INSTRUCTION GUIDE
will provide you with the n««i»«ry information to both install
and operate the SPECIAL EDITION ROM veralon. It 1« advlaable
that you read through this INSTRUCTION GUIDE thoroughly before
installing and operating th« unit.
It might prova halpful to d.scriba th» baalc daf ini ti on and
function of eROM device or IC OnteCjreted C1 ^cu‘t> 'Jt'* ,
ROM stands for BEAD QNLY BEMORY. AROM le a device with -ultipl
pins, end in the case of the SPECIAL ED1T1DN ROM, it has atotal
of 2B pi ns <14 pins par »ida> as ahown in FI6URE 1.
FIGURE i
basically aROM has stor.d in ita»*ria* of instruct ion. and
constant vilutft that ara usad by tha computar unit of tha
instrument. The computer unit of the instrument (in this case
the DX7> retrieve* instructions from the ROM and performs tn»
necessary tasks in order to operate or implement .a particular
function. Therefore, by removing the DX7's old ROM and
it with the SPECIAL EDITION ROM (that has different 1natructi ons
stored in lt>, you can then access new and enhanced functions.
The SPECIAL EDITION RDM was developed to enhance the
Performance and MIDI capabilities of the Vintage DX7. The
enhanced features of this SPECIAL EDITION ROM include the
fol lowing I
(1) FUNCTION PARAMETERS FDR EACH VOICE CAN BE MEMORIZED OR SAVED
TO INTERNAL HEMORV OR A RAH CARTRIDGE!
C2> THE SPECIAL EDITION ROM DISPLAYS THE CURRENT MASTER TUNE
SETTING OF THE DX7!
(3> HIDI CHANNEL .INFORMATION ON/OFF FEATURE WHICH ALLOWS YOU TO
ENABLE OR DISABLE PROGRAM AND CONTROL CHANGES!
<4 )MIDI SYSTEM INFORMATION ON/OFF FEATURE THAT ALLOWS YOU TO
TRANSMIT SYSTEM EXCLUSIVE DATA OF ASINGLE VOICE OR ALL 32
VOICES. CONTAINED IN INTERNAL MEMORY!
(5) INITIALIZATION FEATURE TO INITIALIZE FUNCTION PARAMETERS CF A
SINGLE VOICE OR ALL 32 VOICES!
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DX7 SPECIAL .EQUIPS RP* P^PE
tfc) MIDI RECEIVE FEATURE THAT ALLOWS YOU TCBET THE MIDI RECEIVE
CHANNEL TO THE ’OMNI ON" MODE OR ANY ONE OF I* MIDI CHANNELS
<7> MIDI TRANSMIT FEATURE WHICH ALLOWS YOU TO ®ET THE MIDI
TRAN5MIT CHANNEL TO ANY ONE OF THE 16 MIDI CHANNELS.
<B) AFTERTOUCH ON/OFF FEATURE THAT ALLOWS YDU ™1™ETHER
YOU WANT TO TRANSMIT, OR NOT TRANSMIT,
INFORMATION. THIS AFTERTOUCH ON/OFF PARAMETER CAN BE
MEMORIZED OR SAVED FDR EACH VOICE* ..AND...
(9) MAIN VOLUME TRANSMIT FEATURE WHICH ALJ-OWS VOO ^0 TRANSMIT
MIDI VOLUME INFORMATION BY UTILIZING THE MODUlMIONFOOT
CONTROLLER INPUT. THIS PARAMETER CAN ALSO BE MEMORIZED DR
SAVED FOR EACH VOICE!
1M COMPARISON
The <cllowino ction will, rwviww th- *und«m.nt«l di *f-r-ne**
to-tnepn th. St«r>ct»rd ROM »nd the SPECIAL EDITION ROM. A*
previously —ntloh.d, th* SPECIAL EDITION ROM c.n
specific FUNCTION PARAMETERS for each voice, where the Standard
ROM did not- More specifically, the SPECIAL EDITION
memorii* FUNCTION PARAMETERS represented by .witches 2through 7
and iwi tches 17 through 32 of the DX7 efront control panel.
