Yamaha DX7 MiniMAX Expansion Install

Transcription

1 Yamaha DX7 MiniMAX Expansin Install 1: Intrductin The DX7 MiniMAX a simple ptin bard that prvides increased memry and cntrl f the DX7. While the installatin is fairly simple, it still requires patience and general electrnics knwledge. We accept n respnsibility fr the wrk yu perfrm n yur DX7. Read ver the fllwing installatin descriptin and if yu feel yu are nt capable f the wrk required, turn the prject ver t a qualified technician Precautins! High Vltage Safety Warning Unplug the audi cable. Turn the DX7 pwer switch OFF and unplug it frm the wall. Discnnect any ther cnnected cables befre pening the DX7. ESD Precautins and Prper Handling Prcedures Yu shuld bserve standard static-safe handling behavir when wrking with sensitive electrnic equipment such as synthesizers: Avid carpets in cl, dry areas. Dissipate static electricity befre handling any system cmpnents by tuching a grunded metal bject. If pssible, use anti-static devices, such as wrist straps and flr mats. Take care when installing the bard. Prevent damage t the cnnectrs by aligning cnnectr pins befre yu apply pressure. A damaged pin can render the bard unusable and can cause damage t system cmpnents at pwer-n. If discnnecting a cable, always pull n the cable cnnectr, nt n the cable itself. Tls Required Standard Philips screwdriver. Standard flat-head screwdriver (small). Cnditin f DX7 While the DX7 MiniMAX will replace the functinality f damaged r missing EPROM and/r SRAM chips, it will nt crrect ther prblems yur vintage synthesizer may have. It is recmmended that the synth be in therwise gd cnditin befre beginning the installatin. Fr instance, the battery vltage shuld be checked and the battery replaced/repaired by a tech if necessary. Sckets fr the EPROM and SRAM chips shuld be in gd wrking rder and nt be DX7 MiniMAX Page 1 f 6 Install v2.10

2 dirty, xidized, rusted r therwise cmprmised. If repair is required, d it befre installing the DX7 MiniMAX. 2: Installatin Back up yur patches if they are imprtant t yu! Open the DX7 Using a Philips head screwdriver, remve the 5 screws frm the frnt panel. Tw are lcated n the left frnt. Tw are lcated n the right frnt. A final ne is lcated n the right rear. Set the screws aside, nting that the rear panel ne is the shrtest. (Re)Mve the Keybed & Remve the Keybard Rail It can be difficult t see the delicate pins when installing the DX7 MiniMAX bard. By mving the keybed (the chassis with the keys) and remving the silver keybard rail, yu will have better sight lines and freedm f mvement when installing the DX7 MiniMAX bard.. Remve the 4 large external screws frm the underside f the keybard alng the frnt edge. The pht belw shws the inside frnt edge f the empty case bttm and illustrates the lcatin f the 4 screws. Yu will, f curse, be unscrewing frm the DX7 underside. Lsen the 3 internal screws at the extreme right and left ends that hld the keybed in place. It is nt necessary t extract them frm the hles they reside in. DX7 MiniMAX Page 2 f 6 Install v2.10

3 Carefully lift the keybed slightly up and ut (tward yurself) an inch r s.. Yu dn't need t mve it much. Yu will prbably need t free up ne r mre cables t accmplish it. Or if yu prefer, discnnect the cables and cmpletely remve the keybed. This will give yu access t the 3 screws hlding the silver keybard rail in place. Remve thse three screws and set aside the silver keybard rail. (Shwn here with keybed remved). Yu nw have excellent access t the DX7 main bard. If yu d remve the keybed yu may find it easier t remve the small yellw cable and large flat grayish cable at the main-bard-end rather than frm the keybed. Yu will als need t unclip tw small cables n the left end (md wheel and pitch bend). There may als be wire tires and/r cable fasteners t deal with. Remve the EPROM and SRAM ICs The next step is t remve the EPROM and tw SRAM ICs. The EPROM is fund in lcatin IC14 and the tw M5M5118P SRAM chips (r similar) are lcated at IC21 and IC20. Remve them by prying slwly at each end f the chip back-and-frth with a small flat-head screwdriver. Avid tuching any f the metal pins with the screwdriver. DX7 MiniMAX Page 3 f 6 Install v2.10