Also, two FUNCTION PARAMETERS of switch Bc*n be memorised-
Therefore, the mein differences between the ROM versions exists
in the FUNCTION. MODE of the DX7- Only the FUNCTIONS that *re
different will be described. All Other FUNCTIONSiof thi sSPECIAL
EDITION ROM sre the same es the Standard ROM. FUNCTION switches
1BIB, 12, and 13 of the 6PEC1AL EDITION ROM version operate
different! ythan the Standard ROM and their operational
characteristics will be described in acre detail later. The
basic differences in these FUNCTIONS are as follows.
nfhjrv pgiTtfrl >1 FUNCTION PARAMETER -MA?TER TUNE
With the Standard ROM, only the message -MASTER TU^ADJ "**
displayed on the LCD display and when moving the DATA ENTRY
•lider the pitch will vary, but it Mill not be displayed-
The SPECIAL EDITION RDM displays the MASTER TUNE message plus
the current value of the MASTER TUNE setting. When the DATA
ENTRY slider is moved the pitch will vary and it Mill also be
displayed, for es ample, Master Tune -0.
HEPKKY pmTCK #8 FUNCTION PARftfiETE&^JaiRl..CfiHTBQU
With the Standard RDM, the FCNCTIONS of snitch «8 ar.j Cl)
the MIDI RECEIVE CHANNEL .FUNCTION, <2> the SYSTEM
AVAILABLE/UNAVAILABLE FUNCTION, and <31, when the 6YBTEM
AVAILABLE FUNCTION is selected, the MIDI TRANSMIT FUNCTION.
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PX7 special EDITION ron.JMSTBUCT.1.BH..f.UlBE
Th. SPECIAL EDITION ROM h.« »M» addition*! function.
•••oci.t.d «ith th. *8 FUNCTION SWITCH. With th. SPECIAL EDITION
ROM, the FUNCTIONS of this switch are a* fellowaj <1> the MIDI
CHANNEL INFDRNATION ON/OFF FUNCTION which >Upm --
whether or not you want to RECEIVE and TRANSMIT, PROG*£"
CONTROL CHANGES., I2> th* MIDI SYSTEM 1KF ORMAT ^
which im th* sain* as th* SYSTEM AVAILABLE /UNAVAILABLE FUNCTION
and th* MIDI TRANSMIT FUNCTION. ,C3> the FC (Foot COfttrolI»r>
VOLUME ON/OFF FUNCTION that allow* you to utim* tha Foot
Control Ear modal at ion input to transmit MIDI VOLUME INFORMATION
<thi sfunction is programmable for aach voica>., and <4) th«
AFTERTDUCH ON/OFF FUNCTION which allow* you to transmit
AFTERTDUCH INFORMATION Cthis function is also programmable .for
aach voict).
With th* Standard ROM, this FUNCTION PARAMETER is u«*d for
th* VOICE INITIALIZE FUNCTION which sats or Initialise VOICE
PARAMETERS to specific conditions in ordar to provide astarting
point for voice programming purpose*.
The SPECIAL EDITION ROM has three FUNCTIONS associated with
th* «10 switch and they ar.j <1) th. VOICE INITIALIZE FUNCTION
that perform* the *am* function as th* Standard ROM VOICE
INITIALIZE FUNCTION., <2> th* SINGLE FUNCTION INITIALIZE OOB
which sets the programmable FUNCTION PARAMETERS of a SINGLE VOICE
to specific conditions, thu* providing aatarting point
EDITING purposes. ,and (3) the ALL FUNCTION INITIALIZE
that sets the programmable FUNCTION PARAMETERS o* all
to th* same *p*cific conditions.
for
FUNCTION
32 VOICES
MEMORY SWITCH *12 FUNCTION PARAMETER -
The Standard ROM ha* no function assigned to SWITCH «X2.
However, with th. SPECIAL EDITION ROM, SWITCH #12 IS assigned to
the MIDI RECEIVE FUNCTION. Thi* function allow* you to set the
MIDI RECEIVE CHANNEL of the DX7 to the OMNI ON MODE or any one o<
the 16 different MIDI channels, 1through 16. R*m*mb*r th*
OMNI ON MODE will .allow the DX7 to receive all incoming MIDI
information, regardless of the MIDI channel number.
ME MORY SWITCH.
The Standard ROM also has no function assigned to SWITCH
*13. Th* SPECIAL EDITION ROM utilize* SWITCH 613 to set the MIDI
TRANSMIT CHANNEL to any one of the 16 different MIDI channels, 1
through 16.
HDW TO INSTALL THX--6£E^AkJEBlXl.P!i-B.Q^l
Before attempting to install the SPECIAL EDITION ROM, pl*a*«
read the fol lowing .Instal latlon Instructions thoroughly and th*n
proceed with the installation. Installation of tha SPECIAL

n»7 special EDITIONROM TNSTRIQMJN BUIP£
EDITION ROM require. aparticular l.v.l of
gii
or make acopy of the Voices befors installing ths ROM.
Also, if you find that your DX7 ham 2SYSTEM RDM 1C»
lidentifled by XC damlgnationm ICI4 l1CIS "
board >than your unit naadm furthar •edification bsf ore
jntttl ling the SPECIAL EDITION ROM. This •odi fication will allow
leZ Vo u« asingle RDM IC in.ta.d of 2RDM 1C. -nd it^i. only
necessary for a faw vary marly production R^alm. In *l«omt all
camae this modification will not ba nacammary. Sarial numb ar aof
^pUcl^ DX7 unit. ar. giv.n in APPENDIX A, how.var.omasum t.
m.v hava alraady baan modified. When you gain accamm tD the
Tntarn^ circuitry of the DX7, you will ba able to v.r *«*•*•*£'
Dr not you need to hava thta modification dona. If your wit hi*
only ona ROM 1C, which is insertad into tha IC14 sockat, and IC15
is NOT present than tha modification ia NOT necessary Clnot
words, NO IC1S -NO MODIFICATION). If there are two ROM ICs, on.
in tha 1C 14sockat and ona in the IC15 sockat ln th_
modification Is required. If you do not have experience In th.
area of soldering and handling electronic components then this
modification and the SPECIAL EDITION ROM installation shou dbe
performed by aQualified Service Technician. Once again, if your
unit requires this modification REFER TO APPENDIX A, Pag. 29.
In order to prepare th- DX7 for the SPECIAL EDITION ROM
installation, the only tools you will head are,
(DA PHILLIPS TYPE SCREW DRIVER ..and...
(2) ASMALL FLAT-BLADE SCREW DRIVER.
If your DX7 naads furthar modification as previously
mentioned, you will read additional tool, and thay ar.,
11) ASOLDERING IRON
12) ASOLDER VACUUM OR SOLDER WICK
C3) SOLDER •.and. a
.
C4> NEEDLE-NOBE PLIERS.
Aft-r obtaining th. proper tool, and p.rf orming.nyoth.r
modification preparations, you can than proceed with the SPECIAL
EDITION RDM installation by following the STEPS given belowi
11 )In order to avoid th. possibility of electrical shock
and any accidental damage to the unit, make sure that
“4-

the power switch is TURNED OFF and the power cord i.
unplugged. Also di sconnect .any MIDI, OUTPUT or FOOT
CONTROLLER cables connected to the unit.
12) Remove the 5Phi II ips-Hsad ecrews that Mcur* the DX7*
•front control panel as shown in FIGURE 2. It should
also be noted that the screw designated with the letter
"B* (located next to the power switch) is shorter than
the other screws. Please make sure that this screw Is
used at the same location when securing the front panel,
after installation of the SPECIAL EDITION ROM is
complete!
vzsimiux*- ..ouemix.
A(4) PHILLIPS HEAD/TAPPING TYPE (SIZE 4X16mm>
B< 1 )PHILLIPS HEAD/TAPPING TYPE (SIZE 4XBmm>
FIGURE 2
<3 )Carefully lift-up the edge of the DX7*s front control
panel vclosest to the keyboard and open it all the way
until it is resting against the back edge of the DX7
case as shown in Figure 3on the next page.
(4) Locate IC14, the ROM IC. 1C14 Is located the near the
center of the Main Circuit board (the DM board) ,also
shown in FIGURE 3. At this point you can verify whether
or not your unit requires further modification before
installing the SPECIAL EDITION RDM. Remember, NO IC15,
then NO modification is necessary. If IC13 Is present
then your DX7 needs modification before proceeding and
you should refer to APPENDIX Aon Page 29. After
completion of the modification proceed with Btep 3. If
ND modification is required then go to Step 5.
-3-

FIGURE 3
<5> before removing IC14 from it socket, note the location
or direction of the notch of XC14. A« you ere feeing
the unit, the notch of IC14 should be positioned so thet
it points to the right hend side of the DX7. Now
carefully piece the blade of asmall flat-blade
screwdriver .between the IC14 and Its socket. Gently pry
up IC 14,first on one side (SIDE A) and then on the
other (SIDE E)as shown in FIGURE 4, Repeat the process
until IC14 is freed from the socket and put it aside.