4 Place them safely aside n anti-static fam. Yu can use the reverse side f the fam shipped with the DX7 MiniMAX. The pht abve shws the 3 chips remved. After remving the chips, als remve the screw shwn at the center f these phts near IC23. Install the DX7 MiniMAX Printed Circuit Bard Hand tighten the supplied nyln standff int the screw psitin near IC23. Tighten it well by hand, but there is generally n need t use a tl. D nt ver tighten r strip the threads. Remve the DX7 MiniMAX bard frm the anti-static fam. Inspect the bttm f the bard t make sure nne f the pins have been damaged. Yu shuld see ne cllectin f 28 pins (2 parallel strips f 14 pins), ne strip f 12 pins and a strip f 8 pins. DX7 MiniMAX Page 4 f 6 Install v2.10

5 Place the DX7 MiniMAX bard gently n the DX7 main bard s that the 28 pins that frm a DIP package align with the vacated IC14 spt. The 8 pins alng the edge shuld align with IC20 and the ther 12 pins shuld align with IC21. D nt press the bard in place yet. Yu can use a small mirrr t check the pin alignment. Once yu are happy that all the pins are aligning with the desired lcatins, firmly and evenly press the DX7 MiniMAX bard in place. Make a visual check t see that the bard is flush with the sckets. Using a screwdriver, carefully tighten the riginal main bard screw thrugh the DX7 MiniMAX bard int the nyln standff. Again d nt frce it r ver tighten as this can nt nly strip the standff, but it can cause the DX7MiniMAX bard t change psitin. It shuld be tight enugh s that it cannt wrk lse. Duble check the pins. Reassembly Remve all tls frm the DX7. Carefully reassemble the DX7 in the reverse rder, taking care t replace the crrect screws in the varius lcatins. If yu discnnected the green keybed grund strap wire dn't frget t screw it back in. DX7 MiniMAX Page 5 f 6 Install v2.10

6 Test Plug the AC cable in and turn it n. After a few mments, yu shuld get a greeting message like: Initializatin * Welcme t * * MiniMAX v2.1 * Since technically the battery has been remved, yu may find sme f the standard DX7 functin settings have been scrambled. Fllw the steps belw t put the DX7 int a knwn gd state befre lading yur patches back in. Functin settings n number 8 have been enhanced and new functins 12 and 13 have been added. 1. Press MEMORY PROTECT / INTERNAL then OFF. Internal memry prtect is nw ff. 2. Press FUNCTION and then buttn 12. Use the Data Slider t set the FUNCTION CONTROL Memry Bank t 1 (there are nly 4 RAM banks, numbered 1 t 4, regardless f what the initial LCD value says). 3. Press buttn 13 and set the FUNCTION CONTROL MIDI OUT= channel t yur preferred value frm 1 t 16 (usually 1). 4. Press buttn 8 repeatedly until yu see FUNCTION CONTROL MIDI IN= and set this channel t yur preferred value (1 t 16 r All which is OMNI mde). Check/set the standard DX7 Functin settings versus yur preferences. Yu shuld be able t lad sme patches nw, but it is still pssible that sme setting prevents the sund frm being heard. The patch data memry will certainly be garbled. Use the standard DX7 panel peratins t lad the current data bank with yur patches. The Yamaha DX7 MiniMAX User Guide will explain hw t select memry banks as well as hw t use the ther features f this expansin. Enjy yur updated DX7! See the MTG web site fr mre great vintage synth and drum machine gdies. DX7 MiniMAX Page 6 f 6 Install v2.10