FIGURE 4
-6-

PX2_SEECJ.<»L.^P-LIIiftJBgl-J^--
T-P-i-tv-T»
P
NBUIPE
U>) Non the SPECIAL EDITION ROM can be 1nM^*d*
IC14 socket. Before inserting the SPECIAL EDITION ROM
take note, of the direction of the notch- The notch of
the SPECIAL EDITION RDM should also face or point in the
direction of the right eide of the DX7. fJT*k*."“Tf.
the pine of the SPECIAL EDITION ROM are all aligned njth
holes of the JCI4 socket. If some pins are not ir» the
proper position for inserting, then before inserting tne
SPECIAL EDITION ROM, e.r.fully b.nd th. pin. to th.lr
proper poaition. Once the notch end pm. o4 the SPECIAL
EDITION ROM ere properly pomittoned then c.relully
in.ert the ROM IC. In.pect yoor work thoroughly to eake
.ure th.t no pins have been bent under or daeaged during
insertion.
<7> Make a quick operational test of the DX7 by closing the
front control panel and plugging the power. cord of the
DX7 into an .AC outlet. Turn on the DX7, the LCD display
should initially read*
WELCOME TD DX7
SPECIAL EDITION
.. and-.. then the LCD display should indicate the
previous mode or condition that was lest set-up on the
front control panel. Make .sure that you can select
various voi ces..and. pi ay the keyboard to verify that the
DX7 produces asound when an amplif ier or pair of
headphones is connected to the. unit- If the LCD display
does not indicate the above conditions, or the DX7 does
not produce asound, then turn OFF the power of the DX7
and refer to the TROUBLESHOOTING SECTION found in
APPENDIX Bon Page 32.
cB) Once you have verified the basic operation of the DX7
then turn off the power and reinstall the 5front
control panel retaining screws. Remember the shorter
•crew is to be reinstalled next to the power awitch.
Now you »r* ready too explore the advantages of the SPECIAL
EDITION ROM •
!
In this section the Operational Procedures of the SPECIAL
EDITION RDM will be described in detail. It say be helpful to
follow along with the DX7 turned DN, so that you can go through
the procedures of implementing the additional functions of the
SPECIAL EDITION RDM-. Only the edditional functions will be
described in detail. The FUNCTION JOB TABLE on PAGES 26 to 20
will provide you with an overall picture of all the Functions of
the DX7.
Referring to FIGURE 3on the next page, the procedure fo-
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ttSIBUCXiPM-BUiJBS
initiating the FUNCTION MODE of the DX7 1* the
Remember, the FUNCTION MODE !• activated by pressing the FUNCTION
SWITCH to th. LEFT of th. ofLCD di-play, then BimCiTto
the desired FUNCTION by presslng th. appropriate MEMDRV SWITCH to
R1RHT of the LCD display. In al*o*t all
?”l2rrngri^tl?i.S“i~ F^T^PAR^^ ^««lt”.
EDITION RDM has a— MEMORY SNITCHES that »^Sr^MITW
PARAMETERS. Therefore ,when you pr«m« tho *MO*Yhi DATA
you can ell up anew FUNCTION PARAMETER. A* you knon the DATA
ENTRY SLIDER or DATA ENTRY SWITCHES are uaad to change tha
FUNCTION PARAMETERS.
B*tr_
TVe fcM»oAi p* %» -W7W>.
««.»r/n>*| <h» •'
/*. fwHwnf ./eiNNP-eh P*
VI «.** •*
«A««fc.rfNU «iO«* "
^E3t3
»-M* .r fc.fr rAe.ff. M*.«* FCPS'L3E3?.3i_3irl^'- >
•- -e* •** y/-%c- :*—j.*
—ew» <*'«. ^
FIGURE S
Before proceeding you should verify the present condition of
aach FUNCTION. Sometime* when aROM IC ia changed, tDfiv of tha
FUNCTIONS way ba inadvertentl y*et to iH*o*l or *nv*“°
condition*. Thi* ia th* raa*on for verifying tha coodi tiona of
aach FUNCTION. Therefore, go through each FUNCTION beginning
with tha MASTER TUNE FUNCTION and check tha LCD display. If the
di.pl ay do.* not indicate th. proper condition or ha* grange
character **hown in. tha display, .Imply "°v# ^h*. D^TA.F^T^N3plJM
control to MINIMUM, than to MAXIMUM and than back to th. MINIMUM
tptting to reset the FUNCTION. Once tha FUNCTION ha* bean reset
you may wish to »at it to tha condition that you require.
-0-